I&I NSW Technical Reference Electrical Engineering Management Plan

Transcription

1 Technical Reference Electrical Engineering Safety EES-001 I&I NSW Technical Reference Electrical Engineering Management Plan Coal Mine Health and Safety Act 2002 Coal Mine Health and Safety Regulation 2006 Occupational Health and Safety Act 2000 Occupational Health and Safety Regulation 2001 July 2009 (version 2) Page 1 of 74

2 Disclaimer The compilation of information contained in this document relies upon material and data derived from a number of third party sources and is intended as a guide only in devising risk and safety management systems for the working of mines and is not designed to replace or be used instead of an appropriately designed safety management plan for each individual mine. Users should rely on their own advice, skills and Experience in applying risk and safety management systems in individual workplaces. Use of this document does not relieve the user (or a person on whose behalf it is used) of any obligation or duty that might arise under any legislation (including the Occupational Health & Safety Act 2000, any other Act containing requirements relating to mine safety and any regulations and rules under those Acts) covering the activities to which this document has been or is to be applied. The information in this document is provided voluntarily and for information purposes only. The New South Wales Government does not guarantee that the information is complete, current or correct and accepts no responsibility for unsuitable or inaccurate material that may be encountered. Unless otherwise stated, the authorised version of all reports, guides, data and other information should be sourced from official printed versions of the agency directly. Neither Industry and Investment NSW, the New South Wales Government, nor any employee or agent of the Department, nor any author of or contributor to this document produced by the Department shall be responsible or liable for any loss, damage, personal injury or death howsoever caused. Users should always verify historical material by making and relying upon their own separate inquiries prior to making any important decisions or taking any action on the basis of this information. This publication contains information regarding occupational health, safety, injury management or workers compensation. It includes some of your obligations under the various workers compensation and occupational health and safety legislation that Industry and Investment NSW administers. To ensure you comply with your legal obligations you must refer to the appropriate Legislation. This publication may refer to NSW Legislation that has been amended or repealed. When reading this publication you should always refer to the latest laws. Information on the latest laws can be checked at or contact (02) Page 2 of 74

3 PREFACE Electrical installations at mines are generally more complex than those found in most business and residential installations, also the mining industry is increasing consumption of electricity and its use of electrical technology with consequent increases in size (power rating) and complexity. With this comes a changing risk profile. To adequately manage the safety risks posed by electrical equipment and technology the hazards, risks and risk controls need to be thoroughly understood. This understanding must be at an engineering level hence mine Electrical Engineering Management Plan s are required to be designed, implemented and managed by a Manager of Electrical Engineering who is a qualified electrical engineer with relevant experience in the mining industry, the requirements as outlined below: For an underground mine it is expected the Manager of Electrical Engineering being a person who holds a certificate of competence to be a mine electrical engineer would be responsible for development, periodic review and day to day implementation of the Electrical Engineering Management Plan. For open cut and processing plant operations it is expected that a qualified electrical engineer being an electrical engineer with mining electrical engineering qualifications (Mine electrical engineers certificate of competence) or an electrical engineer with qualifications suitable for registration by the Institution of Engineers Australia will be responsible for the day to day implementation of the Electrical Engineering Management Plan. It is expected that these engineers would appear within the management structure required by the Coal Mine Health and Safety Act 2002 which requires the management structure to include competent people with appropriate electrical engineering competence and, specifically for underground mines, a competent person to perform the functions of the manager of electrical engineering.. It is expected that the management structure will clearly show that the Manager of electrical engineering (underground mine) or the qualified electrical engineer (open cut mine and/or processing plant) has a supervisory role over all persons involved in the selection and life cycle management of electrical powered plant and electrically controlled plant, including associated work practices. This managerial role should effectively supervise / oversee all decisions that can impact on electrical engineering safety at the operation, in particular those decisions made by other electrical engineers and electrical tradespeople doing work at or for the operation. This Technical Reference will be used by Mine Safety Operations to assess the effectiveness of coal operation Electrical Engineering Management Plans. This Technical Reference can also be used by coal operators as guidance to the content of an Electrical Engineering Management Plan. It also provides guidance on the electrical engineering content of the management structure for an operation. Use this Technical Reference to assess your Electrical Engineering Management Plan. John Francis Waudby Senior Inspector of Electrical Engineering Page 3 of 74

4 REVISIONS This is Version 2 of EES-001. This document has been revised as a result of changes to legislation applying to Coal Operations. In September 2008, the NSW Occupational Health and Safety Regulation 2001 were amended so that the whole of the regulation (with specific non-electrical matters exempted) applied to coal operations. Also the contents of EES-002 Control and Supervision of Electrical Work have been included. Editorial changes have also been made with the relevant legislation referenced (generally) at the beginning of each subsection and denoted by ACT or in the left hand margin. Information that can assist in interpretation and enhanced detail has been included at the end of each sub-section and is denoted by INFO in the left hand margin. Also provided as information are references to International Labour Office, Geneva, Draft code of practice on safety and health in underground coalmines, doc ref MESHCM/2006 this is indicated by ILO in the left hand margin, this applies to underground mines only. Refer to Appendix A for details of the changes. Page 4 of 74

5 CONTENTS PREFACE 3 REVISIONS 4 CONTENTS 5 Chapter 1 Establishment Title Purpose Scope Authority Definitions Applicable legislation Referenced Gazette Notices Referenced Standards and Guidelines Acronyms Other referenced legislation Who is affected by this Technical Reference? Electrical Installations Automotive Electrical Installations...13 Chapter 2 Health and Safety Management Systems and the Electrical Engineering Management Plan (EEMP) Introduction Occupational Health and Safety Management System...15 Chapter 3 Electrical Engineering Management Plan Objectives Management Structure Scope of an Electrical Engineering Management Plan Plant Safety Electrical Work and Practices Standards of Engineering Practice (SEP s) Compliance with AS/NZS 3000 and AS Electrical Plant used in Hazardous Zones Static Electricity Electrical Protection Earthing Switching Electrical Power Use of Portable Apparatus Specific Procedures Overhead Power Lines & Cables & underground (buried) cables Signage and Plans...46 Chapter 4 Electrical Engineering Management Plan, other management plans and regulatory requirements Relationship to other plans and requirements Electrical Engineering Management Plan and other management plans Electrical Engineering Management Plan and other coal mines regulations requirements Electrical Engineering Management Plan and OH&S regulations requirements Duties relating to contractors...55 Chapter 5 Maintenance of electrical installations & equipment...57 Chapter 6 Technical matters to consider for SEP s Control Circuits Electrical cord extension sets...60 Page 5 of 74

6 6.3 Safe access to electrical equipment Underground Installations...60 FEEDBACK SHEET...72 Chapter 7 I&I NSW Contact Details...74 Page 6 of 74

7 Chapter 1 Establishment 1.1 Title This is the DPI Electrical Engineering Safety Technical Reference Electrical Engineering Management Plan. 1.2 Purpose This Technical Reference is intended to provide a framework for DPI officers to assess coal operation Electrical Engineering Management Plans. It can also be used by coal operators as guidance material for implementing, managing or reviewing their Electrical Engineering Management Plan. This Technical Reference identifies issues required to be addressed to achieve safety measures equivalent or better than those expressed in electricity safety legislation. Some of the aspects included in this document may not be specifically nominated in the current climate of non-prescriptive legislation but are relevant and worthy of acceptance in an effort to protect people and property from harmful effects of electricity. This Technical Reference describes acceptable arrangements that can be tailored to suit the particular needs of an operation. It identifies some of the core hazards, risks and control measures relevant to electrical circuitry. It is intended to protect the safety of workers, others in the workplace and property. The outcomes sought to be achieved by this Technical Reference are to protect people and property from the hazards occurring during electrical equipment failures and include: Electrocution. Electric shock. Electrical burn injuries. Arc blast injuries. Injuries sustained through operation of the apparatus. Unintended operation of the apparatus. Ignitions of flammable mixtures of gas or dust. Fire 1.3 Scope This Technical Reference extends to all coal operations in New South Wales. The areas within a coal operation include general surface, treatment plants, underground outbye and underground hazardous zones. The Technical Reference deals with high voltage, low voltage, and extra low voltage equipment, it applies to mains supplied plant, privately owned generating plants, installations supplied by privately owned generating plant, self contained electrical apparatus and electric welding equipment (including the welding work circuit). This Technical Reference is supplemented by the following Technical References: Page 7 of 74

8 EES-003 NSW DPI Technical Reference - Practices for the Life-Cycle of Management of Explosion Protected Equipment EES-004 NSW DPI Technical Reference Practices for Portable Electrical Apparatus EES-005 NSW DPI Technical Reference - Electrical Protection and Earthing EES-006 NSW DPI Technical Reference - Removal and Restoration of Power 1.4 Authority This is an Electrical Engineering Safety Technical Reference and is recommended by Industry and Investment NSW. 1.5 Definitions Coal operation is defined in the Coal Mine Health and Safety Act 2002 and broadly includes underground mines, open cut mines, coal preparation plants and in some cases coal loading facilities. A document that specifies the boundaries of a coal operation should be referenced in the Electrical Engineering Management Plan. Competent person for any task means a person who has acquired through training, qualification, experience, or a combination of them, the knowledge and skills to carry out the task. Hostile operating environment means an operating environment at a place of work where an electrical article is in its normal use subjected to operating conditions that are likely to result in damage to the article and for example includes an operating environment that may: Cause mechanical damage to the article. Expose the article to moisture, heat, vibration, corrosive substances or dust that is likely to result in damage to the article. Employee means an individual who works under a contract of employment or apprenticeship. Employer means a person who employs persons under contracts of employment or apprenticeship. Note: in some chapters of the Regulation the term employer includes a selfemployed person in relation to duties to other persons. Manager of Electrical Engineering means a person listed in the management structure of an underground coal operation who is responsible for development, periodic review of, and review of the day to day effectiveness of the implementation of the Electrical Engineering Management Plan. Plant includes any machinery, equipment or appliance. Qualified Supervisor means an electrical tradesperson holding a Qualified Supervisor Certificate Electrical Work, issued by the Office of Fair Trading, that licenses the holder to supervise or carry out electrical wiring work without supervision. Residual current device (RCD) means a device to isolate supply to protected circuits, socket outlets or electrical equipment in the event of a current flow to earth which exceeds a predetermined value. The device should comply with AS/NZS3190 Voltage: Extra-low voltage Not exceeding 50 V a.c. or 120 V ripple free d.c. Page 8 of 74

9 Low voltage Exceeding extra-low voltage, but not exceeding 1000 V a.c. or 1500 V d.c. High voltage Exceeding low voltage. Information Note - For underground mining applications, voltages of 1000 V a.c. and 1100 V a.c. have been commonly used in a similar manner to voltages of 415 V a.c. and 550 V a.c. (low voltage). Previous legislation required that voltages exceeding 1200 V a.c. not be applied to certain types of apparatus (explosion protected, mobile, portable, or motors smaller than 15Kilowatts). From this there is a common and accepted practice of considering high voltage to be greater than 1200 V a.c. in underground mining applications and associated surface applications. Where a coal operation chooses to not use accepted (mining and non-mining industry) high voltage practices on circuits whose nominal voltage exceeds 1000 V and is less than 1200V, this must be supported by a risk assessment and nominated controls, including specific procedures to prevent electric shock, arcing and failure of explosion protection. Underground coal operations use mining machinery powered at 3.3 kv. High voltage practices and procedures must be used on these circuits, it is not acceptable to plug and unplug restrained plugs at 3.3kV, without effecting proper isolation. Proper isolation does not rely on a contactor as the sole power conductor opening device. For high voltage distribution systems a permit to work system must be used and records kept. 1.6 Applicable legislation The Occupational Health and Safety Act 2000 The Occupational Health and Safety Regulation 2001 The Coal Mine Health and Safety Act 2002 The Coal Mine Health and Safety Regulation Referenced Gazette Notices Gazette Notice for Retention of Notifications Gazette Notice for Specification of Plant that can be used in a Hazardous Zone Gazette Notice for the conditions of use of non-explosion protected plant in a hazardous zone Gazette Notice for considering certain workshops to be licensed Gazette Notice for the specification of requirements to be licensed as a cable repair workshop 1.8 Referenced Standards and Guidelines AS/NZS 1020 The control of undesirable static electricity AS Safety in welding and allied processes - Electrical AS/NZS 1802 Electric cables - Reeling and trailing - For underground coal mining purposes Page 9 of 74

10 AS/NZS 1972 Electric cables - Underground coal mines - Other than reeling and trailing cables AS/NZS : Electrical equipment for coal mines - Introduction and maintenance - For hazardous areas AS/NZS 2381 Series - Electrical equipment for explosive gas atmospheres - Selection, installation and maintenance AS/NZS 3000: Electrical installations (known as the Australian/New Zealand Wiring Rules) AS 3007 Series - Electrical installations - Surface mines and associated processing plant AS/NZS3019 Electrical installations - Periodic verification AS/NZS 3190: Approval and test specification - Residual current devices (current-operated earth-leakage devices) AS Series - Safety of machinery AS/NZS 4240 Remote controls for mining equipment AS 4242 Earth-moving machinery and ancillary equipment for use in mines - Electrical wiring systems at extra-low voltage AS/NZS 4761 Series - Competencies for working with electrical equipment for hazardous areas (EEHA) - Competency Standards AS/NZS 4801 Occupational health and safety management systems - Specification with guidance for use AS/NZS 4871 Series - Electrical equipment for coal mines, for use underground - General requirements AS Safety of machinery - Electrical equipment of machines AS Series - Functional safety of electrical/electronic/programmable electronic safety- related systems AS Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems Australian Standards Handbook, HB187 Guide to selecting a safe multimeter Australian Standards Handbook, HB , Handbook: High voltage mining equipment for use underground NSW Minerals Industry Safety Handbook EES-003 NSW DPI Technical Reference - Practices for the Life-Cycle of Management of Explosion Protected Equipment EES-004 NSW DPI Technical Reference - Practices for Portable Electrical Apparatus EES-005 NSW DPI Technical Reference - Electrical Protection and Earthing EES-006 NSW DPI Technical Reference - Removal and Restoration of Power MDG 15 Technical References for Mobile and Transportable Equipment for Use in Mines MDG 25 Guideline for Safe Cutting and Welding Operations at Mines MDG 40 Guideline for Hazardous Energy Control (Isolation or Treatment) Page 10 of 74

11 MDG 5002 Guideline for the use of remote controlled mining equipment Underground metalliferous mines. ILO MESHCM/2006 Draft code of practice on safety and health in underground coalmines WTIA TN 7-98 Health and Safety in Welding Workcover Code of Practice for Overhead Power Lines. 1.9 Acronyms AS Australian Standard AS/NZS Australian New Zealand Standard CMHS Coal Mine Health and Safety CMHSA Coal Mine Health and Safety Act 2002 CMHSR Coal Mine Health and Safety Regulation 2006 ECSA Electrical (Consumer Safety) Act 2004 EEMP Electrical Engineering Management Plan ELV Extra Low Voltage EPL Explosion protection level (refer AS/NZS ) Ex Explosion protected IEC International Electrotechnical Commission ILO International Labour Office MEMMES Mining Electrical & Mining Mechanical Engineers Society (Engineers Australia) NECA National Electrical and Communications Association of Australia OH&S Occupational Health and Safety OHSR Occupational Health and Safety Regulation 2001 (as amended) SEP Standard of Engineering Practice SIL Safety Integrity Level WTIA Welding Technology Institute of Australia 1.10 Other referenced legislation The Electricity (Consumer Safety) Act 2004 The Home Building Act ELECTRICITY SAFETY LEGISLATION The industries that provide electricity, construct and maintain the equipment that conveys electricity and supply electrical articles are highly regulated in Australia and around the world because of the potential for electricity to injure and kill people and to destroy property. The legislation that regulates electricity safety in NSW, the Electricity (Consumer Safety) Act 2004, is administered by the Minister for Fair Trading. Page 11 of 74

12 The Electricity (Consumer Safety) Act 2004 meets its consumer protection objectives by requiring, encouraging and promoting the supply of safe electrical articles (consumer appliances) and safe practices for electrical wiring work. It aims to do this in all situations whether at home or in commercial, industrial or agricultural environments. Electrical installations at mines are excluded from the application of the Electricity (Consumer Safety) Act The approach taken by mining industry regulators is based on a requirement for Mine Safety Management Plans to incorporate an Electrical Engineering Management Plan (EEMP) that provide for an equivalent or better safety outcome. The EEMP should specify risk controls that meet the objectives and targets for electrical engineering safety set by Industry and Investment NSW and meet the expectations of legislation and are consistent with non-mining workplaces and guidance material provided by Industry and Investment NSW Who is affected by this Technical Reference? All operators of coal operations in New South Wales where there is an electrical installation that is connected to the network of an electricity supply authority or where there is an electrical installation with the source of electricity is a stand-alone power system such as photovoltaic cells (solar panels), wind or water turbines, diesel or petrol generators. All individuals, unincorporated businesses and corporations involved in utilizing electricity at NSW coal operations including those who design, install and implement electrical safety systems and those who commission, test, operate and maintain the systems Electrical Installations OHSR, Clause, 33(1) Definition electrical installation For the purposes of this technical reference, the following definition of an electrical installation is designed to remain consistent with the Electricity (Consumer Safety) Act 2004 and includes coal mines. For the purposes of this Technical Reference an electrical installation 1 is the fixed electrical wiring and associated equipment in a place that conveys, controls or uses electricity, at low voltage or above, from a source of electricity to the points where the wiring terminates. It also includes the electrical wiring and associated equipment utilizing trailing cables, reeling cables and flexible feeder cables. All intrinsically safe equipment and circuits normally supplied via the mains is considered to be part of an electrical installation. Electrical installations can be indoors, outside, above or below ground. The source of electricity may be either the transmission or distribution lines of a distribution network service provider or a stand-alone power system (which falls within the ambit of AS 4509) which is owned or operated by the user of an installation. An electrical installation commences at the end of the network operator s electricity distribution line. In the case of an electrical installation connected to the grid this will be the point of supply as determined by the local electricity supply authority 2. When an electrical installation has a stand-alone power system as its sole source of electricity the electrical installation commences at the system output terminals. This 1 The term electrical installation is defined in the Electricity (Consumer Safety) Act For more information refer to the network operators Standard Form of Customer Connection Contract Page 12 of 74

13 Technical Reference also applies to the generating equipment, even though it is not part of the defiined electrical installation. Termination points of an electrical installation include power points (electrical socket outlets) into which electrical articles can be plugged, and the termination of electrical wiring to which electrical articles can be fixed, whether permanently or temporarily Automotive Electrical Installations Automotive wiring systems and equipment on vehicles and other mining machinery is not considered as an electrical installation, however it is expected that the life-cycle management of such wiring and systems is addressed in the coal operation EEMP and that persons working on such wiring systems and equipment are deemed competent to do so. Page 13 of 74

14 Chapter 2 Health and Safety Management Systems and the Electrical Engineering Management Plan (EEMP) 2.1 Introduction ACT CMHS Act, Section 23(3) (e) Contents of health and safety management system. CMHSR, Clause 13(1) (e) Additional components of health and safety management system OHSR, Clause 41(1) (a) Electricity particular risk control measures OHSR, Clause 41(1) (2) Electricity particular risk control measures OHSR, Clause 64(1) Electricity particular risk control measures Electrical Engineering decisions are critical to attaining safe production at mine sites. To achieve safety these decisions must be of the highest quality. A model for making these quality decisions is the Minerals Industry Risk Management Model (MIRM Model). MIRM has two main elements: these are the management system and the work process factors. The management system incorporates the management and electrical engineering framework for the design and operation of the site. The electrical engineering framework is the legislative requirement for an EEMP. As such it supplies the inputs to the daily work processes to achieve safe production within a controlled work environment by competent people, fit for purpose equipment and safe work practices. This is expressed in the diagram below (refer: Engineering & Management Framework The quality of the decision depends on the quality of the engineering and management process that designs, purchases, installs, commissions, operates, maintains (including repair and overhaul), modifies, trains, standardizes and otherwise defines the nature of the day-today work process. To do this the management system has to be defined and formally documented so that the quality of key decisions is not left to chance. (Refer to Page 14 of 74

15 Australian/New Zealand Standard AS/NZS 4801:2001 Occupational health and safety management systems specification with guidance for use) All of the above must be present and effective at every stage of the equipment and mines life cycle and must be effectively supported by the organisational culture. If any element is deficient or there is ineffective support from the organisational culture safe production is left to chance. The EEMP is an element of the Health and Safety Management System and must be developed, implemented and periodically reviewed through consultation with a qualified electrical engineer, and for underground mines the Manager of electrical Engineering. The key point is that the EEMP should clearly establish links to the Health and Safety Management System, other mandatory management plans and business management systems and vice-versa. 2.2 Occupational Health and Safety Management System The Occupational Health and Safety Management System must be consistent with AS AS 4801 POLICY Health and Safety Management System Leadership and Commitment The Health and Safety Management System should clearly establish leadership and commitment to Electrical Engineering Safety through the EEMP AS 4801 PLANNING Health and Safety Management System Planning Identification of Hazards, Risk Assessment and Control of Risks OHSR, Clause 9 Employer to identify hazards OHSR, Clause 10 Employer to assess risks CMHSR, Clause 13(e) (v) Additional components of health and safety management system electrical engineering management plan electrical safeguards for electrical and nonelectrical hazards These requirements should be specifically addressed for Electrical Engineering Safety matters. The OHSR requires hazards relating to a number of elements for Electrical Engineering Safety to be identified, and the risks from those hazards assessed. The legislation also specifies certain electrical engineering safety risk controls to be implemented and in certain circumstances the use of a functional safety approach. Also refer to section ILO MESHCM/2006 Section 5.1 Hazards and health, p16-17 ILO MESHCM/2006 Section 18.1 Electricity, Hazards description, p Health and Safety Management System Legal and other Requirements These requirements should be specifically addressed for Electrical Engineering Safety matters. Non-Electrical Engineering Safety matters should encompass people doing electrical work, for example hazardous substances. This may require specific elements to be integrated in the EEMP or require specific electrical input via the Health and Safety Page 15 of 74

16 Management System e.g. hazardous substances such as asbestos or PCB s may only be encountered when doing electrical work, as such the most appropriate place to address this aspect is within the EEMP Health and Safety Management System Objectives and targets Electrical Engineering Safety objectives are specified in the legislation. These objectives must be addressed in the EEMP and referenced in the Health and Safety Management System. Specific targets should be nominated for each of the objectives Health and Safety Management System Management Plans CMHSR, Clause 13(1) (e) Additional components of health and safety management system An EEMP must be developed, implemented and maintained. The EEMP is a plan within the Health and Safety Management System and must be developed, implemented and periodically reviewed in consultation with a qualified electrical engineer. For an underground mine it is expected that the Manager of Electrical Engineering would be responsible for development, periodic review and day to day implementation of the EEMP. For open cut and processing plant operations it is expected that an electrical engineer with a coal mine electrical engineer certificate of competence or qualifications suitable for registration by the Institution of Engineers Australia would be responsible for development, periodic review and day to day implementation. The duties of the person appointed to the specified function of a qualified electrical engineer should make provision for overall supervision of standards for the installation, commissioning, maintenance and repair of electrical plant and installations and overall supervision of all electrical engineers and/or qualified tradespersons at the mine to ensure safety of the electrical installation and plant AS 4801 IMPLEMENTATION Health and Safety Management System Structure and Responsibility - Resources These requirements should be specifically addressed for Electrical Engineering Safety matters within the Health and Safety Management System and they must be sufficient to give effect to the EEMP. Each operation should have a documented management structure detailing positions, incumbents, responsibility and accountability for all of the elements of the EEMP. Purchasing and hiring of electrical equipment is a particularly important issue. The Health and Safety Management System must make provision for electrical equipment only being acquired after consultation with the qualified electrical engineer. Purchasing and hiring of equipment with electrical components is generally done by nonelectrical people. The Health and Safety Management System through the EEMP must consider electrical engineering aspects at the specification phase and be part of the EEMP. Where equipment is acquired that has electrical components for power, control or provision of safeguards then processes requiring review and acceptance (sign off) by a qualified electrical engineer must be used. ILO MESHCM/2006 Section (a) Electricity Hazard control General provisions appointment and resourcing for electrical work, p121 Page 16 of 74

17 ACT Health and Safety Management System Structure and Responsibility - Responsibility and Accountability CMHS Act, Section 37(4) & (5) Operator must prepare management structure CMHSR, Clause 44 Contents of management structure For an underground mine, the Manager of Electrical Engineering is responsible for the development, periodic review of, and review of the day to day effectiveness of the implementation of, the EEMP. For open cut and processing plant operations, an electrical engineer with a coal mine electrical engineer s Certificate of Competence, or registered on the National Professional Engineers Register (administered by Engineers Australia) would be responsible for the development, periodic review of, and review of the day to day effectiveness of the implementation of, the EEMP. These persons should be the nominated management representative with defined roles, responsibility and authority for ensuring the EEMP is established, implemented and maintained and shall have responsibility for reporting on performance. The EEMP should identify the types of electrical work at the coal operation for which an electrical worker must be authorised and appointed. In each case the EEMP should specify the minimum qualification, skills and experience that would be required to enable a person to do the work safely. AS 3007 refers to ordinary persons, instructed persons and skilled persons and requires that these persons can only have access to electrical installations that are appropriate for their level of knowledge and experience appointments and authorizations should reflect this. The CMHSR clause relating to Appointment of People does not specifically require the assessing and recording of the competence of electrical persons however it would be prudent to implement these requirements for electrical persons Health and Safety Management System Structure and Responsibility - Training and competency OHSR, Clause 41(1)(c) Electricity particular risk control measures CMHSR, Clause 19(1)(a) Electrical engineering management plan The EEMP shall identify the training needs for Electrical Engineering Safety matters to be addressed within the Health and Safety Management System. The regulation is quite specific about requirements for electrical work. The EEMP must make provision for the installation, commissioning, maintenance and repair of electrical plant and installations being undertaken only by a qualified electrical engineer or qualified tradesperson or people under the supervision of a qualified electrical engineer or qualified tradesperson. Further, the OHS Regulation is specific about requirements for training of persons entering an area in which electrical installations are located. The EEMP should include measures for establishing competencies for electrical work. Competencies are regarded as qualifications, skills and experience. Levels of supervision may vary according to the complexity of the task, the level of risk associated with a task and the levels of competency (qualification, skill or experience) of the person doing the work. The EEMP should include measures to ensure that apprentices and trainees are supervised and only perform activities assigned to their current competence level. The EEMP encompasses ALL electrical equipment installed and used at a coal operation that is under the control of Page 17 of 74

18 the coal operator. The EEMP should specify types of work where specific training and instruction is required, for example High Voltage work. For underground mines this would incorporate the National Competency Standards for working on hazardous area equipment (Refer to AS/NZS 4761) ILO MESHCM/2009 Section (e), p120 specify training, qualification and experience of electrical workers Health and Safety Management System Consultation, Communication and Reporting The Health and Safety Management System shall provide for Electrical Engineering Safety matters to be addressed. This may be via EEMP specific requirements. It is expected that significant consultation will be required as part of the EEMP in particular in relation to electrical work and where actions by non-electrical people such as mining engineers, mechanical engineers and purchasing officers can influence the acquisition of fit for purpose equipment electrical engineering aspects of equipment acquisition must be considered at the specification phase and be part of the EEMP. Consultation must occur when: Changes that may affect health, safety or welfare are proposed to the: - Work premises - Systems or methods of work - Plant or substances used for work Assessing the risks to health and safety arising from work Decisions are made about the measures to be taken to eliminate or control those risks Introducing or altering the procedures for monitoring risks Decisions are made about the adequacy of facilities for employee welfare Decisions are made about the procedures for consultation Note 1: For more details about the obligations to consult refer to the Workcover Guideline: Occupational Health and Safety Consultation. Note 2: Electrical Engineering Safety must be a specified element within the above points Health and Safety Management System Documentation The EEMP shall provide specific Electrical Engineering Safety content. The regulation has specific requirements that must be addressed Health and Safety Management System Document and Data Control OHSR, Clause 41(5) Electricity particular risk control measures It is expected that all documents and data requirements within the EEMP will utilise the Health and Safety Management System documentation and data control system. It is important to ensure that changes to any electrical circuit are documented and managed under the management system s document control arrangements. If this is not done there is often an increase in risk to persons fault finding on electrical equipment and installations, all energy sources may not be identified and experience has shown that circuits can remain energised and be a source of electric shock to unsuspecting mine workers. With the use of software based control of machinery, comes the need to control the software versions and any changes to code. Software management for safety related applications Page 18 of 74

19 should be managed within the document control system or as a specific program within the Electrical Engineering Management Plan Health and Safety Management System Hazard Identification, Risk Assessment and Control of Risks OHSR, Clause 9 Employer to identify hazards OHSR, Clause 10 Employer to assess risks CMHSR, Clause 13(e) (v) Additional components of health and safety management system electrical engineering management plan electrical safeguards for electrical and non-electrical hazards The EEMP shall provide specific Electrical Engineering Safety content. In addition to this general requirement for hazard identification and risk assessment, electrical safeguards for electrical and non-electrical hazards need to be subject to the functional safety method of establishing appropriate safety integrity levels (SIL) or equivalent (categories as used in AS4024). These functional safety requirements for electrical safeguards should be specifically addressed either in the Health and Safety Management System or the EEMP. The method of establishing appropriate SIL s or Categories for electrical safeguards should be specifically addressed either in the Health and Safety Management System or the EEMP. The EEMP should include provisions to ensure purchasing arrangements require the design of safety related parts and functions for plant to conform to a Safety Requirements Specification, which includes SIL or Category classification Health and Safety Management System Emergency Preparedness and Response The EEMP shall provide specific Electrical Engineering Safety content and shall cover the treatment of electric shock victims, the treatment of electrical burns, responses as a result of an electrical fire and electrical related responses to other emergency situations e.g. mine winders, explosions, machinery accidents etc. Liaison with electricity network providers will be an important element. The legislation is quite specific in the particular Electrical Engineering Safety matters that have to be addressed in the event of an emergency or similar situation AS 4801 MEASUREMENT AND EVALUATION Health and Safety Management System General The EEMP shall address calibrating, maintaining and storing of equipment used to monitor or measure effectiveness of risk controls related to Electrical Engineering Safety. Procedures developed for monitoring of performance, effectiveness and conformance to requirements of the EEMP shall be part of the Health and Safety Management System or referenced in the Health and Safety Management System as part of the EEMP Health and Safety Management System Incident Investigation, Corrective and Preventative Action OHSR, Clause 64(a4) Electricity particular risk control measures - Electrical installations and articles found to be unsafe Page 19 of 74

20 The EEMP shall provide specific Electrical Engineering Safety input to the Health and Safety Management System. In addition the OHSR requires specific actions for unsafe electrical equipment Records and records management OHSR, Clause 65 Maintenance of records - electricity CMHSR, Clause 19(1) (r) (ii) Electrical engineering management plan The EEMP shall provide specific Electrical Engineering Safety input to the Health and Safety Management System. The legislation specifies particular records to be kept with regard to electrical installations. This process is similar to the requirements for the non-mining industry. The process has to comply with section 6 of AS/NZS 3000: 2000 Electrical Installation. N.B. Operations should be considering reference to AS/NZS 3000:2007 instead of AS/NZS 3000:2000 if the requirements of the AS/NZS 3000:2007 provide for a higher level of safety Records are to be kept for the life of the installation. An EEMP should specify the form to be used for reporting safety and compliance tests. INFO Gazette Notice for Retention of Notifications INFO There are no specified notification forms gazetted at this time Health and Safety Management System Audit The EEMP shall be part of the audit program AS 4801 MANAGEMENT REVIEW The EEMP shall be part of the management review program. Development, implementation and periodic review shall be done through consultation with the qualified electrical engineer. Page 20 of 74

21 Chapter 3 Electrical Engineering Management Plan 3.1 Objectives CMHSR, Clause 13(e) Additional components of health and safety management system electrical engineering management plan A document that specifies the boundaries of a coal operation should be referenced in the EEMP. The purpose of the EEMP is to give effect to the Health and Safety Management System with regard to the following objectives: To prevent injury to people from sources of electrical energy. To prevent uncontrolled fires where electrical energy is the ignition source. To prevent initiation of gas or coal dust explosions by electrical energy. To prevent unintended operation of plant. To provide electrical safeguards for electrical and non-electrical hazards with an appropriate safety integrity level. (Note: The legislation does not use the term safety integrity level) To generally provide the means by which the safety of electrical plant is managed including requirements of the Act and this Regulation and relevant plant safety requirements under the Occupational Health and Safety Regulation With regard to electrical safeguards, the OHSR has particular requirements. OHSR, Clause 92(1) & (2) Emergency stops and warning devices particular risk control measures Emergency stop devices are required to be designed so that they are not affected by electrical or electronic circuit malfunction. A systematic functional safety approach that identifies the amount of risk control required to be delivered by the emergency stop and assignment of appropriate SIL (or Category as per AS4024.1) to deliver that risk control, may bring the risk of malfunction to a level that is ALARP. The EEMP must also encompass the life cycle of electrical plant and installations and electrical engineering practices at the coal operation. It is expected the EEMP would be fully integrated with the Health and Safety Management System and utilise the processes and procedures within that system. It is also expected that the EEMP will provide inputs to or provide for elements of other management plan requirements and non-clause 19 matters. Some systems will already be implemented at mines such as maintenance management systems. The EEMP should provide input into the maintenance management system and utilise the system elements such as work orders, defect reporting and management. How this is achieved is mine specific and is likely to vary from site to site. The key point is that the EEMP should clearly establish links to the Health and Safety Management System, other mandatory management plans and business management systems and vice-versa. 3.2 Management Structure CMHSR, Clause 44 Contents of management structure Page 21 of 74

22 The Coal Mine Health and Safety Regulation 2006 require competent electrical engineers to be nominated in the management structure. The management structure for a coal operation must relate to the EEMP and identify competent engineers to give effect to the EEMP. Where the coal operation has underground hazardous areas, the EEMP should assign specific competency requirements for persons involved in supervision, installation, use and maintenance of electrical explosion protected equipment. Each operation should have a documented management structure detailing positions,, responsibility and accountability for all of the elements of the EEMP. The name of a person filling a position in the management structure must be contained in a register kept at the mine. For an underground mine it is expected the Manager of Electrical Engineering would be responsible for development, periodic review and day to day implementation of the EEMP. For open cut and processing plant operations it is expected that an electrical engineer with qualifications suitable for registration by the Institution of Engineers Australia, or an electrical engineer that has a NSW Mines Electrical Engineers Certificate of Competence, would be responsible for day to day implementation. INFO Guidance Note GN-002 NSW DPI Guidance Note on Management Structure 3.3 Scope of an Electrical Engineering Management Plan This includes both regulatory (mandatory) requirements and other matters that should be included. The mandatory requirements are specified in the regulations, primarily under clauses 13 and 19, however other mandatory requirements are found in other more general clauses and in the Occupational health and Safety Regulation The requirements are grouped into categories that do not necessarily follow the numbering of the clauses and subclauses. The Occupational Health and Safety Regulation have specific electrical requirements in: Part 4.2 Work premises, Division 3 Electricity, clauses 40 and 41 Part 4.3 Use of places of work, Division 8 Electricity, clauses 63, 64 and 65 Part 7.7 Electrical work, clauses 205, 206, 207 and 208 The definition of an electrical installation is the same as in the Electricity (Consumer Safety) Act. With the addition that it includes electrical equipment at a coal operation. A particularly important part of the OH&S Regulation is Chapter 5, Plant Safety. All electrical equipment is covered by these requirements. For this reason EEMP requirements outlined below start with Plant Safety. Particular electrical details of the plant safety requirements are included in each of the requirements. ILO MESHCM/2006 Section (c) A list of coal face equipment to be kept, including that not in use. 3.4 Plant Safety OHSR, Chapter 5 Plant safety Chapter 5 of the OH&S Regulation has extensive requirements for plant safety. This applies to ALL plant (equipment, apparatus, tools, machinery etc). It requires a life-cycle approach to Page 22 of 74

23 ILO the safety of plant. Responsibilities of persons dealing with any aspect of plant are prescribed. Information flow for life-cycle management of the safety is important. Certain plant must be registered. All electrical powered equipment and electrically controlled equipment is covered by these requirements and they need to be integrated within the EEMP. The EEMP will need to have arrangements whereby checks are made to establish that designers, suppliers, manufacturers, trade agents and hirers of plant have fulfilled their obligations. Also, the coal operator needs to be sure that their obligations have been fulfilled, such as a coal operator who contracts out the design of plant must ensure that the person who is engaged to design the plant is provided with all relevant information about matters relating to the plant that may affect health and safety. All people and organisations in the supply chain have responsibilities. An end user should be able to establish that any foreseeable hazards that may arise during the life-cycle have been identified, risks assessed, risks eliminated or controlled, information has been provided and plant is not used in conditions likely to give rise to electrical hazards. This extends to ALL types of plant. For example a designer of an electrical control system for a processing plant is required to comply with these requirements in relation to the control system and the equipment being controlled as far as it can be affected by the control system. MESHCM/2006 Section 19.3 Machinery and plant (equipment) Underground face equipment, and continuous mining and coal-cutting machines Explosion protection, installation of methane monitors, light and remote control, p INFORMATION RELATING TO PLANT SAFETY The information must be able to establish full compliance with legislation. As such Chapter 5 of the OH&S Regulation must be extensively referenced in plant specifications, SEP s and checklists used within the auspices of the EEMP. The information must encompass: All available information concerning health and safety about the plant provided by the manufacturer. The purpose for which the plant is designed. Testing or inspections to be carried out on the plan. Installation, commissioning, operation, maintenance, inspection, cleaning, transport, storage and, if the plant is capable of being dismantled, dismantling of the plant. Systems of work necessary for the safe use of the plant. Knowledge, training or skill necessary for persons undertaking inspection and testing of the plant. Emergency procedures. Any document relating to the testing and inspection of the plant. Each operation should have certain equipment dossiers or safety files including: HV Installation Dossier. Hazardous Area Equipment Dossiers. Underground Mobile Apparatus Dossiers. Mine Winding System Dossiers (Safety File). Radio Controlled Equipment Dossier (This to include operating frequencies, control of surface operations, testing of transmitters). Safety File for any apparatus identified as requiring a SIL. Page 23 of 74

24 Mining machinery is becoming more complex and the use of programmable systems is common place. With this type of machinery come more detailed information requirements. For this type of plant information is required on: Compliance with AS/NZS4024, AS 61508, AS Programmable Electronic Devices - Security/Access, Change Management, Routine verification, SIL levels. Other particular matters are information, documentation, drawings, plans and records of fixed gas monitoring plant or items and fixed gas drainage plant PLANT ISTRATION There are plant registration requirements in the OH&S Regulation including specific requirements for coal mines. The EEMP must encompass this and regularly review whether plant is registered, remains registered or if there are special conditions of use as a result of registration. With regard to plant with electrical elements the following have to be registered Portable gas detectors, Powered winding systems, Shotfiring equipment, Other matters with an electrical content, o Booster fans, o Refuge Chambers. ILO MESHCM/2006 Section 8.3, Hoisting installations at shafts and unwalkable outlets, p38-41 ILO ILO MESHCM/2006 Section 8.14, Signalling appliances, p46 MESHCM/2006 Section 8.17, Automatic elevators, p SPECIFIC PLANT REQUIREMENTS OHSR, Clause 64(2) (b) Electricity particular risk control measures CMHSR, Clause 76 Plant requirements Electrical plant needs to be properly rated for its environment and other types of plant interacting with electrical installations must be used in a manner such that electrical hazards are managed properly. The CMHSR provides for the gazetting of requirements for mobile plant, remote controlled plant and fixed gas monitoring plant. The requirements can encompass design, certification, performance, assessment or installation requirements. These requirements must be met before the plant is used. The EEMP shall provide a system for supervision of radio control and software controlled plant on the site irrespective of ownership of the plant. The system shall provide measures to prevent unintended operation or inability to stop resulting from software changes or radio system interference. INFO For electrically powered mobile plant used underground - AS/NZS 4871, Parts 1, 4 & 5 Electrical equipment for coal mines, for use underground ILO MESHCM/2006 Section Conveyors, p62-64 INFO For mobile plant used on the surface of mines: AS Safety of machinery - Electrical equipment of machines AS 3007 Electrical installations - Surface mines and associated processing plant Page 24 of 74

25 AS 4242 Earth-moving machinery and ancillary equipment for use in mines - Electrical wiring systems at extra-low voltage MDG15 Guidelines for Mobile and Transportable Equipment for Use in Mines INFO For remote controlled mining equipment: AS/NZS 4240 Remote controls for mining equipment MDG5002 gives advice on the use of remote controlled mining equipment. ILO MESHCM/2006 Section Machinery and plant (equipment) Underground face equipment, and continuous mining and coal-cutting machines Remote control, p Electrical Work and Practices BASIC REQUIREMENTS ILO This clause sets out the basic requirements in relation to electrical installation work. The reason for these requirements is to apply uniform requirements for electrical work to mines in the same way as they are applied in other industries. The particular requirements can be found in Section 14 of the Home Building Act 1989 and the Electricity (Consumer Safety) Act All electrical installation work on the surface of a coal operation must be done in accordance AS/NZS An electrical installation must not be energised (i.e. connected to a distribution system or a stand-alone power system) unless the electrical installation work has been tested and found to comply with AS/NZS In the case of a free-standing electrical installation the stand-alone power systems to which it is connected must comply with AS 4509:1999, the Australian Standard for stand-alone power systems. If electrical installation work will result in the need for customer connection services the relevant distribution network service provider must confirm that the network has the capacity to supply the required electricity before commencing the work. In other words, if intended electrical wiring work will: Require the services of an accredited service provider to connect an electrical installation to the distribution network; Increase the maximum amount of electricity an existing electrical installation is able to draw from the distribution network; or Require the local distribution system to be upgraded Then it must be confirmed that the local electricity network can meet the demand for electricity before the work is undertaken. Many electrical workers who are authorised to work on or near the electricity network, known as Accredited Service Providers, have permission to perform connection work within certain parameters without first having to check with the relevant distribution network service provider. Utilising the services of such an Accredited Service Providers will meet these requirements. For electrical installation work in an underground operation, this must be done in accordance with the Coal Health and Safety Regulation 2006, the EEMP, Standards Of Engineering Practice and be consistent with AS/NZ S3000. MESHCM/2006 Section 18.5 Electricity Operating regulations, p124 Page 25 of 74

26 3.5.2 QUALIFICATIONS & SUPERVISION FOR ELECTRICAL WORK CMHSR, Clause 19(1) (a) Electrical engineering management plan CMHSR, Clause 162(2) Functions of a qualified electrical engineer and a qualified electrical tradesperson All electrical work related to installation, commissioning maintenance and repair can only be undertaken by qualified electrical people or under the direct supervision of a qualified electrical person. Qualified electrical people are a qualified electrical engineer or a qualified tradesperson as defined in the legislation. The accepted qualification for working unsupervised on an electrical installation in NSW is a Qualified Supervisor s License. In coal operations the qualifications are: Qualified electrical engineer (Mine electrical engineers certificate of competency or a registered professional electrical engineer) Qualified electrical tradesperson (Qualified Supervisor s certificate or two years work as an electrical tradesperson at a coal mine prior to 23 December 2008) Work under supervision should only be done by electrical people who have, as a minimum, a trade certificate in an electrical trade. Competence also incorporates experience; the EEMP should specify minimum experience for electrical workers for various types of work to allow that work to be undertaken without supervision. Where the installation includes Hazardous areas and the use of explosion protected electrical plant, the electrical worker will also need competence in the installation and maintenance of such equipment. The hazardous area units of competency are described in AS/NZS INFO An electrical tradesperson who has been employed at a mine for not less than two years. The two years must have been achieved doing electrical work as an electrical tradesperson. Work undertaken as an apprentice is NOT included. The two years can be at a number of different mines. Where the experience is at a number of different mines, evidence of competence via an electrical work practice report should be able to verify that two years of electrical work has been undertaken, or a letter from a mining operation representative that attests to the doing of two years electrical work. The two years must be prior to 23 December INFO For an electrical apprentice completing an apprenticeship and becoming an electrical tradesperson, appropriate supervision must be exercised until they have attained the status of qualified electrical tradesperson. INFO The clause relating to Appointment of People does not specifically require the assessing and recordings of the competence of electrical persons however it would be prudent to implement these requirements for electrical persons Supervision An EEMP should specify the supervision arrangements for electrical work. In all cases some level of oversight shall be conducted by an electrical engineer nominated in the management structure. For other than coal operations with a small electrical infrastructure this should be on a day to day basis. Page 26 of 74

27 Examples where additional supervision may be necessary include: In some cases electrical work may be performed by electrical workers who are not able to take responsibility for the work they are called upon to do. This may be due to persons not yet being competent, not being sufficiently trained or not being licensed for the work, for example trainees, apprentices or trades assistants In other cases the work may have additional complexity or additional risk warranting additional supervision to be provided Generally, supervision can be described as Direct and General. Direct supervision is where a person is under the immediate control and direction of the supervisor of electrical work who must be in attendance at all times. General supervision is where the supervisor of electrical work does not have to be in attendance all the time but exercises control and direction that ensures the person can carry out the work required. The degree of supervision applied in a given situation must be sufficient to ensure that: The work is carried out in a competent manner Appropriate safety measures are demonstrated and adopted while the work is being undertaken Sufficient competent assistance is readily available to enable the work to be safely carried out The completed work complies with relevant legislation, codes and guidelines Work under the supervision of a qualified electrical engineer Traditionally, coal mining legislation has provided that a person who was the holder of a trade certificate could be appointed as an electrician at a mine. Regulations in the past have also specified experience and supervision requirements. Regulations also vested general day to day control of electrical work in the Mine Electrical Engineer. This day to day control involved electrical people reporting directly to the Mine Electrical Engineer. Where electrical work is performed by employees at an operation and those individuals are not holders of a qualified supervisor s license then the work should fall under the general supervision of a qualified Electrical Engineer nominated in the coal operation management structure and in the case of an underground coal operation the Manager of Electrical Engineering. This general supervision would involve allocation of tasks & resources to the electrical tradesperson and the electrical tradesperson reporting directly to the qualified electrical engineer Work under the supervision of an electrical engineer in the management structure (who is not a qualified electrical engineer) For an underground operation it is expected that this electrical engineer reports to the Manager of Electrical Engineering. For surface operations this electrical engineer would not be able to fulfill the role of the qualified engineer It is expected that electrical engineers employed at operations have qualifications that would allow registration on one of the engineers registers operated by the Institution of Engineers Australia and would have a qualified supervisor s certificate, or in lieu of the qualified supervisor s certificate have had two years experience at a mine working as an electrical tradesperson. It should be noted that if a person is nominated as a competent electrical Page 27 of 74

28 engineer and is not a qualified electrical engineer and is not a qualified tradesperson then they can not do or supervise electrical work. Where electrical work is performed by employees at an operation and those individuals are not holders of a qualified supervisor s license then the work should fall under general supervision of an Electrical Engineer (who is also a qualified tradesperson) nominated in the coal operation management structure. This general supervision would involve allocation of tasks & resources to the electrical tradesperson and the electrical tradesperson reporting directly to the qualified electrical engineer. Further the electrical engineers activities should be reviewed on a regular basis by the qualified electrical engineer Work under the supervision of a qualified electrical tradesperson Where work is being done in this manner, the supervision shall be direct supervision. Any compliance testing and reporting must be done by the qualified electrical tradesperson Work where the coal operation is a surface operation and the electrical infrastructure is small A small electrical infrastructure is one with a connected load not exceeding 1MWatt. Some surface coal operations may only have a small electrical infrastructure, such as offices, amenities and workshops. If a risk assessment by the coal operator determines that the presence, on a day to day basis, of the electrical engineer nominated in the management structure is not warranted AND it can be demonstrated that the EEMP can be implemented with such an arrangement on a day to day basis then ALL work on electrical installations must be done by a qualified supervisor. In addition any work on high voltage parts of the installation shall be done under the direct supervision of the electrical engineer nominated in the management structure. Individuals who are not qualified supervisors may also do electrical work but it must be done under close and continuous supervision of a qualified supervisor. Any safety and compliance tests should be performed by a qualified supervisor. Reporting and recording of such tests shall be made to the electrical engineer nominated in the management structure. It is not envisaged that surface coal operations utilizing trailing cable fed machinery will fall under this category Work on ELV Automotive installations The EEMP must specify the competencies required for such types of work and where necessary ensure the appropriate training and instruction is given. For ELV automotive, the competencies should be an automotive electrician or a properly trained service mechanic or technician authorised by the plant supplier Work on 240 Volt plug in equipment The EEMP must specify the competencies required for such types of work and where necessary ensure the appropriate training and instruction is given. For 240 volt plug in type equipment, this could be a qualified electrical tradesperson or a qualified electrical engineer, or a properly authorised service technician, or a person with a restricted electrical license, or someone deemed competent by a Registered Training Organisation for the testing and tagging of 240 volt equipment. Page 28 of 74

29 It is not envisaged that this provision will exclude the use of 240 volt tools and other plant by lay persons however some competency training will generally be necessary so that the plant is used in accordance with the manufacturer s instructions, site safe work practices. The user should also be competent to assess whether the plant is rated for the activity and fit for purpose in the proposed working environment Work performed by contractors This shall be specifically addressed in the EEMP. All electrical work performed by contractors should be performed on behalf of the holder of an electrical contractor s license. Where electrical work is performed by contractors the individuals doing the work should be qualified supervisors. Individuals who are not qualified supervisors may also do electrical work but it must be done under close and continuous supervision of a qualified supervisor SAFE SYSTEMS OF WORK OHSR, Clause 207(1), (2) & (3) Electrical work on electrical installations safety measures Electrical work on an electrical installation is carried out using a safe system of work. The safe system of work must include, provisions to prevent work on energised conductors, checks to ensure that the circuits and apparatus being worked on are not energised before work commences and remain that way until the work is completed, and measures to eliminate or control the risk of the person carrying out the work inadvertently contacting any part of the installation that remains energised. That is; isolate all energy sources that could possibly be contacted, either intentionally or inadvertently Safety observers The EEMP should specify situations where safety observers are to be appointed. Safety observers are often required in situations involving: Proximity to high voltage conductors Working at heights Working in confined spaces Welding in Category C environments Other elevated risk situations Safety Observers should be competent for the task being carried out and trained in rescue procedures and CPR Isolation arrangements OHSR, Clause 64 (1) & (2) (c) Electricity particular risk control measures OHSR, Clause 207(2) Electrical work on electrical installations safety measures CMHSR, Clause 83 Isolation arrangements Work on an electrical installation is not carried out while the circuits and equipment being worked on are energised, by isolating potentially damaging energy sources and dissipating or isolating stored energy and taking precautions to prevent inadvertent energising of the circuits and equipment. The EEMP must provide for the development and implementation of Page 29 of 74

30 isolation arrangements so that electrical sources of energy are isolated, checked for dead and earthed and locked out (the lock out is to prevent inadvertent energisation). Where other energy sources are involved these must be isolated as well, and the stored energy dissipated or isolated. INFO Australian Standards Handbook, HB , Handbook: High voltage mining equipment for use underground INFO It is not acceptable to plug and unplug restrained plugs at voltages exceeding ELV whilst relying solely on pilot or earth continuity control circuitry for isolation. INFO EES-001, section for additional information on high voltage isolation INFO MDG 40 Guideline for Hazardous Energy Control (Isolation or Treatment) INFO NSW Minerals Industry Safety Handbook, Sections & NO LIVE LINE WORK. NO WORK ON ENERGISED CONDUCTORS AT NSW MINES Prohibited practices CMHSR, Clause 19(1) (o) Electrical engineering management plan NO WORK ON ENERGISED CONDUCTORS AT NSW MINES NO LIVE LINE WORK The CMHS Regulation prohibits this practice, the prohibition of working on energised conductors in the NSW coal mining industry has been enshrined in legislation since 1984 and has been extremely effective in preventing electrocutions (the last electrocution in the NSW coal industry was prior to the promulgation of the 1984 regulations). Working on live conductors is prohibited except where the voltage is not greater than ELV. Even with ELV precautions to prevent electric shock must be taken. Where the electrical work is being done in a wet or humid environment the circuit should be de-energised and properly isolated. Some ELV circuits have the potential for thousands of amperes to flow if an accidental short circuit occurs. The work should only be undertaken in a clean dry environment and special insulated tools and PPE must be used. OHSR, Clause 207(4) Electrical work on electrical installations safety measures This clause permits work on energised conductors in certain circumstances. Electrical work on an electrical installation may be carried out while energised if it is necessary to do so in the interests of safety and the risk of harm would be greater if the circuits and apparatus were de-energised before work commenced. In these circumstances the employer must ensure that: before commencing, a written risk assessment is completed and that it has been done in consultation with the persons proposing to do the work, the work is carried out in accordance with a safe work method statement for the work, the work has been authorised by the coal operator, Page 30 of 74

31 the persons doing the work are appropriately qualified, trained and instructed in safe work practices for the particular task, including the proper use of test equipment, tools, accessories and personal protective equipment, appropriate test equipment and tools and accessories are provided to the persons doing the work, are properly used and are well maintained, appropriate clothing and personal protective equipment for the work are provided to the persons doing the work and are properly worn and used, the isolation point of the electrical supply has been clearly identified and is able to be reached and operated quickly without any need to negotiate or remove obstacles, the work area is clear of obstruction so as to enable entry and exit quickly and safely, unauthorised persons are prevented from entering the work area by signage or barriers, or both, the work is undertaken in the presence of a safety observer who is competent to perform the particular task that is to be carried out and is competent in electrical rescue and cardio-pulmonary resuscitation, notice is given of the proposed work, at least 7 days before the work commences, to an inspector IT IS NOT ENVISAGED THAT SITUATIONS WILL ARISE AT COAL OPERATIONS WHERE THE RISK OF HARM FROM OTHER MATTERS IS GREATER THAN WORKING ON ENERGISED CONDUCTORS. ELECTRICAL ENGINEERING INSPECTORS HAVE FORMED THE OPINION THAT THE PAST 25 ELECTOCUTION FREE YEARS HAVE DEMONSTRATED THAT WORK ON ENERGISED CONDUCTORS AT NSW COAL OPERATIONS IS NOT NECESSARY AND ANY PROPOSAL TO WORK ON ENERGISED CONDUCTORS WOULD CONSTITUTE AN INCREASE IN RISK TO THE SAFETY OF WORKERS AND THIS WOULD INITIATE ACTIONS IN ACCORDANCE WITH THE ENFORCEMENT POLICY COMMISSIONING AND TESTING OHSR, Clause 64(2) (a) Electricity particular risk control measures CMHSR, Clause 19(1) (r) Electrical engineering management plan All electrical installations must be inspected and tested, after they are installed and prior to their energising for normal use, by a competent person to ensure they are safe for use. An EEMP should specify commissioning and acceptance testing to be carried out after electrical work is completed. These tests are important to ensure that electrical installations are safe for employees and other users and will not cause fires or explosions. Tests should also confirm correct operation of the installation to prevent injury from unintended operation. AS/NZS3000 includes a number of tests that must be carried out on electrical installation work before the installation may be energised. These tests must be done on electrical installations at a coal operation. Page 31 of 74

32 The visual inspections required by AS/NZS3000 must be carried out and the following must always be tested for safety and compliance: Continuity of the earthing system Insulation resistance Polarity Correct circuit connections Earth fault-loop impedance Operation of RCDs. If the electrical installation fails a test, that test and any preceding tests that may have been influenced by the fault indicated shall be repeated after the fault has been rectified. Where one or more residual current devices (RCD s, also known as safety switches) are fitted each device must also be tested in accordance with at least one of the tests in AS/NZS This test is considered to be essential as many accidents - some fatal - involving employees, electricians and others could be prevented if RCD s are installed correctly and are operating as they are intended. These include situations where electrical workers have neglected to isolate the wiring on which they are working or when an installation or electrical article is faulty or the owner has not adequately maintained the installation. Testers should verify that the RCD is working by operating the integral test device and by the use of special RCD test equipment. Other earth leakage protection devices should be tested by a test method that involves direct injection. Any stand-alone electrical installation at a coal operation (i.e. supplied by private generating equipment) should also be subject to the tests including confirmation that it complies with the requirements for such systems specified by AS 4509:1999, Stand-alone power systems. In the mining industry it is also important to check that the installation will operate in the manner intended by the parties who agreed or arranged for the work to be carried out. This is to avoid situations where persons may be exposed to risk by unintended operation of plant. Additional tests should be carried out for High Voltage installations Electrical testing safe methods OHSR, Clause 208(1) & (2) Electrical testing on electrical installations safety measures CMHSR, Clause 19(1) (s) (ii) Electrical engineering management plan Specific electrical testing procedures are required to be developed, implemented and monitored. Live testing using hand held instruments should be an absolute last resort and is strongly discouraged in coal operation environments. It should only be done after a risk assessment, in particular the risks from electric shock, arc flash and arc blast injuries must be evaluated and controlled. PPE is an essential risk control and the type of PPE will depend on the risks from electric shock, arc flash and arc blast. Persons conducting tests for the integrity and operability of energised circuits and apparatus of an electrical installation conduct the tests in a safe manner that uses a safe system of work that includes: Page 32 of 74

33 measures to eliminate or control the risk of inadvertent contact with energised (including safe work practices to minimise the risk of inadvertent contact, if the risk cannot be eliminated), appropriate test equipment is provided and properly used by appropriately trained persons, and appropriate personal protective equipment is provided and used by the persons conducting the tests, and tests are conducted in the presence of a safety observer where the risk warrants it. The safety observer must be competent to assist the persons who are conducting the tests and competent in electrical rescue and cardio-pulmonary resuscitation Where tests are routinely carried out as part of maintenance, calibration and fault finding the equipment must be designed with appropriate diagnostics and/or protected test points that are only accessible to qualified electrical people. INFO EES-004 NSW DPI Technical Reference for Electrical Practices for Portable Apparatus INFO HB187 Guide to selecting a safe multimeter INFO Live testing on power circuits is specifically prohibited in hazardous zones as these compromises the explosion protected properties of electrical equipment. In underground, non-hazardous zone environments an instrument can be connected to an isolated circuit in such a way that the instrument can be seen and the power can be restored (under strictly controlled conditions) so that instrument readings can be taken. Isolation must be undertaken before disconnecting the instrument HAZARDOUS AREA / ZONE INSTALLATIONS Installation of electrical equipment in a hazardous area should be in accordance with AS/NZS 2290 and AS/NZS These standards also contain additional commissioning tests for hazardous area equipment. The EEMP for the operation should specify the particular commissioning tests for the type of equipment in use. For example, a transportable flameproof Distribution and Control Box should be subject to the following commission checks after a relocation and prior to energisation: Insulation test Earth continuity test Examination of the explosion protection properties of the enclosure, attachments and supply cables Checks to ensure the cables are installed in accordance with the cable management plan Check for phase rotation at an outlet Functional test Test of the protection devices Confirmation of appropriate labels and signs INFO EES-003 NSW DPI Technical Reference - Practices for the Life-Cycle Management of Explosion Protected Equipment REPORTING AND RECORDING OF TEST RESULTS OHSR, Clause 65 Maintenance of records - electricity Page 33 of 74

34 CMHSR, Clause 19(1) (r) (ii) Electrical engineering management plan An EEMP should specify the manner of reporting the results of safety and compliance tests. It is recommended that the form be consistent with the standard form in use generally. This form is in use in the electrical industry and has been approved by the Director-General of Fair Trading. The form should require details including: The location of the electrical installation where the work was done The location of the work within the electrical installation The work actually done The name and authority (i.e. the relevant license or certificate issued under the Home Building Act) number of each person who actually did or supervised the electrical installation work (for a person who worked for two years as an electrical tradesperson at a coal mine prior to 23 December 2008, the authority is the operator) The name and authority number of any person engaged by the coal operation to provide or arrange for the electrical installation work concerned (the responsible person i.e. a person who enters into a contract to arrange for employees or subcontractors to do electrical installation work) The name and authority number of the person who tested the electrical installation work. The form should include a checklist of the required tests and be signed by the responsible person (if any) and by the tester. For an electrical installation in NSW the notification of the results of safety and compliance tests to distribution network service providers is not required by legislation. However equivalent provisions mirroring those that occur in non mining installations are required by the Coal Mine Health and Safety Regulation The reason is to provide a consistent framework for testing and reporting for electrical contractors and to ensure that there is traceability for electrical work. An example of the process would be: Completion of a safety and commissioning test report by a qualified supervisor (or a person who worked for two years as an electrical tradesperson at a coal mine prior to 23 December 2008) Submission of the report to a qualified engineer within a specified time frame Review and acceptance by the qualified engineer Keeping the report in a specified manner for a specified time INFO Refer to the Gazette Notice for Retention of Notifications INFO There are no specified notification forms. INFO Typical forms can be obtained from the local supply authority or NECA. Examples are given in AS/NZS3019. INFO Reporting following maintenance work on the installation should be in accordance with the requirements of the maintenance system at the operation When to report Reporting of test results should be required when electrical installation work involves: Page 34 of 74

35 Work on a distribution board or associated electrical equipment including relocation of a board (other than repair or maintenance work, which is defined as replacing equipment without increasing the electrical loading or changing the method of electrical protection or system of earthing) The provision of customer connection services For underground coal operation transportable assets such as DCB s, HV circuit breakers and substations should be considered as equivalent to a distribution board Who should report results An EEMP should include specifying the responsibility for reporting the results of safety and compliance tests. Reports should be to the Manager of Electrical Engineering or Qualified Electrical Engineer and should be kept within the coal operation s record keeping system. Where the testing has been performed by a permanent employee of the coal operation the responsibility for notification falls to the tester. Where the electrical work was performed by a contractor the person, whether an individual or corporation, who is engaged to do or arrange for electrical installation work (usually the main contractor) should be responsible for providing the notice of results of the safety and compliance tests to the Manager of Electrical Engineering or Qualified Electrical Engineer Whom to notify An EEMP should specify the person who will receive safety and compliance reports at a coal operation. The person receiving the reports shall be a Manager of Electrical Engineering or a Qualified Electrical Engineer Why notify? The notification system serves three main purposes: 1. The notice provides a means for a Manager of Electrical Engineering, or Qualified Electrical Engineer, to consider the electrical installation as a whole and may prompt audit of the work and possibly discussions with the electricity distributor and metering provider about variations in load. Any work on a distribution board, including relocation, is considered to be hazardous and can have implications about the way electricity is distributed and managed at a coal operation. It should be noted that electrical installation work that will result in the provision of any customer connection services must not be carried out unless the distribution network service provider that supplies or is to supply the electricity to the installation has indicated to the customer that its distribution system has the capacity to supply electricity for the installation. 2. The notice documents a detailed description of electrical installation work done. It should also be used to note when the electrician has recommended that particular additional work is advisable for safety reasons even if this was outside the scope of the work. 3. It provides the Manager of Electrical Engineering or Qualified Electrical Engineer of the coal operation with a document that certifies the work has been done to (at least) the required standard. It is a form of assurance for the operator who may be relying on the professionalism of the electrical contractor that has been engaged. The notice reinforces the contract between the operator and the electrical contractor or other Page 35 of 74

36 person responsible for the work but also provides written confirmation if an operator has decided, against the advice of the electrician, not to have additional electrical installation work done, or safety concerns rectified HIGH VOLTAGE PRACTICES CMHSR, Clause 19(1) (n) & (v) Electrical engineering management plan High voltage installations are to be operated safely throughout their lifecycle; this includes having access procedures for working on high voltage equipment, and measures for safe removal and restoration of power in other circumstances. Access procedures must provide for: isolation, testing for dead, application of locks to switchgear to prevent inadvertent energisation, and the application of operator earths and working earths For high voltage distribution systems a permit to work system must be used and records kept. High voltage work is inherently high risk work. Any High Voltage work must be carried out in accordance with the High Voltage Safety Management Plan in effect at the operation. 3 Switching operations should only be carried out by persons who are current in their training and are on a register of authorised persons for the operation. Relevant training includes: High Voltage Switching High Voltage Access Permit Issuer and Receiver training Local requirements for the operation Switching officers should be familiar with the High Voltage distribution system. High Voltage work should be closely supervised by a person qualified to be a High Voltage switching officer. High Voltage work should be carefully planned in advance, documented, subject to a risk assessment and monitored. Any changed circumstances should cause work to stop and a formal review of the work plan to take place. Work on high voltage installations will need a high degree of: Rigor Documented procedures, records, check lists and permits Competency Supervision For underground mining applications voltages of 1000 V a.c. and 1100 V a.c. have been commonly used in a similar manner to voltages of 415 V a.c. and 550 V a.c. (low voltage). Previous legislation required that voltages exceeding 1200 V a.c. not be applied to certain types of apparatus (explosion protected, mobile, portable, or motors smaller than 3 High Voltage Safety Management Plans are required by Network Operators for all high voltage customers. Such plans should be integrated into the EEMP Page 36 of 74

37 15Kilowatts). From this there is a common and accepted practice of considering high voltage to be greater than 1200 V a.c. in underground mining applications and associated surface applications. Where a coal operation chooses to not use accepted (mining and non-mining industry) high voltage practices on circuits whose nominal voltage exceeds 1000 V and is less than 1200V, this must be supported by a risk assessment and nominated controls, including specific procedures to prevent electric shock, arcing and failure of explosion protection. It is not acceptable to plug and unplug restrained plugs at voltages exceeding ELV whilst relying solely on pilot or earth continuity control circuitry for isolation. Underground coal operations use mining machinery powered at 3.3 kv. High voltage practices and procedures must be used on these circuits, it is not acceptable to plug and unplug restrained plugs at 3.3kV, without effecting proper isolation. Proper isolation does not rely on a contactor as the sole power conductor opening device. INFO Refer to HB 242:2007, Handbook: High voltage mining equipment for use underground INFO NSW Service and Installation Rules and in the ESAA Substation Earthing handbook SAFE ACCESS FOR ELECTRICITY SUPPLY AUTHORITY WORKERS CMHSR, Clause 19(1) (p) & (q) Electrical engineering management plan Electrical transmission and distribution systems often cross coal operations. Where these do not directly supply electricity for mining activities the responsibility for working on this infrastructure lies solely with the electricity supply authority. The electricity supply authority need safe access to maintain and repair this infrastructure and have legal obligations to do so. Any work done on this infrastructure is required to be done in accordance with the electricity supply authority s work procedures as part of a plan required to be lodged under the Electricity Supply (Safety and Network Management) Regulation Provisions for the safe access and safety from hazards created by the operator are to be made for electricity supply authority workers who are required to work on the supply authority s infrastructure The coal operation must cooperate with the electricity supply authority and provide safe access to the supply authority s infrastructure. The coal operation must also ensure that the supply authority workers are not put at risk from the coal operation s activities. Where the electricity distribution system is under the day to day control of the coal operator and the electricity supply authority is contracted to do work or has an obligation to do work on that distribution system then ALL of the provisions of the coal legislation apply. Clause 207 Electrical work on electrical installations safety measures of the OH&S Regs do not apply to electrical work done as part of a plan required to be lodged under the Electricity Supply (Safety and Network Management) Regulation Standards of Engineering Practice (SEP s) CMHSR, Clause 19(1) (b) Electrical engineering management plan Requires SEP s to be developed and implemented for electrically powered plant, electrically controlled plant, electrical installations, competencies and electrical practices and installations. Electrical equipment and electrical installations used in mining and particularly in underground operations require high standards of design, commissioning, installation, inspection, maintenance, overhaul, repair and de-commissioning. To this end reliance on electrical equipment that is used in domestic or benign industrial environments is not sufficient to adequately manage the risks. Electrical equipment and installations for use in operations have additional, more stringent requirements. The requirements for life cycle Page 37 of 74

38 management of electrical equipment requires SEP s to be developed, implemented and monitored. The SEP s are a critical component of the EEMP. The SEP s provide the technical and electrical engineering requirements for equipment, competencies and procedures. The EEMP gives effect to implementing those technical and electrical engineering requirements in a way that delivers compliance with the legislation in total. SEP s should be used for establishing standards on matters where Legislation, Australian & International Standards, Codes of Practice and other guidelines are silent or outcomes based. Some general points to consider are: A process for establishing and documenting SEP s. Competency requirements for people working on electrical installations. SEP s for Specification and Design, Installation, Commissioning, Operation, Maintenance, Overhaul, Repair, Decommissioning, Systematic Examination and Testing. Assessment of standards for compliance with legislation. Accessibility of SEP s. Use of SEP s for specifying electrical requirements for any plant purchased or hired. Responsibility for implementing SEP s and responsibility for inspections to verify compliance with the SEP e.g. a SEP for installation and use of trailing and reeling cables in a development section - may require the section supervisor (deputy) to be responsible for installation and a section electrician may be responsible for inspecting the installation against the SEP and reporting any non-conformance to the manager of electrical engineering. Monitoring of SEP s. Notification of standard not being met. Qualified tradesperson qualifications are a minimum standard for competencies. For hazardous area equipment additional competencies will be required. INFO AS/NZS 4761, Parts 1 & 2 Competencies for working with electrical equipment for hazardous areas (EEHA) - Competency Standards & Guide to assessing competency INFO AS/NZS 4871, Parts 1-6 Electrical equipment for coal mines, for use underground INFO NSW Minerals Industry Safety Handbook, Sections & Compliance with AS/NZS 3000 and AS 3007 CMHSR, Clause 19(1) (b) Electrical engineering management plan Electrical installations located on the surface must comply with AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules) and AS 3007 Electrical installations surface mines and associated processing plant. 3.8 Electrical Plant used in Hazardous Zones CMHSR, Clause 19(1) (c), (d), (e) & (f) Electrical engineering management plan Requires only specified plant be used in a hazardous zone, that it is maintained in an Ex condition and that overhaul and repair of Ex equipment and flexible reeling, trailing and feeder cables is only to be done at licensed facilities. Measures have to be taken to prevent arcing faults compromising explosion protection properties of plant and installations (including cables).these clauses require the life cycle management of electrical installations and equipment in hazardous zones. Page 38 of 74

39 3.8.1 PLANT THAT CAN BE USED IN A HAZARDOUS ZONE Electrical apparatus used in hazardous zones to be certified. Only electrical apparatus certified as Ex i, Ex ia Ex ma, Ex s (and in the future plant with an explosion protection level of Ma ), and the associated cables being used in a hazardous zone where a flammable gas concentration is greater than 1.25%. Where non-explosion protected portable battery powered apparatus is used it must comply with specified requirements and be used under specified conditions of use. Only cables complying with AS/NZS 1802 or AS/NZS 1972 to be used for nonintrinsically safe applications in an underground hazardous zone. Other cables containing only intrinsically circuits may be used in hazardous areas after the suitability or otherwise of such cables is determined by the manager of electrical engineering. Cables used solely for intrinsically safe circuits that do not comply with the specified standards should be designed and/or installed to minimise risk from static electricity and fire. They must also be designed and installed to maintain intrinsic safety properties under fault conditions. Refer to AS/NZS 2381, parts 1-7. INFO Gazette Notice for Specification of Plant that can be used in a Hazardous Zone INFO Gazette Notice for the conditions of use of non-explosion protected plant in a hazardous zone MAINTENANCE, OVERHAUL AND REPAIR OF EX PLANT Explosion-protected plant and installations must be maintained in an explosion-protected state. Ex plant must be overhauled and repaired only at a licensed facility. Flexible reeling, trailing and feeder cables that are used in a hazardous zone must only be repaired at a licensed facility. INFO Gazette Notice for considering certain workshops to be licensed INFO Gazette Notice for the specification of requirements to be licensed as a cable repair workshop INFO EES-007 NSW DPI Technical Reference for the Licensing of Cable Repair Facilities for Reeling, Trailing and Flexible Feeder Cables used in NSW Underground Coal Mine Hazardous Zones INFO EES-001 Chapter ARCING FAULTS IN EXPLOSION-PROTECTED PLANT TO BE CONTROLLED. Engineering arrangements must be made to prevent arcing faults compromising explosionprotection properties of plant and installations (including cables), some points to consider are: MEMMES document on arc fault control. Certificates of conformity. Operational risk assessment. Fault study considerations. Protection settings. Page 39 of 74

40 Energy let through during clearance of a fault MANAGEMENT OF CABLES IN A HAZARDOUS ZONE Flexible cable management in a hazardous zone to be addressed in SEP s and include: Transport and storage of spare cables. Testing and inspection of cables in the operation. SEP for the standard of installation of cables. Responsibilities for installation. Responsibilities for inspecting and reporting on the status of cable installations and management. Removal of power when SEP s are not met. Damaged cable reporting and investigation. Reporting of arcing in a hazardous zone. Cable replacement practices licensed cable repair workshops give repaired cables a condition score: the lower the score, the worse the overall condition. Cable replacement should be identified as being required when a cable condition score falls below the operation site standard OTHER CONSIDERATIONS Identification and classification of hazardous areas, other than the prescribed hazardous zones. Documenting hazardous zones and areas with plans and diagrams. Signage identifying hazardous zones and areas. Register of all Ex plant at the operation. For hire equipment access to the hirers register of Ex plant. Record keeping and access to information in the hazardous area equipment dossier as required by AS/NZS People working on explosion protected equipment having competencies in accordance with the national standards (AS/NZS 4761) for work on hazardous area electrical equipment. INFO EES-003 NSW DPI Technical Reference for the Life-Cycle Management of Explosion Protected Equipment INFO EES-004 NSW DPI Technical Reference for Electrical Practices for Portable Apparatus 3.9 Static Electricity CMHSR, Clause 19(1) (g) Electrical engineering management plan This relates specifically to electrical plant and requires measures to be taken to prevent the ignition of gas by a static electric charge. These control measures include, earthing and bonding on other plant and testing of other plant to establish anti-static properties. Non-electrical plant that may have a static electricity risk may be managed via other management plans such as the Mechanical Engineering Management Plan. Where this is the case the EEMP should establish the required standards for controlling the risk from static electricity. AS/NZS 1020 is an important reference. For cables complying with AS/NZS 1802 and AS 1972 no additional measures are required. Page 40 of 74

41 ILO For certified Ex plant that has an x mark this may relate to special precautions to be taken because there is a static electricity hazard. Care needs to be taken when selecting equipment (plastic enclosures are an obvious example) to ensure that a static electricity hazard is not introduced when there is alternative equipment (metallic enclosures connected to earth are an obvious example). For portable apparatus that may have a static hazard a common risk control is the use of leather carry cases and/or leather covers. MESHCM/2006 Section Conveyor belt to be anti-static 3.10 Electrical Protection CMHSR, Clause 19(1) (h) Electrical engineering management plan Requires electrical protection to be fitted to all circuits and to interrupt the supply when a fault occurs and that protection devices are properly constructed. Special protection has to be provided on certain types of circuit Short circuit protection should detect and clear arcing faults. Arcing faults have resistance and therefore the short circuit trip setting of the protection device should not exceed 60% of the prospective fault current calculated for the furthest point on the system being protected. (A setting of 50% is considered best practice). The EEMP shall provide for each electrical circuit to have a fault level study and protection setting study so that every electrical circuit can be provided with short circuit protection that will automatically disconnect the supply of electricity in the event of a fault. The depth of the study will vary depending on the complexity of the system, from high voltage reticulation to elementary single circuits. Extra low voltage circuits are included, these are sometimes supplied by a cable from a distance and the cable impedance can cause the current to be limited to a lesser value than the trip setting. Motor contributions during short circuit fault conditions shall be taken into account when determining through current rating and tripping capability of switchgear. Motor contributions should be ignored in the determination of the setting of the fault current protection. Information detailing protection studies, fault level studies and a single line diagrams are essential. For IT systems the protection devices should comply with AS/NZS The first fault should be a low energy earth fault. Earth leakage protection should be fitted to every circuit and sub-circuit. 30milliamp RCD s should be fitted to 240 V socket outlet and lighting circuits and transportable/portable (cartable) plant circuits (such as pumps that may be handled whilst energised e.g V small flygt pumps). Coal face plant earth leakage settings should not have any intentional time delay. Earth leakage testing requirements should be more often if there is only one means of earth leakage protection. Back up earth leakage protection is recommended. Back up earth leakage systems may be time graded to provide discrimination. On three phase systems, one earth leakage test circuit should involve a direct test to earth through appropriately rated current limiting test resistor and adequately rated switchgear. Alternatively, a device to continuously monitor the integrity of the star point connection and current limiting resistor to earth should be fitted. Page 41 of 74

42 On single phase systems a regime of testing should include regular testing using the inbuilt test button and periodic tests by a qualified electrical tradesperson or qualified electrical engineer using an instrument designed to test the tripping time and tripping current. Earth fault lock out is required to prevent the connection of electrical power to mobile or portable electrical apparatus in the event of an earth fault on a flexible cable supplying the apparatus. Typically this is applied to poly-phase equipment. This is a known, proven and effective risk control for electric shock and for hazardous zone applications. This risk control should also be applied to flexible cable fed equipment in non-hazardous zones. It is not intended that this be applied to hand held 240V appliances and tools used in a non-hazardous zone. Earth continuity protection is required to interrupt the supply of electricity to mobile or portable electrical apparatus when the continuity of the connection to earth is compromised. This is applicable to ALL types of equipment fed via flexible trailing cables. It is intended that this is applied to poly-phase systems. It is not intended that this be applied to hand held 240V appliances and tools used in a non-hazardous zone. The integrity of the earth connection can be compromised by open circuit or excessive resistance in the earth conductors. Electrical protection systems are considered to be electrical safeguards as per Clause 13(e) of the CMHS Regulation. As such the detection and clearing of electrical faults should have a very high reliability. (This includes the actual trip circuit from trip circuit power source to the actuator that initiates the trip.) INFO EES-005 NSW DPI Technical Reference for Electrical Protection and Earthing ILO ILO MESHCM/2006 Section (g) Electricity Hazard control General provisions ground fault protection and ground check monitoring, p120 MESHCM/2006 Section Electricity Electrical systems Overload and short circuit protection, p Earthing CMHSR, Clause 19(1) (i) Electrical engineering management plan Requires effective earthing to be provided so that the risk from touch, transfer and step potential is minimised, lightning effects are not transmitted into an underground operation and earth fault currents are limited to mobile and portable equipment and to all underground circuits. The first fault should be a low energy earth fault. Resistors should be fitted to replace reactors so that the inrush earth fault current is limited during the initial cycles of fault current. INFO EES-004 NSW DPI Technical Reference for Electrical Protection and Earthing INFO AS/NZS 2081 for recommended levels of earth fault limitation INFO AS/NZS 3000 and AS 3007 ILO MESHCM/2006 Section (g) Electricity Hazard control General provisions standards for earthing, p120 Page 42 of 74

43 ILO MESHCM/2006 Section Electricity Electrical systems Earthing (grounding) systems, p Switching Electrical Power CMHSR, Clause 19(1) (j), (k), (l) & (u) Electrical engineering management plan CMHSR, Clause 117 Operators duty where failure of main ventilation system Requires suitable switchgear to be provided and provisions to be made for the safe removal and restoration of power in specific circumstances. There is also a requirement that if there is a failure of the main ventilation fan then the power underground is automatically switched off. In addition every battery operated portable or mobile machine must be taken to a safe place (main intake airway or properly constructed charging station) in the event of a main ventilation fan failure. Suitably rated and designed switchgear has to be provided at strategic locations as a means of removing danger to any person. It should be provided at the incoming supply point (or at the generator, as the case may be). The electrical reticulation system should be sectionalised so that specific parts of the system can be isolated without affecting other parts and facilitate inspection, maintenance, testing (minimal disruption to the part of the installation not being maintained) and fault finding. The switchgear must be able to be operated without endangering the switchgear operator. Particularly the risks from arc blast injuries need to be considered. This may require remote switching capabilities. The switchgear should be adequately rated with regard to voltage, frequency, temperature, normal operating current, overload current, ability to make and break the maximum prospective fault current, ability to withstand the maximum prospective through fault current, working environment, electromagnetic compatibility and the ability to withstand electromagnetic radiation interference. SEP s should specify installation requirements for this switchgear in particular in underground locations. These SEP s should include adequate signage and circuit and distribution diagrams. Automatic tripping of the underground power (that is not intrinsically safe Ex ia) must be provided in the event of the main ventilation system failing. This arrangement must have an appropriate SIL and power must be incapable of being restored before the main ventilation system is repaired and restarted. The tripping should, in general occur immediately and without any intentional delay. Mines accessed by powered winding systems should consider the effects of this requirement on the ability to provide transport of persons from the mine in the event of a prolonged ventilation failure. Removal and restoration of power procedures must provide for the removal of electric power in any of the following circumstances: In the presence of flammable gas - for non Ex equipment the maximum gas concentration is 0.25%, for Ex equipment other than specified types (eg Ex ia) the maximum gas concentration is 1.25%. If ventilation falls below a specific quantity. If inspections required by the inspection program have not been conducted. In the event of an electrical fault. Page 43 of 74

44 If there has been a failure to maintain equipment in accordance with the EEMP. If unsafe electrical equipment or practices have been detected. Procedures to ensure that in the event of a failure of the main ventilation system the electric power supply entering the coal operation (other than power to equipment registered as intrinsically safe) is not restored until it is safe to do so. Removal and restoration of power procedures must provide for the restoration of power only by people competent to operate the switchgear. It is important to recognise that after a fault trip, a thorough investigation must be undertaken to identify the cause of the trip and rectify any problems before restoration of power is attempted. Procedures to ensure that In the event of a failure of the main ventilation system for part of the operation every battery-operated portable or mobile machine located in that part is brought out without delay to the main intake airways or a charging or repair station of suitable fireproof construction that is normally ventilated with intake air. Procedures to ensure that In the event of a failure of the ventilation system for part of the operation any non-explosion-protected portable electrical plant permitted by the mines portable apparatus scheme located in that part is brought out without delay to the main intake airway Power must not be restored after a main ventilation fan failure until a mining supervisor has determined it is safe to do so. INFO Gazette Notice for the conditions of use of non-explosion protected plant in a hazardous zone INFO EES-006 NSW DPI Technical Reference for Removal and Restoration of Power ILO ILO ILO MESHCM/2006 Section (h) Electricity Hazard control General provisions loading and design of circuit breakers, p121 MESHCM/2006 Section Electricity Hazard control General provisions switchgear for turning off the power, p122 MESHCM/2006 Section Electricity Electrical systems Transformers and switchgear, p Use of Portable Apparatus CMHSR, Clause 19(1) (m) Electrical engineering management plan CMHSR, Clause 68(d) Combustible liquid storage Only battery powered portable apparatus that meets certain requirements can be used in a hazardous zone if it is not certified or approved as explosion protected. Portable electrical tools must not be operated within 10 metres of any storage underground (above 60 litres capacity) of any grease, lubrication, hydraulic oil or fuel oils. Only battery powered portable apparatus that meet certain requirements and are used in accordance with certain conditions can be used in a hazardous zone if it is not certified or approved as explosion protected. INFO Gazette Notice for Specification of Plant that can be used in a Hazardous Zone INFO Gazette Notice for the conditions of use of non-explosion protected plant in a hazardous zone Page 44 of 74

45 INFO EES-004 NSW DPI Technical Reference for Electrical Practices for Portable Apparatus 3.14 Specific Procedures NON-ELECTRICAL WORK NEAR ENERGISED ELECTRICAL EQUIPMENT OHSR, Clause 41(4) Electricity particular risk control measures Persons working in or undertaking maintenance on, the premises (doing non-electrical work) are prevented from coming within an unsafe distance from any overhead electrical power lines or live electrical installations unless a risk assessment determines otherwise. It is expected that documented procedures would be one element in a system that provide for this ELECTRIC SHOCK PROTOCOLS CMHSR, Clause 45(a) (ii) & (e) Contents of emergency management system Must make arrangements for the treatment of sick and injured people including victims of electric shock Typical electrical matters are electric shock protocols, electric burn protocols and arc blast injury protocols. When anyone receives an electric shock they should be given professional medical assessment, treatment and care. As a minimum a 12 lead ECG should be conducted to detect any irregular heart rhythms. Some points to consider for inclusion in electric shock protocols: 12 lead ECG. Notifiable incident process. Treatment from health care professional USE OF ELECTRIC WELDING EQUIPMENT CMHSR, Clause 19(1) (s) (i) Electrical engineering management plan Requires specific procedures to be used for electric welding equipment INFO Safe welding practices: MDG25, AS/NZS WTIA TN 7-98 publication EES decision Sheet USE OF ELECTRICAL TEST INSTRUMENTS CMHSR, Clause 19(1) (s) (ii) Electrical engineering management plan Requires specific procedures to be used when conducting electrical tests / using electrical test instruments INFO EES-001 Section Page 45 of 74

46 3.15 Overhead Power Lines & Cables & underground (buried) cables CMHSR, Clause 19(1) (s) Electrical engineering management plan CMHSR, Clause 72 Overhead power lines and cables OHSR, Clause 64(2) (e) & (d) Electricity particular risk control measures OHSR, Clause 241(3) Potential risks arising from excavation work particular risk control measures A safe distance must be maintained between people, plant, tools and other equipment and any energised overhead power line or cable and safe work procedures must be developed to work near those lines or cables If excavation work is to be carried out, all available information concerning the position of underground electrical cables is obtained and disseminated to the persons doing the work. Overhead Power Line management: Transport Management Plan to consider overhead power lines Site plan showing the location of all overhead power lines and cables. Site plan must be readily accessible to supervisors. The risk from overhead power lines and cables must be considered in risk assessments. Procedures must be developed for work near overhead power lines and cables. Safe distances must be maintained between overhead lines, cables and machinery. (The maintaining of safe distances usually results in prohibiting the storing of materials, mining product or the like under overhead lines and cables.) Provision of signs warning of overhead lines and cables. Provision of height barriers. Provision of warning devices or propulsion interlocks on machinery such as rear dump trucks when dump trays are in the raised or partially raised position. Also consider installation of warning devices on cranes, rear dump trucks and drill rigs to operate an alarm when too close to overhead lines. Buried Cable management: Site plan showing the location of all buried cables. Site plan must be readily accessible to supervisors. The risk from contacting buried cables must be considered in risk assessments. (This generally precludes storing materials, mining product or the like over buried cables.) Procedures must be developed for work near buried cables. Safe distances must be maintained between temporarily exposed buried cables and machinery. Provision of signs warning of buried cables and their buried depth. INFO NSW Minerals Industry Safety Handbook INFO Workcover Code of Practice for Overhead Power Lines 3.16 Signage and Plans CMHSR, Clause 19(1) (t) Electrical engineering management plan Page 46 of 74

47 OHSR, Clause 64(2) (g) Electricity particular risk control measures The placing of appropriate signage, notices, plans and electrical distribution diagrams at electrical switchgear or near any area in which there is a risk of exposure of persons to hazards arising from electricity and other prominent positions that: Warn of the presence of electricity. If necessary restrict access Provide advice on what to do in the event of a fire on electrical equipment. Provide advice on what to do in the event of an electric shock and other electrical injuries. Provide advice on the isolation point for the electrical equipment. Provide advice on what electrical equipment the switchgear supplies. Show the location of all high voltage cables and switchgear on a mine plan. Show all points of isolation available on the electrical distribution system. Adequate signs to warn of the hazards and (if necessary) restrict access are provided at or near any area in which there is a risk of exposure of persons to hazards arising from electricity.. ILO MESHCM/2006 Section & Electricity Hazard control General provisions- map showing the location of electrical equipment and notices and signs, p122 Page 47 of 74

48 Chapter 4 Electrical Engineering Management Plan, other management plans and regulatory requirements 4.1 Relationship to other plans and requirements It is expected that the EEMP will provide inputs to or provide for elements of other management plan requirements and non-clause 19 matters. How this is achieved is operation specific and is likely to vary from site to site. The key point is that the EEMP should clearly establish links to the other management plans and to systems required by regulation. 4.2 Electrical Engineering Management Plan and other management plans MECHANICAL ENGINEERING MANAGEMENT PLAN (MEMP) CMHSR, Clause 13(1) (f) Additional components of health and safety management system There will be a close relationship between the electrical and mechanical engineering management plans particularly in the area of mobile equipment. Where mobile equipment is under the auspices of the MEMP the EEMP must provide for the electrical aspects of the mobile plant if it is electrically powered, electrically controlled, contains any electrical circuitry or electrical safeguards are provided MAJOR HAZARD MANAGEMENT PLANS CMHSR, Clause 28 Prescribed major hazards These major hazards are required to be controlled by major hazard management plans which require certain matters to be addressed. Below are matters to which the EEMP may provide input Surface transport management plan CMHSR, Clause 30 Contents of major hazard management plan: surface transport management plan Where electrical or electronic means are used for: Monitoring and keeping transport within its design parameters. Keeping transport below a maximum speed. Anti-collision detection and warning devices. Use of people detection devices, reversing alarms or cameras. Other matters to be included: Inspection of electrical components and safeguards must be included in transport inspections. Operation near overhead lines and cables. Procedures when OHL s contacted. Page 48 of 74

49 Underground transport management plan CMHSR, Clause 31 Contents of major hazard management plan: underground transport management plan Electrical components to be suitable for use in the event of a ventilation failure. Electrical interlocks to ensure doors are closed, Lights, Warning devices and alarms. Pre-use inspection of electrical components, electrical interlocks to ensure doors are closed, and that lights, warning devices and alarms operate. Charging of the transport batteries. SEP s to be developed and implemented for charging stations. Reporting electrical defects on transport Strata failure management plan CMHSR, Clause 32 Contents of major hazard management plan: strata failure management plan Electrically powered or controlled plant such as mobile drill rigs and electronic monitoring & alarms for strata monitoring Fire and explosion management plan CMHSR, Clause 35 Contents of major hazard management plan: fire and explosion management plan Hazardous area identification and classification Life cycle management of electrical Ex plant. Life-cycle management of gas detecting plant. Life-cycle management of gas drainage plants. Life cycle management of ventilation monitoring and tripping systems. Provision of fire fighting equipment at electrical installations. Location of critical electrically powered infrastructure on mine plans. Electrical safeguards for the detection of fires and/or initiation automatic fire suppression systems. Electrical safeguards for the detection and measurement of flammable gases and initiation of power interlock trips. SIL or Category of electrical safeguards Dust and explosion management plan CMHSR, Clause 36 Contents of major hazard management plan: dust explosion management plan At this stage it is not envisaged that explosion barriers and other explosion suppression measures will have any electrical content Explosives management plan CMHSR, Clause 37 Contents of major hazard management plan: explosives management plan Electrical requirements and life-cycle management of plant used to store and transport explosives. Page 49 of 74

50 SIL requirements for electronic detonators and shotfiring equipment. In the case of an underground operation, the use of specified electric shotfiring and testing apparatus and life cycle management of electric exploders and circuit testers. INFO Gazette Notice for requirements for design registration of shot firing apparatus Airborne dust management plan CMHSR, Clause 38 Contents of major hazard management plan: airborne dust management plan Electrically monitored water supply and SIL levels of such circuits for coal cutting machines. 4.3 Electrical Engineering Management Plan and other coal mines regulations requirements These regulations require that certain matters be addressed. Below are those matters to which the EEMP will either manage or provide input into the management of the particular matter along with typical issues INSPECTION PROGRAM CMHSR, Clause 15 Inspection program If an inspection detects unsafe or suspected unsafe electrical installations, plant or practices then the manager of electrical engineering, qualified electrical engineer or other electrically qualified person that is nominated in the management structure must be notified. Similarly for the reporting of any remedial action and concerns as a result of the remedial action taken. The regular and timely review of reports of inspections with regard to electrical matters by the manager of electrical engineering, qualified electrical engineer or other electrically qualified person that is nominated in the management structure. Inspection for the presence of flammable gas before connecting power to any plant INFORMATION AND COMMUNICATION ARRANGEMENTS CMHSR, Clause 16 Information and communication arrangements Minimum communication of day to day Electrical Engineering Safety matters. Electrical persons in the management structure to communicate specific Electrical Engineering Safety issues that may arise from time to time. All other communication matters in the regulations to be considered in relation to Electrical Engineering Safety. For life cycle management of telephonic communications and to ensure that for underground operations it is Intrinsically Safe category Ex ia and that telephonic devices are located at: Every underground entrance to a shaft or outlet for ingress or egress. Every place underground where plant is regularly serviced or charged. A reasonably accessible place in each underground production area. A place in proximity to underground switch-gear. Page 50 of 74

51 Places in proximity to every underground conveyor belt drive head and transfer or loading point MONITORING ARRANGEMENTS & VENTILATION ARRANGEMENTS CMHSR, Clause 18 Monitoring arrangements CMHSR, Clause 21 Ventilation arrangements Where the monitoring and any alarm arrangements are provided by electrical equipment the EEMP will need to provide for the life cycle management and calibration of electrical devices. Where alarms, interlocks and tripping of power are required the appropriate SIL should be specified in the safety requirements specification and realised in the final design. Where auditing of arrangements is a requirement the electrical aspects will need to be incorporated. ILO MESHCM/2006 Section 12.5 Mine ventilation fans, p82-83 ILO MESHCM/2006 Section 12.6 Booster fan control, p83-84 ILO MESHCM/2006 Section 12.7 Auxiliary fan control, p84-86 ILO MESHCM/2006 Section Methane monitors, p92-93 ILO MESHCM/2006 Section Atmospheric monitoring systems for mine-wide monitoring, p EMERGENCY MANAGEMENT SYSTEM CMHSR, Clause 45 Contents of emergency management system The EEMP must provide for Electrical Engineering Safety matters in the emergency management system. The need for details of where and how to remove power from the mine or part of the mine, a building or a structure in the event of any emergency that requires the disconnection of electricity will be a feature of most emergency preparedness plans. Emergency stop buttons should be installed to enable non-electrical personnel to disconnect power before fire fighting. Fire and emergency provisions to include safe removal of power, rescue from contact with energised conductors, specific fire fighting requirements for electrical installations, provision of communication systems, signage, plans etc. Provisions for the treatment and transport of people who have received an electric shock or burns or arc blast injuries. Some points to consider for inclusion in electric shock protocols: 12 lead ECG. Notifiable incident process. Treatment from health care professional. Training for fighting fires on electrical equipment. Emergency fire procedures for electrical equipment. The actions and procedures to be taken by a person who discovers a fire on electrical equipment. Page 51 of 74

52 ILO The procedures to be adopted when emergency services external to the operation are required. This must include electricity supply authorities. The effective communication to all people required to work or travel in the underground parts of the coal operation of the paths of egress from each underground part of the operation (the provision of telephonic means of communication that is Ex ia). The marking of paths of egress so that people can safely travel on them in conditions of poor visibility (where this is electrically powered the appropriate reliability and explosion protection). Sufficient transport or alternate means of escape in combination with escape equipment to allow the safe evacuation of people (electrical matters may include explosion protection requirements, provision of alternate power supplies, withdrawal of battery powered equipment that does not have an EPL Ma). The regular testing as to the effectiveness of the emergency provisions to be part of life cycle management of electrical equipment. Underground operations accessed by powered winding systems should consider the effects of the requirement to remove power in the event of a ventilation failure on the ability to provide transport of persons from the mine in the event of a prolonged ventilation failure. MESHCM/2006 Section 16 Mine Fires, in particular 16.2(2) Fire warning, p ESCAPE AND RESCUE PLAN AND FIRE FIGHTING PLAN CMHSR, Clause 47 Escape and rescue plan The escape and rescue plan of the underground parts of the operation to include location of high voltage and low voltage fixed cables and switchgear, location of communication devices and interconnecting cable routes, location of monitoring devices and associated cable routes HIGH RISK ACTIVITY CMHSR, Clause 49 High risk activities, waiting periods and information required Cutting or welding in a hazardous zone underground. EEMP to provide for electrical standards and practices for electrical welding or cutting and the application for exemption provisions. Installation of a booster fan underground. EEMP to provide life cycle management details, appropriate SIL for electric power interlocks and registration requirements. The introduction for the first time of a vehicle with a non-flameproof (fire protected) diesel engine to an underground part of a coal operation that is not a hazardous zone. The EEMP must provide for life cycle management of electrical parts of a fireproof diesel engine and the appropriate SIL of any safeguards on the vehicle. The EEMP must identify performance specifications for the design of equipment to prevent the vehicle entering a hazardous zone. For single entry development, the risk assessment may identify increased risks and the need for additional risk controls or more reliable risk controls to be put in place. The EEMP should specify the risk control requirements and any increased reliability and incorporate these in electrical standards of engineering practice for electrical plant, monitoring devices, communications and electrical protection settings. Page 52 of 74

53 4.3.7 ALUMINIUM OR LIGHT METAL ALLOYS CMHSR, Clause 66 Aluminium or light metal alloys With regard to electrical equipment for use in hazardous zones only aluminium portable (hand-held) equipment that has been certified for Group I use can be used. (This relates to requirements specified in the latest Australian Standards relating to explosion protected equipment.) This portable apparatus must also be used in accordance with the EEMP (part of which is a scheme for the use of portable apparatus). Non-portable electrical equipment that is constructed of aluminium or light metal alloy must not be used in a hazardous zone as it can not be certified for Group I. The EEMP must make provision for the use of aluminium cased electrical equipment for use in non-hazardous zones, that ensures: The use of aluminium is limited to those applications that may be justified on the grounds of safety. Aluminium articles are not left unattended in the underground parts of the operation. Aluminium articles are not taken or do not remain anywhere on the inbye side of the first cut-through outbye a longwall face or the last line of open cut-throughs in a panel or a distance of 100 metres outbye a longwall face or last line of open cutthroughs in a panel, whichever is the larger area. That aluminium articles are not taken into or do not remain in an atmosphere containing more than 1.25 per cent of methane. That aluminium articles are not used in any impact process or other application where an incendive spark is likely to occur. That aluminium articles that are not in use or intended for use are removed from the underground parts of the operation. That as far as practicable any aluminium article to be taken underground is clearly and durably marked to the effect that it is aluminium (or a light metal alloy) and its use underground is subject to restrictions. That a register is maintained at the operation recording all aluminium articles taken underground at the operation and the application to which they will be put and their return to the surface of the operation. No external components of electric exploders contain aluminium LASERS CMHSR, Clause 71 Lasers The EEMP must contain requirements for lasers to be used in accordance with Australian Standard AS Safe use of lasers in the building and construction industry, and that Class 3B or Class 4 lasers or laser products as defined in AS/NZS :1997 Laser safety: Equipment classification, requirements and user s guide, are not used DETECTION AND CONTROL OF FIRE ON BELT CONVEYOR CMHSR, Clause 77 Assessment of risk of fire on belt conveyor CMHSR, Clause 78 Detection and control of fire on belt conveyor Page 53 of 74

54 EEMP to provide for life cycle management of electrically powered fire detection systems in reclaim tunnels and enclosed spaces. The detection system will need an appropriate SIL WORKING ALONE IN THE UNDERGROUND PARTS OF AN OPERATION CMHSR, Clause 84 Working alone in the underground parts of an underground mine The EEMP must provide for the prevention of people doing electrical work alone underground unless they are assessed as competent by the operator to do so and the person agrees to undertake that form of work CONSTRUCTION WORK & CONSTRUCTION ZONES OHSR, Clause 64(2) Electrical articles used in construction work All electrical articles that are used in construction work are regularly inspected, tested and maintained by a competent person to ensure they are safe for use if the articles are supplied with electricity through an electrical outlet socket. The EEMP to provide for compliance with AS INFO Workcover CoP Electrical practices for construction work 4.4 Electrical Engineering Management Plan and OH&S regulations requirements The EEMP will need to identify the electrical equipment containing asbestos and ensure the register is kept up to date with regard to its location and condition and that the register complies with the specified requirements of the OH&S regs. The EEMP will need to provide electrical input and requirements to comply with the Use of Places of Work provisions particularly in relation to switch rooms, substations, switchyards and places where electrical equipment is located, especially underground. Typical matters are fire suppression, emergency egress, adequate access, pressure relief venting, provision for remote switching and authorisation to enter. The EEMP will need to provide electrical input and requirements to comply with the Working Space provisions particularly in relation to switch rooms, substations, switchyards and places where electrical equipment is located, especially underground and on mobile plant. Many standards specify minimum requirements. The EEMP will need to provide electrical input and requirements to comply with the Lighting provisions. The EEMP will need to provide electrical input and requirements to comply with the Personal Protective Equipment provisions in particular clothing for electrical work, special clothing for switching operations and height safety. The EEMP will need to consider the requirements for electrical equipment and personnel with regard to the OH&S provisions for: Heat and cold. Noise management. Atmospheric contaminants. Levels of oxygen. Ventilation (localised). Page 54 of 74

55 Protection against entry into a contaminated atmosphere or unsafe levels of oxygen. Atmospheric monitoring (localised). Working at heights (OHL s, lighting towers are a particular electrical issues, the issue of electric shock causing a fall and pole top rescue must be considered). Falling objects. Lifts. Brittle or fragile roofs. Building maintenance. Fire and explosion. Working in confined spaces. Manual handling. Hazardous substances: o Asbestos (can be found in dc motors, old switchboards, old meter panels, old switchgear). o PCB s. o Electrical solvents. o Inclusion on the register of hazardous substances at the coal operation. Dangerous goods particularly electrical ignition sources and identification and classification of hazardous areas. Spray painting - particularly electrical ignition sources and identification and classification of hazardous areas and use of any booths. 4.5 Duties relating to contractors With regard to contractors engaged to do electrical work the EEMP must provide electrical content and or actions to be undertaken. Also refer to section In particular: Pre-assessment of contractor electrical engineering health and safety arrangements (including safety management, competence of people and fitness for purpose of equipment) prior to engagement. Pre-assessment of electrical contractor s competency. Site induction relating to Electrical Engineering Safety requirements for contractors, contractor employees and subcontractors. Monitoring of contractor compliance with site Electrical Engineering Safety health and safety requirements, including legislative compliance. Although specific types of contractors are excluded by regulation the EEMP must make provision for Electrical Engineering Safety health and safety requirements of all persons whose activities may involve the use of electrical equipment or to be in proximity to part of an electrical installation: Delivery contractors typical matters may cover fuel delivery, delivery of large equipment, use of remote control vehicle cranes, power systems on board delivery vehicles etc. Office equipment service contractors typical matters will be competency, isolation, use of meters etc. Office cleaning contractors typical matters are fit for purpose equipment and testing and tagging of equipment. Page 55 of 74

56 Catering contractors particularly where electrically powered equipment is used on site Other contractors engaged in similar work. Page 56 of 74

57 Chapter 5 Maintenance of electrical installations & equipment CMHSR, Clause 19(1) (a), (d), (e) & (n) Electrical engineering management plan OHSR, Clause 41(3) Electricity particular risk control measures OHSR, Clause 64(2) Electricity particular risk control measures Electrical installations and equipment have to be maintained in a safe condition, by people who are competent to do the work and recognise when electrical engineering safety risk controls have been compromised. Consideration of the impact of hostile environments must be taken into account when determining maintenance activities and frequency of inspection. An EEMP must include arrangements for maintenance of an electrical installation at a NSW coal operation. This may be integrated into a Maintenance Management Plan. Other matter that may also be addressed is the calibration of gas detecting instruments. Apart from the above clauses, Chapter 5 Plant Safety of the OHS Regulation will need to be considered. All parts of an electrical installation must be maintained so as to ensure that: The safe and satisfactory operation of the installation is not impaired by interference, damage, ageing or wear. The live parts of the installation remain properly insulated or protected against inadvertent contact with any person. The earthing system for the installation operates effectively. The installation is not used in a manner that exceeds the operating limits imposed by its design or installation. The installation does not become a significant potential cause of fire for the environment surrounding the installation4. Protection Devices will perform as expected by utilizing regular testing. Earthing systems will perform as expected by utilizing regular testing. Compliance with the regulations. Electrical Explosion protected equipment is maintained in an explosion protected condition. Electrical safeguards are assigned suitable functional safety ratings, and their SIL is maintained and verified The maintenance scheme should be developed, implemented and periodically reviewed by a qualified electrical engineer. Maintenance actions on electrical installations should only be undertaken by: A qualified engineer; A qualified tradesperson; or Persons under the supervision of a qualified engineer or tradesperson. The EEMP will need to specifically address: 4 These outcomes are specified in the ECSA For information on the Electrical Engineering Management Plan at a coal operation refer to the CMHSA 2002 and Regulation. Page 57 of 74

58 All electrical installations at a place of work are inspected and tested after they are installed and prior to their energising for normal use by a competent person to ensure they are safe for use. All electrical installations at a place of work are maintained by a competent person to ensure they remain safe for use. The necessary facilities and systems of work are provided and maintained so as to minimise risks to health and safety of persons maintaining, inspecting, altering, repairing or cleaning the plant. Inspections, maintenance and cleaning are carried out having regard to procedures recommended by the designer or manufacturer or developed by a competent person. All safety features and warning devices of plant are maintained and tested. This will be an integral part of maintaining the SIL and will require the identification of safety related functions and systems. If plant has been damaged to the extent that its operation or condition is impaired and the risk to health or safety is increased a competent person assesses the damage and provides advice on: o The nature of the damage. o Whether the plant is able to be repaired and, if so, what repairs must be carried out to minimise risks to health and safety. o Repair, inspection and, if necessary, testing is carried out by a competent o person. Repairs to the plant are carried out so as to keep the plant within its design limits. If access to plant is required for the purpose of maintenance, cleaning or repair the plant is stopped and the following measures (as a minimum) are used to control risks: o Lockout or isolation devices. o Discharge residual or stored energy. o Danger locks/tags. Permit to work systems should be used where isolation requirements are complex, involve high energy systems or include a number of people. All electrical articles that are supplied with electricity through an electrical socket outlet are regularly inspected, tested and maintained by a competent person to ensure they are safe for use. All electrical articles that are supplied with electricity through an electrical socket outlet that are at a place of work where the safe operation of the electrical article could be affected by a hostile operating environment are regularly inspected, tested, tagged and maintained by a competent person to ensure they are safe for use. All electrical installations and electrical articles at a place of work that are found to be unsafe are disconnected from the electricity supply and are repaired, replaced or permanently removed from use. Appropriate work systems are provided to prevent inadvertent energising of plant connected to the electricity supply. A record is made and kept of all inspections and tests made and maintenance carried out on electrical articles and electrical installations. The following information is to be recorded: Page 58 of 74

59 o The name of the person who made the inspection or carried out the test or maintenance. o The date on which or dates over which the inspection was made or the test or maintenance was carried out. o The result or outcome of the inspection, test or maintenance. o The date by which the next inspection and test must be carried out. INFO Also refer to sections 3.5 and ILO MESHCM/2006 Section Electricity Hazard control General provisions intervals and methods of inspection for electrical equipment, p120 ILO MESHCM/2006 Section Electricity Hazard control General provisions- electrical maintenance plan, p Page 59 of 74

60 Chapter 6 Technical matters to consider for SEP s. 6.1 Control Circuits On new installations where control circuits have field devices that can be touched whilst energised the control circuit shall be supplied at ELV. On existing installations where low voltage control circuits have field devices that can be touched whilst energised the control circuit shall be protected by an earth leakage device (RCD) having a trip setting at 30 milliamperes or less. At the first opportunity (e.g. plant upgrade) non-elv control circuits should be replaced with ELV control circuits. 6.2 Electrical cord extension sets OHSR, Clause 64(2) (f) Electricity particular risk control measures The OHS Regulation has particular requirements about the location and use of flexible cables and associated fittings. Any electrical cord extension sets, flexible cables or fittings are located where they are not likely to be damaged (including damage by liquids) or are protected against any damage, and are not laid across passageways or access ways unless they are suitably protected 6.3 Safe access to electrical equipment OHSR, Clause 41(b) Electricity particular risk control measures The OHS Reg has particular requirements for ensuring non-electrically qualified persons can t access electrical equipment where there are exposed energised conductors. Electrical installations containing live electrical components (such as control panels, switch rooms, switchyards and substations) are suitably secured to prevent inadvertent access 6.4 Underground Installations LOCATION OF SWITCHGEAR & TRANSFORMER SUB STATIONS (OTHER THAN DCB S AND LONGWALL PANTECHNICONS) Should be housed in a room or cut through set aside for the purpose. Should be fitted with fire alarms and fire extinguishing equipment automatic fire detection and suppression may be required where electrical equipment contains flammable fluids. Should have provision for the removal of power in an emergency (emergency stop on the intake side of the room or cut through). The location shall have good roof and rib support. The location shall be well ventilated. The location shall be well clear of moving traffic. The location shall be such that persons operating, inspecting or maintaining the switchgear shall be well clear of moving traffic. There shall be adequate access to the switchgear for operational, inspection and maintenance purposes. Page 60 of 74

61 The area shall be free of slip, trip and fall hazards. There shall be two egress points or there shall be sufficient space from the switchgear to effect safe egress. Permanent lighting shall be provided. High Voltage switchgear and transformers are not to be located in wet areas in particular near or in pools of water. Consideration should be given to installing remote operation capabilities. There shall be no combustible material stored in the room or cut through. Where the equipment contains combustible liquid the ventilation should have provision for short circuiting to the return airway in the event of a fire. Access shall be for authorised personnel only. ILO VEHICLE/MACHINERY BATTERY CHARGING STATIONS Shall not be in a hazardous zone. Shall be housed in a room or cut through set aside for the purpose. Should be fitted with fire alarms and fire extinguishing equipment. Should have provision for the removal of power in an emergency (emergency stop on the intake side of the charging station). The location shall have good roof and rib support. Where coal roof and ribs are exposed they shall be covered in a non flammable material. The location shall be well ventilated and any gases liberated from the battery during charging shall be ventilated directly to a return airway. The room or cut through shall be subject to a hazardous area classification study. Where hazardous areas are identified any electrical equipment used in those areas shall be certified suitable for Group I and the appropriate gas grouping. The location shall be well clear of moving traffic other than for the vehicle having its battery charged. The location shall be such that persons operating, inspecting or maintaining the charging equipment are well clear of moving traffic. There shall be adequate access to the charging equipment for operational, inspection and maintenance purposes. The area shall be clean and free of slip, trip and fall hazards. There shall be two egress points or there shall be sufficient space from the charging equipment and equipment being charged to effect safe egress. Permanent lighting shall be provided. Adequate drainage shall be provided to prevent pooling of water. There shall be no combustible material stored in the room or cut through. MESHCM/2006 Section 10.7 Storage-battery locomotives and battery equipment, p FIXED CABLE INSTALLATIONS Low Voltage and High Voltage Cables shall be: Of a design that considers the harsh mining environment, rating, capacity, termination, regular testing, installation and retrieval. Hung clear of the floor for their entire length. Adequately supported (sufficient cable hanging points). Page 61 of 74

62 Be at a height above that of the profile of the largest machine or vehicle that may pass in the vicinity. Clear of moving traffic where the cables enter electrical switchgear consideration of vehicles/machinery losing control and potentially striking cables shall be taken into account. High voltage cables shall have warning signs or tapes fitted at regular intervals. Cable joints shall be adequately supported. Where cables cross roadways with regular vehicular traffic they shall be either well clear of the travelling profile of the largest vehicle or mechanically protected from damage. Where cables cross any roadways they shall be clearly signed. Unused cables shall not have any exposed conductors whilst in situ. Unused High voltage cables with plugs should have end caps fitted Unused cables shall not be left in areas that are to be sealed. Communication and Data Transmission Cables shall be: Of a design that considers the harsh mining environment, rating, capacity, termination, regular testing, installation, retrieval and where necessary suitable for any intrinsically safe applications. Hung clear of the floor for their entire length. Adequately supported (sufficient cable hanging points). Be at a height above that of the profile of the largest machine or vehicle that may pass in the vicinity. Clear of moving traffic where the cables enter communication and data transmission equipment. Cable joints shall maintain any intrinsic safety properties. Where the cables are part of safety critical or emergency management equipment, consideration of maintaining a high reliability shall be given. Unused cables shall not have any exposed conductors whilst in situ. Unused cables shall not be left in areas that are to be sealed. Page 62 of 74

63 INFO Electrical Accident Investigation and Reporting The EEMP should identify the requirements for the investigating and reporting electrical incidents and accidents. Some electrical incidents will be reportable or notifiable to Industry and Investment NSW. Some electrical incidents may need to be reported to the Director-General of the Department of Energy, Utilities and Sustainability under section 63R of the Electricity Supply Act. In some cases, where an incident is related to an electrical article, an operator of a coal operation may wish to make a report to the Office of Fair Trading. In any case the EEMP should include requirements for responding to electrical incidents. These requirements should include: Measures for ensuring the safety of persons and property. Measures for removal of a trapped or injured person or to remove a body. Incident scene preservation. Statutory reporting requirements. Internal investigation requirements. Remedial actions. Dissemination of information. The EEMP should specify the minimum competencies for persons who have a duty under this chapter. Generally when a person receives an indirect shock there has been a failure of multiple barriers especially earthing arrangements, protection arrangements, selection (environment) issues and maintenance issues systemic failures that must be addressed Where back up protection operates to clear a fault, this implies the primary (first) level of protection has failed need to determine if this is the case. Notification of certain incidents is specified in the regulations. All these can have electrical energy sources as a root cause. Typical electrical causes for injuries are: Electric shock, a fall as a result of an electric shock, arc blast, plasma, severe electrical burns, unintended activation or movement of equipment. All electric shock victims should receive medical care from a health care professional. Typical near misses that may have electrically related causation are: Where a vehicle, machinery or other plant makes contact with an energised high voltage source involving a risk to any person - any contact between machinery and energised high voltage conductors (cables and/or overhead power lines) is considered as involving risk to persons. An uncontrolled explosion or fire with an electrical ignition source or a misfire of explosives. A collision involving a heavy vehicle or other large plant on the surface. The loss of control of a heavy vehicle or other large plant on the surface. Failure of any part of a powered winding system or damage to a shaft or shaft equipment. Other reportable matters that may have an electrical causation. Page 63 of 74

64 A spill or incident resulting in exposure or potential exposure of a person to a notifiable carcinogenic substance or a prohibited carcinogenic substance, PCB s or asbestos in electrical equipment. Contact of a person with an energised electrical conductor or other energised electrical item that is supplied at above extra low voltage - here the source voltage is used for the determination of the voltage level. An accumulation of gas that requires the withdrawal of people or results in the tripping off of electric power. An event that occurs in a hazardous zone in the underground parts of the coal operation and from which an electric arc is observed or that leaves visible evidence on an electric cable of arcing. The in-service failure of the explosion-protection characteristics or flame-proofing characteristics of explosion-protected plant. Page 64 of 74

65 Appendix A - Revisions to EES-001 CHANGES: General changes to this document of an editorial nature to clarify certain points. Integration of OHSR requirements Inclusion of information from EES-002 Control and Supervision of Electrical Work Specific changes to this document are: Preface Additional comment on electrical engineers Chapter 1 Establishment Section 1.3 Removal of the reference to EESOO2 Section 1.5 Definitions Additional definition Manager of Electrical Engineering Additional definition Qualified Supervisor Section 1.8 Referenced standards and guidelines Additional standards referenced (AS/NZS3019, AS/NZS3190) Additional MDG referenced (MDG5002) Additional handbook referenced (HB242) Section 1.9 Acronyms additional acronyms added Section 1.12 NEW SECTION Electrical installations Inclusion of OHSR Clause 33 definition and information from Section 2.1 (Electrical installations) & 2.2 (Mining electrical installations) of EES-002 Section 1.13 NEW SECTION Automotive electrical installations Inclusion of information from Section 2.3 (Automotive electrical installations) EES-002 Chapter 2 Health and Safety Management Systems and the Electrical Engineering Management Plan Section 2.1 Introduction Reference to CMHSA, 23(3) (e), OHSR Clauses 41 & 64 Additional information relating to Managers of Electrical Engineering Deleted the drawing showing the relationship between OHS Management Systems, CMHSR and OHSR Section Health and Safety Management System Planning Identification of Hazards, Risk Assessment and Control of Risk Reference to OHSR Clauses 9 & 10 Page 65 of 74

66 Reference to MESHCM/2006 Section Health and safety management system Structure and Responsibility - Resources Reference to MESHCM/2006 Section Health and safety management system Structure and Responsibility Responsibility and accountability Reference to MESHCM/2006 Section Health and Safety Management System Management Plans Inclusion of certificate of competence engineers (previously only mentioned CPEng) Additional information relating to Electrical Engineers Section Health and Safety Management System Structure and Responsibility Responsibility and Accountability Inclusion of certificate of competence engineers (previously only mentioned CPEng) Inclusion of Section 4.1 (Authorisations and Appointments) EES-002 Section Health and Safety Management System Structure and Responsibility - Training and competency Referenced OHSR Clause 41 Inclusion of Section 4 (General Competencies for electrical work) & 4.4 (Training and Instruction) EES-002 Section Health and Safety Management System Document and Data Control Referenced OHSR Clause 41 Additional information on software management. Section Health and Safety Management System Hazard Identification, Risk Assessment and Control of Risks Referenced OHSR Clauses 9 & 10 Additional information on specifying safety requirements Section Health and Safety Management System Incident Investigation, Corrective Action and Preventative Action Referenced OHSR Clause 64 Inclusion Section Records and records management Title corrected Referenced OHSR Clause 65 Chapter 3 Electrical Engineering Management Plan Section 3.1 Objectives Inclusion of OHSR Clause 92 requirements for emergency stops, and associated comment Section 3.2 Management Structure Inclusion of Electrical Engineers qualifications Mine Electrical Engineers Certificate of Competence Page 66 of 74

67 Additional information on hazardous area competencies Deleted reference to EES-002 Section 3.3 Scope of electrical engineering management plan has additional information about incorporation of the specific electrical requirements of the OHSR Section 3.4 Plant Safety Reference to MESHCM/2006 Section Plant registration Reference to MESHCM/2006 Section Specific Plant Requirements Inclusion of OHSR Clause 64 requirement for plant not to be used where there are electrical hazards Additional information on radio controlled and software controlled plant Referenced MDG5002 Reference to MESHCM/2006 Section 3.5 Electrical work and practices Section NEW SECTION Basic requirements Inclusion of basic information in relation to electrical work at coal mines it is taken from EES-002 Reference to MESHCM/2006 Section RE-NUMBERED & RETITLED SECTION previously Qualifications Inclusion of information on two years experience for electrical tradespersons Additional information on hazardous area installations Additional information on electrical apprentices Section NEW SECTION.Supervision Inclusion of basic information in relation to supervising electrical work, it is based on EES-002. Section NEW SECTION.Work under the supervision of a qualified electrical engineer Inclusion of basic information in relation to supervising electrical work by a qualified electrical engineer, it is based on EES-002. Section NEW SECTION.Work under the supervision of an electrical engineer in the management structure (who is not a qualified electrical engineer) Inclusion of basic information in relation to supervising electrical work by an electrical engineer nominated in the management structure, it is based on EES-002. Section NEW SECTION.Work under the supervision of a qualified electrical tradesperson Inclusion of basic information in relation to supervising electrical work, it is based on EES-002. Section NEW SECTION.Work where the coal operation is a surface operation with a small electrical infrastructure Inclusion of basic information in relation to the use of part-time electrical engineers, it is based on EES-002. Section NEW SECTION.Work on ELV automotive installations Page 67 of 74

68 Inclusion of basic information in relation to automotive electrical work, it is based on EES-002 & EES-013. Section NEW SECTION.Work on 240 volt plug-in equipment Inclusion of basic information in relation to test and tag type work, it is based on EES-002 & EES-013 Section RENUMBERED SECTION.formerly Inclusion of basic information in relation to test and tag type work, it is based on EES-002 & EES-013 Section NEW SECTION Safe Systems of Work Inclusion of OHSR Clause 207 requirement for work on electrical installations to be carried out using a safe system of work with specific measures to be taken. Section NEW SECTION Safety observers Inclusion of basic information on where safety observers may need to be used it is based on EES-002 Section NEW SECTION Isolation arrangements Inclusion of OHSR Clause 207 requirement not to work on energized circuits and apparatus Old section included Inclusion of OHSR Clause 64 requirement for to prevent inadvertent energisation. Referenced HB242 Section RE-NUMBERED SECTION previously Prohibited Practices Old section included Explanation of the success of no live work in NSW coal mines Inclusion of OHSR Clause 207 Explanation of DPI actions in the event a mine desires to work on energized conductors. Section RE-NUMBERED SECTION previously Commissioning and testing Inclusion of OHSR Clause 64 requirement for inspection & testing after installation Alignment with AS/NZS3000 Section NEW SECTION Electrical testing safe methods Inclusion of OHSR Clause 64 requirement for inspection & testing after installation Incorporation of old section Use of electrical testing instruments Section Hazardous area / zone installations NEW SECTION Based on EES-002 Section Reporting and recording of test results NEW SECTION Based on EES-002 Incorporates OHSR Clause 65 Section High Voltage Practices Inclusion of additional information from EES-002 Page 68 of 74

69 Inclusion of old section requirements Section RENUMBERED SECTION formerly Old Section Other considerations DELETED (This had the OHSR requirements in it; all these requirements are now integrated within specific sections of this document. Section 3.6 Standards of Engineering Practice Inclusion of OHSR Clause 41 requirement for to prevent unauthorized access to electrical equipment. Referenced AS/NZS4761 Section 3.9 Static Electricity Reference to MESHCM/2006 Section 3.10 & 3.11 RETITLED SECTION & NEW SECTION RETITLED 3.10 Electrical Protection, (Section 3.10 used to be titled Electrical protection and earthing Inclusion of information relating to earth continuity and earth fault lockout protection. Additional information on short circuit protection and associated studies. Additional information on testing earth leakage protection. Additional information on safety integrity of protection systems. Reference to MESHCM/2006 Section 3.11 Earthing NEW Additional information on using resistive limitation instead of reactive limitation and the first fault should be a low energy earth fault. Section 3.12 RENUMBERED SECTION Switching electrical power FORMERLY 3.11 Inclusion of information relating to actions to be taken after a fault trip Additional information on considerations for mine winders Additional information on considerations for ventilation failures Reference to MESHCM/2006 Section 3.13 Use of portable apparatus RENUMBERED SECTION Formerly 3.12 Section 3.14 Specific procedures RENUMBERED SECTION Formerly 3.13 Inclusion of OHSR Clause 41(4) requirement to prevent people doing non-electrical maintenance from coming into close proximity of overhead lines or live installations Moved content relating to electric shock protocol and put in section Electric Shock Protocol content not changed Use of electric welding equipment RENUMBERED Formerly Section Use of electrical test instruments RENUMBERED Formerly Section Page 69 of 74

70 refers back to section Section Electric shock protocol NEW SECTION content taken from old section Emergency Management System. Section 3.15 Overhead lines and cables and underground (buried) cables RENUMBERED & RETITLED Formerly Section 3.14 Inclusion of OHSR Clause 64 requirement to prevent inadvertent contact with overhead lines and buried cables Inclusion of OHSR Clause 241 requirement to control risk from contacting electric cables during excavation advice on buried cable management Section 3.16 Signage and plans RENUMBERED Formerly Section 3.15 Inclusion of OHSR Clause 64 requirement for signs Reference to MESHCM/2006 Chapter 4 Electrical Engineering Management Plan, other management plans and regulatory requirements Section Monitoring arrangements and ventilation arrangements Referenced MESHCM/2006 Section Emergency Management System Additional information on electrical considerations during an emergency Referenced MESHCM/2006 Section High Risk Activities Additional information on fireproof diesels Additional information on single entry developments Section RETITLED to Construction Work and Construction Zones Inclusion of OHSR Clause 64(a2) requirement for electrical articles used in construction work Chapter 5 Maintenance of electrical installations and equipment RETITLED Inclusion of OHSR Clause 41 requirements for maintenance of electrical equipment Inclusion of OHSR Clause 64(2) requirement for electrical maintenance, inspection and testing Referenced MESHCM/2006 Chapter 6 Technical matters to consider for SEP s Section 6.3 Safe access to electrical equipment NEW SECTION Page 70 of 74

71 Inclusion of OHSR Clause 41 requirement for access to electrical equipment Section 6.4 Underground installations RENUMBERED formerly Section 6.3 Section Vehicle/machinery Battery Charging Stations Referenced MESHCM/2006 Section Fixed cable installations Inclusion of SAGO disaster recommendations of not leaving cables in sealed areas Additional information on disconnected HV cables Page 71 of 74

72 FEEDBACK SHEET Your comments will be very helpful in reviewing and improving this document. Please copy and complete the Feedback Sheet and return it to: Senior Inspector Electrical Engineering Mine Safety Operations Industry and Investment NSW PO Box 344 MAITLAND NSW 2310 Fax: (02) Phone: (02) How did you use, or intend to use, this Technical Reference? What do you find most useful about this Technical Reference? What do you find least useful? Do you have any suggested changes to the Technical Reference? Page 72 of 74

73 Thank you for completing and returning this Feedback Sheet. Page 73 of 74

74 Chapter 7 I&I NSW Contact Details I&I NSW Mineral Resources offices located in coal mining regions North East Area Maitland South East Area Lithgow 516 High Street Suite 1, 1 st Floor, 184 Mort Street Maitland NSW 2320 Lithgow NSW 2790 PO Box 344 Phone: (02) Hunter Regional Mail Centre NSW Fax: (02) Phone: (02) Fax: (02) Singleton Level 1, 1 Civic Avenue Wollongong Level 3, Block F, 84 Crown Street Singleton NSW 2330 Wollongong NSW 2500 PO Box 51 PO Box 674 Singleton NSW 2330 Wollongong NSW 2520 Phone: Phone: (02) Fax: Fax: (02) Page 74 of 74