Design Guide Part 6: General requirements for electrical systems

Design Guide Part 6: General requirements for electrical systems RIBA Stages 3 7 2016 V1.0 Green Cover Phillip Hunt (EST) phillip.hunt@uea.ac.uk Estates & Buildings Division, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 1 of 47

Contents 1 Introduction... 5 Prior Reading... 5 Purpose of the UEA Design Guide... 5 Purpose of this section of the Design Guide... 5 Interpretation... 5 Structure of this Part of the Design Guide... 6 Scope... 6 2 Requirements for All Electrical Systems... 7 Introduction... 7 Key Principles and Requirements... 7 Building Electrical Load Assessment... 8 Operational Procedures... 9 Integration with the campus s Building Management System (BMS)... 9 Testing, Commissioning and Documentation... 10 3 High Voltage Systems... 11 Introduction... 11 Key principles and requirements... 11 Preferred Material, Technology and Solutions for HV systems... 11 Suggested Schematics for HV systems... 16 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 2 of 47

Applicable Standards and Best Practice Guides for HV Systems... 16 4 Low Voltage Systems... 19 Introduction... 19 Key Principles and Requirements... 20 Preferred Materials, Technology and Solutions for LV Distribution Systems... 21 Suggested Schematics for LV Distribution Systems... 31 Applicable Standards and Best Practice Guides for LV Distribution Systems... 31 Preferred Materials, Technology and Solutions for Single Phase Power Distribution 32 Motor Control Centres... 33 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 3 of 47

Preferred Materials, Technology and Solutions for Lamps and Luminaires... 35 Suggested Schematics for Lamps and Luminaires... 47 Applicable Standards and Best Practice Guides for Lamps and Luminaires... 47 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 4 of 47

1 Introduction Prior Reading It is imperative for readers of this document to first refer to the introductory Part entitled: Design Guide Part 1 Principles and overview. Part 1 gives vital information and context that apply to all projects. Purpose of the UEA Design Guide The Design Guide (as a whole) is written for employees of the UEA, architects and external consultants and contractors. The purpose of the Guide is to act as a briefing document to give designers an overview of the design requirements, constraints and challenges presented by the UEA s specialist needs. It applies to all new-build and refurbishment projects controlling quality in the production of designs, specifications and the subsequent performance of buildings. The Design Guide aims to discuss strategic matters and does not provide an exhaustive treatment of statutory or best practice design and compliance requirements; its primary purpose is to establish a starting point for design briefs. It is the responsibility of readers/duty holders to ensure subsequent designs are complete, compliant and able to meet the final approved brief when measured in use. Purpose of this Part of the Design Guide This Part of the Design Guide is written for designers and specifiers of electrical systems from the Developed Design Stage (RIBA Stage 3) to when the building is in use (RIBA Stage 7). Interpretation Any part of the Design Guide may be referenced in project contractual documentation in order for the UEA to control quality. The following interpretations apply: Enforced requirements; the use of the word(s) shall, are required, is required must or will be denotes a requirement that is non-negotiable and shall be used as the basis for designs, technical submissions and/or activities. If such a statement conflicts with a statutory obligation then a report to the Head of Engineering and Infrastructure shall be produced highlighting the conflict, for his or her final decision regarding compliance. Requirements needing confirmation; the use of the word may denotes a negotiable requirement or indication of a solution, where innovation and further calculation, design and discussion may be required to arrive at an optimised solution. Quality; the Design Guide aims to arrive at the UEA s highest design aspirations and standards. It may be that, at the UEA s sole discretion, solutions are value engineered during subsequent design iterations. Designers are encouraged to consider where value engineering may result in an improved financial performance should funding constraints occur. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 5 of 47

Currency of third party documents; where superseded standards and regulatory documents are referred to in the text, the reader shall apply current versions and disregard superseded versions. Proof; where the word proof is used e.g. proof is required, a written report or installation certificate must be produced for approval depending on context. Approval and proof; all designs shall be approved by the UEA. Approval shall be interpreted as meaning written approval from either the UEA s appointed approving authority or by the Head of Engineering and Infrastructure where no other approving authority is appointed. Approvals shall be sought prior to design decision points or installation activities (depending on context) and shall be made in writing. Where approvals are sought, a written technical submission shall accompany the request setting out, with proof (e.g. calculations, drawings), the case for the approval. The purpose of the approval process is to ensure designs meet the strategic requirements of the UEA. The obligations owed by external architects, consultants and contractors to UEA and their liabilities to UEA is not in any way diminished or otherwise reduced by the approval process. UEA is not taking over the roles and duties of the external architects; consultants and contractors who will remain fully and totally responsible for the design and/or works carried out by them or on their behalf by their staff; agents; sub-consultants or sub-contractors. Structure of this Part of the Design Guide The separate sections of this Part of the Design Guide are: High Voltage Systems Low Voltage Systems including Lighting Each Section includes the following sub-headings: Introduction Key principles and requirements Preferred material, technology and solutions; this section describes how the key principles and requirements might be met Suggested schematics Applicable standards and best practice guides Scope The scope of this document is concerned with electricity distribution systems and not regarding electricity for data, communication, alarm or lightning conductors which are covered by other parts of the Design Guide. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 6 of 47

2 Requirements for All Electrical Systems Introduction The principles and requirements detailed below are of strategic importance and apply to all electrical systems, mainly with regard to environmental performance and cost efficiency. Key Principles and Requirements All electricity at the UEA shall be sourced, where technically and financially feasible, from the campus s privately owned high voltage and low voltage distribution network. The network distributes a mix of electricity imported from the grid as well as electricity generated by on-site gas CHP engines and so its use delivers carbon and cost saving benefits. With regards to wiring regulations, electricity distributed by the UEA s private network shall be treated as conventionally distributed electricity, except that the UEA requires reduced voltage drops as detailed below. Carbon emission factors for domestic buildings shall be derived from SAP 1 and for buildings other than dwellings they shall be derived from DEFRA 2 s Government conversion factors for company reporting at http://www.ukconversionfactorscarbonsmart.co.uk/ using Scope 1 (direct emissions) and Scope 2 (indirect emissions from purchased energy) carbon factors. Advice should be sought from the UEA s Head of Energy and Utilities before formal submissions are made. The UEA purchases electricity at 11 kv and distributes it across most of the campus via its own 11 kv network. Therefore, all modifications and/or additions (such as new buildings) to the UEA s 11 kv network are arranged by the UEA and not the Distribution Network Operator 3 (DNO). Low voltage 4 (LV) distribution systems supplied by the UEA s 11 kv network are TN- S arrangements, nominally at 400V ac (under load). Some buildings at the campus s periphery are supplied by the DNO s 11 kv network; different earthing and protective conductor arrangements may exist for these buildings. Voltage drop in LV systems shall not exceed 3% for lighting and 5% for other uses as measured from the sub-station LV distribution panel. Electricity conditioning measures such as voltage optimisation (VO), power factor correction (PFC) and harmonic filtering shall be applied to the LV network immediately after transformer step-down. Certain buildings and or appliances cannot tolerate power failure e.g. buildings or systems supporting research projects. In such instances an uninterruptable power supply (UPS) or generator back-up with an parallel operating mode shall be required. 1 HM Government s Standard Assessment Procedure for the Energy Rating of Dwellings 2 Department for Environment, Food and Rural Affairs 3 UK Power Networks in the DNO to the Campus boundary. 4 As defined by BS 7671. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 7 of 47

Such applications may require separate fully maintained circuits as well as circuits that are not maintained by the UPS/generator supply. Wiring systems shall never use twin and earth type conductors (singles are always preferred) and shall always use low smoke and fume type insulation. All cables must be British Approvals Service for Cables (BASEC) approved. The minimum conductor size for all power supply systems (as opposed to alarms or communications, etc.) is 1.5mm² for non-flexible cable and 0.75mm for flexible cable. A comprehensive metering scheme shall be developed that take into account numerous metering requirements as discussed in the sections below. Commissioning to ensure discrimination etc. Flexibility additional capacity. The UEA has highly developed operational procedures for HV and LV systems that must be complied with All parts and workmanship shall be guaranteed for a period not less than 60 months from the date of commissioning. Building Electrical Load Assessment Introduction A quality assessment of a building s electricity demand profile underpins energy and cost efficient design. This section describes the UEA s requirement for such exercises. Key principles and requirements Designers shall develop an hourly electrical load model including profiles for each type of load e.g. lighting, IT, HVAC, small power, etc. The following assessments shall be made by the design using the hourly model: Projected total annual consumption, cost and environmental impact. Benefits of power factor correction and voltage optimisation based on a lifecycle cost analysis. Benefits of reduced voltage drop (and the resulting efficiency losses). The UEA design team shall provide load and profile information to assist with the development of the model. Diversity shall be a consideration of the distribution system design. Diversity factors shall be discussed and approved by the Head of Engineering and Infrastructure. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 8 of 47

Preferred materials, technology and solutions The modelling method shall be based on a dynamic software simulation tool approved in advance by the Head of Engineering and Infrastructure. CIBSE 5 Guide K Electricity in buildings proposes an approach to load assessment that may be used as a starting point for the exercise. NA Suggested schematics Applicable standards and best practice guides CIBSE Guide K - Electricity in buildings Operational Procedures The UEA has evolved a set of operating procedures that ensure safety, efficiency and continuity of business. Key principles of the operating procedures include: Sufficient prior notice of any change to electrical systems e.g. isolations or connections Undergoing a site induction process including provision of risk assessments and method statements A permit to work process Following switching procedures when on site Details of procedures for high voltage and low voltage systems are discussed in the relevant sections below. Integration with the campus s Building Management System (BMS) The campus is controlled and monitored by a Trend building management system connected to all buildings and significant items of plant. Part 5 of the Guide gives detailed guidance regarding the requirements for any new BMS developments or modification to existing systems. BMS data shall be recorded by the BMS database. Suggested schematic DG6.1 shows typically how the BMS is integrated with electrical systems. 5 CIBSE Guide K Electricity in buildings Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 9 of 47

Testing, Commissioning and Documentation Testing and Commissioning The UEA recognises that the design aspirations for any development work can be realised or lost at the testing and commissioning stage. Testing and commissioning often takes place during the final stages of a project when time pressures are greatest, potentially resulting in systems that perform poorly when in use. A commissioning agent will be appointed early in the design process to follow the design and construction throughout the project, reporting on a regular basis on issues that could affect the reliable and efficient running of building services and the subsequent impacts on comfort and safety. The testing and commissioning protocols set out in BS 7671 shall be used. Documentation The UEA requires as built drawings and Building Information Modelling (BIM) models to be made available within the timescales determined at the project brief stage. BIM Level 2, 6D shall be protocol applied and achieved. Retentions will not be released until all contractual obligations have been met and in some cases a damages claim may be the result of late submission. All significant assets (as defined by the Head of Engineering and Infrastructure) shall be recorded by the contractor using the UEA s standard asset capture template. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 10 of 47

3 High Voltage Systems Introduction The UEA owns, operates and maintains a privately owned high voltage (11,000 V hereafter 11 kv 6 ) network which supplies the main campus with electricity via sub-stations, strategically located around the site. The main campus has an 11 kv intake substation supplied by the local Distribution Network Operator 7 (DNO) and this is the main artery supplying the campus. In addition to the DNO supply, the campus has combined heat and power (CHP) generating plant capable of generating 5.7 MVA which feeds into the 11 kv network on the campus side of the intake point. It is possible for the CHP plant to generate sufficient electricity to export but there is an export limit of 950 kw currently in place. Key principles and requirements Key principles and requirements are discussed in the sections below. Preferred Material, Technology and Solutions for HV systems HV system design Type: the UEA s HV network is an 11 kv 3-phase 50 Hz, earthed neutral system. The system is arranged as a series of rings with open points and radials with a total of 20 substations including the intake substation. Calculations; Requests to add additional load or modify any part of the existing HV network must be submitted in writing to the Head of Engineering and Infrastructure for approval. The designer/contractor responsible for the works must demonstrate a clear understanding of the electrical infrastructure by providing the following information: The total additional load to be applied to the HV network. The total additional load on the secondary of the transformer. Adjustments required to the protection grading of HV network. Protection settings; when a new sub-station is added into the existing HV network, or a transformer is replaced, a discrimination study must be undertaken in order to update the protection settings for all affected parts of the system. This study must be presented to the Head of Engineering and Infrastructure for approval at least one month prior to works starting on site. Jointing methods; T jointing is not permitted on any part of the HV network. Where joints are necessary these shall be of the in-line, resin filled type. Cables shall not be crossed or rolled within cable termination boxes unless appropriate screening and stress control arrangements exist or are fitted. 6 IEC60038 defines 11,000 Volts as medium voltage however the term high voltage is entrenched in the UK for 11 kv and so 11 kv is referred to as high voltage throughout this document. 7 Currently UK Power Networks Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 11 of 47

Sub-station construction Generally the construction of a new sub-station shall encompass the following: Be suitably dimensioned to allow free movement around transformers; Have two means of escape; Have blast doors incorporated in the design; Be stand-alone construction; Have cable ducts installed for HV and LV cables; Incorporate gravel traps; Be fit for purpose; Equipment to be provided within each sub-station: Key Cabinet containing safety padlocks. First aid box. Telephone. Diagram of the HV network. Safety signs - Caution notice. Safety Locks. Log book. Danger & Caution notices. Safety Posters. Network outlet. Insulating Gloves Rubber matting shall be provided and conform to BS 921. These shall be adequately sized and located to provide authorised personnel from making contact with a noninsulating floor with either or both feet. Transformers Transformers shall generally be floor mounted and be naturally ventilated within the enclosure built. Transformers shall meet the requirements set out in the Table 1 below: Table 1 Type Primary Voltage (No Load) Secondary Voltage (No Load) Amorphous core 11000 Volts 415 Volts Vector Group Dyn11 Tapping Range/Steps on HV winding +5, +2.5, 0, -2.5, -5 (%) Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 12 of 47

Tapping Switch Cooling Tank Off Circuit ONAN Breathing Reference Temperature 75 C Temperature Rise Oil/Winding 60/65 C IEC 60076 Standards EN ATS 35-1 8 Transformers shall be sized for maximum efficiency and only oversized if the additional load is known to be required within 3 years of installation. Cable Type; all HV cabling shall have a red outer sheath. The existing network is a mixture of 95 mm² 3 core copper SWA 9 and 185 mm² 3 core aluminium SWA cable. All new installations shall be in copper with cores identified by colour or number insulated in XLPE 10. Only cables complying with BS 7835 11 (3 core with low smoke zero halogen insulation) shall be used. Underground cables; if located under a footway or verge the depth shall be 450 1200mm, if under a road way the depth shall be 750 1200mm. Exact depth shall depend on adjacent services and structures and the final decision shall be made by the Head of Engineering and Infrastructure or the UEA Electrical Engineer following reference to campus utility drawings. Red tiles shall be placed over cables and a warning tape placed 150-200mm above the tiles along its entire length 12. Marker systems shall be yellow with black and red legend or concrete tiles. Support; HV cabling shall be adequately supported throughout its length where routed within buildings supplying ring main units and transformer supplies. Methods of support proposed shall be discussed prior to installation with the UEA s Electrical Design Engineer for approval. Jointing; T jointing is not permitted on any part of the HV network. Where joints are necessary these shall be of the in line type and be resin filled and their position plotted on the UEA s CAD system. Ring main units Type; Manufactured by Schneider, type RE2C. Any new installation shall be pre-wired with the facility to integrate with the UEA s HV monitoring Building Management System (BMS). 8 Electrical Networks Association Technical Specification 35-1 9 Steel wire armoured 10 Cross Linked Polyethylene 11 BS 7835:2007 Electric cables. Armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 kv to 19/33 kv having low emission of smoke and corrosive gases when affected by fire. Requirements and test methods 12 As required by the National Joint Utilities Group Guidelines on the positioning and colour coding of underground utilities apparatus Volume 1 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 13 of 47

Ring Switch; 630 A fault make/load break, spring assisted switches comprising 3 position units offering a main on/off/earth on function. The switch is inherently interlocked to prevent the unit from being switched from the main on to earth on position without first being in the off position. Selection of the main and earth position shall be made through a lever on the facia, which is only allowed to move if the switch is in the off position. Both ring switches shall be equipped with provisional wiring for automatic motor driven automation. Switch boxes with vacuum type ark suppression are preferred. Switch function; The 200 A spring assisted circuit breaker comprises a 3 position unit offering a main on/off/earth on function. The circuit breaker is naturally interlocked to prevent the unit from being switched from the main on to the earth on position without having first being in the off position. The selection of the main and earth positions are made through a lever on the facia, which is only allowed to move is the switch is in the off position: Aux contacts 1NO + 1NC. Earth position selected 1NO. Earth ON 1NO. Protective devices; Self powered IDMT 13 overcurrent and earth fault relay, VIP 300. In accordance with IEC 60255 and BS142 Protection CT s - 200/1A class X. Setting range: Overcurrent: 20-200A. Earth fault: 2-160A. Connection to BMS It is proposed that following the upgrade of the last three remaining oil filled ring main units the HV network will be connected and controlled via a BMS. This may form part of the existing TREND system or could possibly be a stand-alone network. Proposals for new substations must cater for this in their design and in providing all necessary infrastructure required to integrate into the UEA s system. Earthing arrangements The earthing system provided at any sub-station shall comprise two separate circuits each attaining an ohmic reading of less than 1Ω when isolated from the main network. How this is achieved is subject to discussions with the UEA Electrical Engineer. Following approval, a connection shall then be made to the first earth circuit to the star point of the supply transformer providing a system neutral earth. The second circuit shall be connected to the earthing mat/stake system to facilitate routine testing/adjustments on a live network without the need for isolating the sub-station. Sub-station earthing must comply with BS 7430. 13 Inverse Definite Minimum Time Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 14 of 47

Within each sub-station an earth bar shall be installed 450mm above finished floor level and supported off the wall by isolators. The earth bar shall be a hard drawn copper bar and of sufficient size to accommodate: HV switch frame. LV switch frame. Transformer frame earth. LV Generator frame earth. Transformer neutral earth. LV Generator neutral earth. Testing & commissioning A full visual inspection of plant installed shall be carried out by the contractor prior to any testing in order to make sure equipment is in a serviceable condition. For new installations each circuit shall be tested for resistance and the test results presented to the UEA Electrical Engineer for approval. Existing HV cables, switches and transformers shall be tested with a voltage no greater than 5 kv with prior written permission of the UEA Electrical Engineer. A sanction to test shall be obtained from the UEA Electrical Engineer. Handover Prior to handover, all test documentation shall be presented to the UEA s Electrical Engineer for comments and approval. Following approval, all drawings, plans and BIM files shall be completed and presented as stated in the contract documentation within 2 months of the commissioning date. BIM Level 2, 6D shall be protocol applied and achieved. Retentions will not be released until all contractual obligations have been met and in some cases a damages claim may be the result of late submission. Record drawings shall meet the UEA s CAD specifications as set out in Part 15 of the Design Guide. All significant assets (as defined by the Head of Engineering and Infrastructure) shall be recorded by the contractor using the UEA s standard asset capture template. Warranty All parts and workmanship shall be guaranteed for a period not less than 60 months from the date of commissioning. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 15 of 47

Operational procedures The UEA employs highly developed operational procedures to ensure safety, reliability and business continuity. Any contractor planning to survey, test, isolate, modify or connect to any part of the UEA HV network shall contact the UEA Electrical Engineer at least 2 weeks in advance of the activity to discuss and agree a schedule of works. Contractors/consultants should note that the isolation of a sub-station has a considerable effect on the buildings supported and so isolations shall be scheduled during holiday periods whenever possible. Minor alterations not requiring transformers isolation are less disruptive and require a minimum of two weeks notice. Isolations will be carried out by UEA Authorised Personnel only. Following isolation and earthing the cable being worked on, contractor shall take control of only that part of the HV network according to the UEA s HV procedures which include a permit to work. If a contractor wishes to use their own safety documentation then this will be in addition to the UEA Permit and not a replacement of. Test certificates shall be provided within 4 weeks of the test procedure which lists the recorded tests, readings and the duration. Faults requiring immediate notification shall be reported within the same 24 hour period as the date of the test. Contractors arriving at the campus shall undergo a site induction programme which shall include proof of competence, equipment calibration, insurance cover the issuing of permits. This process may take up to 1 hour. Suggested Schematics for HV systems See suggested schematic DG 6.1a A schematic of the current HV system is available on request. A campus plan showing HV compound and cable locations is available on request. Applicable Standards and Best Practice Guides for HV Systems The materials, components and completed installations shall conform as applicable with the following Standards, including all amendments, current at the time of tendering. Construction products should comply with European Standards and Technical Specifications (ESTS), generally ISO series, shall be equally acceptable. Health and Safety at Work Act 1974 Electricity Supply Regulations 1988 (as amended 1992 and 1994) Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 16 of 47

Electricity at Work Regulations 1989 CIBSE Guide K Electricity in buildings BS EN 50187: Gas-filled compartment for AC switchgear and control gear BS EN 60129: Specification for alternating current disconnectors and earthing switches BS EN 60255: Electrical relays BS EN 60265: Specification for HV switches BS EN 60282: HV fuses. Current limiting fuses BS EN 60298: AC metal-enclosed switchgear and control gear BS EN 60420: Specification for HV AC switch-fuse combinations BS EN 60470: HV alternating current contactors and contactor-based motor starters BS EN 60644: Specification for HV fuse-links for motor control applications BS EN 60694: Common specifications for HV switchgear and control gear standards BS EN 61330: HV/LV prefabricated sub-stations BS EN 62271: HV switchgear and control gear BS 159: Busbars and busbar connectors BS 923: Guide on HV testing techniques BS EN 60044-1: Instrument transformers. Current transformers BS EN 50464-2-3:2007. Three-phase oil-immersed distribution transformers 50 Hz, from 50 kva to 2500 kva with highest voltage for equipment not exceeding 36 kv. Distribution transformers with cable boxes on the high-voltage and/or low-voltage side. Cable boxes type 2 for use on distribution transformers meeting the requirements of EN 50464-2-1 BS 5207: Specification for sulphur hexafluoride for electrical equipment BS 5311: HV alternating current circuit breakers BS 5992 (IEC 60255): Electrical relays BS 6480: Impregnated paper-insulated lead or lead alloy sheathed cables of rated voltages up to 33 000 V BS 6553: Guide to the selection of fuse links of HV fuses for transformer circuit applications BS 6622: Cables with extruded cross-linked polyethylene or ethylene propylene rubber insulation for rated voltages up to 19/33 kv Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 17 of 47

BS 6626: Maintenance of electrical switchgear and control gear for voltages above 650 V and up to and including 36 kv BS 6878: HV switchgear and control gear for industrial use. Cast aluminium alloy enclosures for gas-filled HV switchgear and control gear BS 7197: Performance of bonds for electric power cable terminations and joints for system voltages up to 36 kv BS 7315: Wrought aluminium and aluminium alloy enclosures for gas-filled HV switchgear and control gear BS 7835: Armoured cables with extruded cross-linked polyethylene or ethylene propylene rubber insulation for rated voltages up to 19/33 kv having low emission of smoke and corrosive gases when affected by fire Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 18 of 47

4 Low Voltage Systems Introduction The scope of this section includes low voltage power supply systems and excludes alarm and communication systems which are covered by other sections of the Design Guide. The UEA operates and maintains a privately owned high voltage (11 kv) network which supplies the main Campus with electricity via sub-stations strategically located around the site. Some buildings at the periphery of the campus are supplied more conventionally by the local Distribution Network Operator (DNO). Transformers located within substations, regardless of ownership, step down the supply voltage from 11 kv to a nominal 400 V (per phase) creating a low voltage (LV) distribution network. For most of the campus the LV distribution network is owned by the UEA. Some buildings at the periphery are supplied by the DNO s distribution network. Designers considering modifications or additions to any LV network at the UEA shall seek guidance regarding ownership of the system they propose to alter. Guidance shall be sought from either the Head of Engineering and Infrastructure or the UEA s Electrical Engineer. Types of LV system found at the UEA definitions The LV network comprises two types of installation: 1. Building LV System ; within buildings; starting at the main incoming protection and metering panel of a building and running throughout a building to loads (e.g. lighting, HVAC plant, etc). This type of LV system is referred to hereafter as a Building LV System. Designers can work on any Building LV Distribution System at the UEA. 2. Supply LV System ; supply to a building; i.e. starting at the LV distribution panel in an HV compound and extending (often underground) to the main incoming protection and metering panel of the building being supplied. This type of LV system is referred to hereafter as a Supply LV System. Designers can only work on a Supply LV Distribution System if it is owned by the UEA. Systems owned by the DNO are outside the jurisdiction of the UEA and so the DNO must be approached in the conventional way for any change being sought. The sections below describe the UEA s design requirements for these types of LV system. Safety Warning A large proportion of the UEA is served by the original main low voltage distribution panels of 1960 s design and construction. This places restrictions on capacity and load placed upon them. Some of the older panels are not provided with secondary protection and so there exists a risk contact with live parts. Caution should be exercised should it be necessary to remove any panel covers without isolating first see Section 4.2.18 below for details of the permit to work scheme in operation at the UEA. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 19 of 47

Access to low voltage switch rooms is restricted to persons deemed competent by the UEA Electrical Engineer and familiar with The Electricity at Work Regulations 1989, BS 7671 and Health and Safety at Work Act 1974. Access for the purpose of feasibility and/or load studies is by prior arrangement via The Head of Engineering and Infrastructure or the UEA Electrical Engineer. Prior notice of a visit must be given so that risk assessments, method statements and permits can be validated. Key Principles and Requirements The following principles and requirements apply to LV system design: Voltage drops for LV systems, regardless of whether they are supplied by the DNO or the UEA s network, shall be limited to 3% for lighting and 5% for other uses as described by BS 7671 (notwithstanding that high initial inrush currents may result in a greater drop), as measured from the sub-station LV distribution panel. Form 4, Type 6 distribution panels shall be used. A metering scheme shall be developed to facilitate client energy consumption billing (where required) as well as the benchmarking of energy performance as set out in CIBSE TM46 Energy benchmarks 14. Meters shall be located next to loads on distribution boards. Steel wire armouring shall not be used as a circuit protective conductor (CPC); CPC s shall be provided by a conductor included in the cable package. A centralised switching scheme shall be developed to allow groups of loads to be switched off by the Energy and Utilities Manager for strategic energy saving or load shedding. Single Phase loads shall not exceed 3 kw Redundant plant shall be removed as part of any refurbishment works. Twin and earth type cables shall not be used. Single conductors with a minimum surface area of 1.5mm² shall be used. All conductors shall be insulated with low smoke and fume insulation. T jointing is not permitted. Power factor correction (PFC) equipment shall be installed either within LV plant rooms or within HV compounds depending on the nature of the project. Voltage optimisation (VO) equipment shall be installed either within LV plant rooms or within HV compounds depending on the nature of the project. Harmonic filter equipment shall be installed either within LV plant rooms or within HV compounds depending on the nature of the project. 14 CIBSE TM46: Energy benchmarks Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 20 of 47

New and existing distribution panels shall be provided with 25% spare capacity so consideration must be given to the possibility of replacing existing distribution panels to facilitate future demands. Distribution boards that no longer comply with current legislation shall be replaced in order to provide valid certification. All new circuits shall be clearly labelled within the distribution board and cross referenced at the load end of the supply. Some buildings or circuits may require an uninterruptable power supply (UPS) in the form of generator back-up or battery powered back-up. The need for UPSs shall be determined during the design process. Consideration shall be given, when designing additions to existing circuits that they may be provided with a back-up power supply such as a generator. All parts and workmanship shall be guaranteed for a period not less than 60 months from the date of commissioning. Preferred Materials, Technology and Solutions for LV Distribution ibution Systems Calculations for Building LV Systems Submissions Load to be connected in kw Earth fault loop impedance Zs Type of cable to be used Installation reference method Table 4 A1 BS 7671 Circuit protection proposed Anticipated volt drop Size of circuit protective conductor and earthing arrangement. Calculations for Supply LV Systems Submissions for new sub-mains shall include the following as a minimum: Load to be connected in kw Earth fault loop impedance Zs Type of cable to be used Single or three phase supply Installation reference method Table 4 A1 BS 7671 Circuit protection proposed Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 21 of 47

Anticipated volt drop Size of circuit protective conductor and earthing arrangement. Following the completion of the installation this information will be checked against the original submission. LV cable, fixing and containment Internal cable type; generally power cables shall be LSF or LSHF (Low Smoke Halogen Free) and be BASEC (British Approvals Service for Cables) approved. All cables shall be delivered to site with each coil having its seal intact and bearing the name of the manufacturer, classification, size, description of cable, length and grade. For cables in conduit or trunking within buildings; minimum size of conductor shall be 1.5mm² copper, coloured throughout the whole length in accordance with the I.E.E. regulations. PVC insulation 450/750 volt rated, to BS 6004. Cables having insulation of butyl rubber to BS 6007, silicone rubber to BS 6007 and other heat resistant cabling to the appropriate BS Standard fit for purpose. Flexible cables shall not be installed with conductor size smaller than 0.75mm² and be rated at 300/500v unless specified otherwise. External cable type; for external lighting Earthing shall not be by means of steel wire armouring. A dedicated conductor shall be used as the circuit protective conductor. All cables shall be installed in accordance with the requirements of the General Specification. Armoured cables shall be terminated by means of compression glands of approved pattern, complete with heat Shrink P.V.C. sleeve. P.V.C. insulated and sheathed cables shall be neatly dressed with the minimum of sheath removed, consistent with the length of conductor required. Green / yellow P.V.C. sleeving shall be used to enclose the full length of composite circuit protective conductor. All tails shall be fitted with Heath Shrink sleeving to achieve double insulation with colour designation. Cables laid under carriageways, vehicular crossings, driveways, footpaths, etc. shall be enclosed in ORANGE P.V.C. ducts, marked electrical cables, of suitable size, all in accordance with the requirements of the General Specification; at a depth of 750mm under carriageways, 450mm elsewhere. Cables installed in solid construction (e.g. concrete, brickwork, etc,) shall be enclosed in high impact round P.V.C. conduit or P.V.C. ducting, as appropriate, to facilitate possible future rewiring. Cables shall be securely fixed (i) close to their terminations to alleviate movement causing stress on connections; (ii) along their length where surface fixed in columns, feeder pillars, cupboards, etc. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 22 of 47

Underground cabling shall be covered over its whole length by yellow P.V.C. marker tape, 150mm wide, not less than 0.1mm thick, and printed STREET LIGHTING CABLE positioned 150-200mm deep. Supports & Fixings; Where cables are not directly supported by the use of cable cleats, cable tray, a basket or ladder conforming to BS 61537 15 shall be utilised. These type of cable support system should be selected to carry the weight of the installed cables and where routed outside should have a protective cover to protect from the effects of UV from sun light. Cable support systems shall be manufactured from mild steel and be galvanised to reduce corrosion. Cables shall be securely fixed in place utilising either plastic or metal ties. Clamps may be required to prevent movement on larger cables in the event of short circuits. Cable routed in ceiling voids, risers and along corridors will need adequate support and fixing. Contractors found to be laying cables across suspended ceiling without containment or support will be made to correct the defective work and risk being removed from the approved contractors register. Cables supporting life protection systems such as fire alarms, disabled refuge systems and intercom systems will need to conform to enhanced fixing requirements. Jointing; Jointing of cables shall only be permitted when there is no other economic option and will not be tolerated on new installations. T joints shall not be used. On small duty (< 3 kw) cabling jointing shall use the following methods: Crimped compression joints utilising insulated lugs covered with heat shrink to prevent contact with live conductors or alternatively Suitably sized terminal box incorporating din rail mounted insulated through joints. The terminals and cable shall be numbered should disconnection be required in the future for testing purposes. On larger duty (> 3 kw) cabling jointing shall use the following methods: Purpose made through jointing systems, suitable for underground, filled with cold pouring resin compounds shall be used. These joints shall be made following the manufacturer s recommendations and comply with the appropriate BS Standard. Suitably sized and adequately fixed metal enclosure provided with din rail mounted and insulated terminals. Alternatively the connection can be via crimped and shrouded jointing. Protection devices for Supply LV System Sub-station panels shall be provided with over current and earth fault protection using protection devices with configurable settings. 15 BS EN 61537:2007. Cable management. Cable tray systems and cable ladder systems Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 23 of 47

Protection devices for Building LV System The design of any new service or circuit shall allow for discrimination with other devices connected either upstream or downstream of the new load/circuit. Whole installation protection; the building LV system shall be protected at the supply intake point by an MCCB 16 with variable settings as follows: Over load protection threshold (Ir) Short circuit protection pick up (Im) Earth fault protection The setting information shall be labelled on the outside of the cubicle door to enable the information to be read without isolating the panel or circuit when required. This information should also be documented in the O&M manual and any circuit charts provided. Sub-circuit protection; each sub distribution board shall be protected with a manual main switch with individual circuits protected by RCBOs 17. An example of a protection device meeting this specification is Schneider s NS 100. Labelling Labels shall be provided on all items of equipment (light switches, sockets and all other electrical assets) with a reference indicating the distribution board and way servicing the equipment. Labels shall be mounted on fixed portions of equipment and not on a withdrawable or interchangeable section. White Traffolyte material shall be used for labels, suitably sized with black lettering for general information and red lettering for warning labels. Labels shall be fixed to equipment using brass nuts and bolts securely fastened and clearly visible when facing apparatus. Bonding conductors shall be labelled at the main earth terminal bar and labelled SAFETY ELECTRICAL CONNECTION DO NOT REMOVE. Luminaire switches and socket outlets shall be labelled indicating the distribution board and way serviced by. This applies to all switches and all socket outlets installed. Dyno tape labelling shall be used for labelling accessories using black lettering on a clear backing. A common sense approach should be taken when positioning the label on to the switch or socket outlet. Radial circuits and sub-mains cabling shall have both ends of the cable run clearly identified by the use of cable identification tags securely strapped utilising nylon cable tie or equivalent. Identification tags shall be installed in a clearly visible location at each end of the supply cable. 16 Moulded case circuit breaker 17 Residual circuit breaker with overload Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 24 of 47

Hand written information is not acceptable and contractors should refrain from this practice. Earthing General earthing arrangements; the earthing system of an installation shall comprise a separate neutral and protective conductor throughout. The main equipotential bonding conductor shall connect all incoming main metallic piped services and lightning protection systems to the main earthing terminal. The metallic sheath of telecommunication systems is to be similarly bonded but only with the permission of the operator. Extraneous conductive parts of all other separate services particular to the building shall also to be connected to the main earthing terminal: including heating pipes, air conditioning plant, medical gas apparatus, compressed air and vacuum systems and exposed metallic parts of the building fabric including metallic ceiling grids. Where necessary extraneous conductive parts of exposed metalwork shall be connected to circuit protective earth conductors by local supplementary bonding to maintain an equipotential zone. Earthing for data and telecoms; earthing of data and telecommunications can give rise to higher than normal currents within the protective conductor and these specialist areas are covered in more depth in section 607 of IEE wiring regulations. Contractors should be aware of these areas when installing services to IT areas and satisfy the requirements of the regulations in full. Earthing in centralised IT areas; the UEA has two central IT areas where a concentration of equipment reclassifies these areas as special locations requiring earthing techniques in addition to those described above. Working within these areas requires additional measures that shall be discussed with the Head of Engineering and Infrastructure or the UEA Electrical Engineer during the design process. Metering Requirements for metering; requirements for metering may include any or all of the following: Energy billing purposes for whole buildings, smaller areas within buildings (such as cafes) or individual items of plant Statutory and in-house monitoring and targeting compliance with regards AD Part L In house monitoring and targeting exercises Demonstrating compliance with government incentive schemes such as the Feed in Tariff scheme for low carbon generation or the Combined Heat and Power Quality Assurance Scheme (CHPQA) for example Demonstrating compliance with environmental standards such as Passivhaus or BREEAM Designers shall seek advice from the Head of Engineering and Infrastructure or the UEA Electrical Engineer regarding the exact nature of the metering requirements for any scheme being developed. An outline of the requirements for each type of meter are discussed below. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 25 of 47

Energy billing and whole building metering; the UEA currently doesn t internally recharge its own operations for energy but it does charge external operators such as catering operations and third party owners of buildings located within the campus. Even where a building is owned and operated by the UEA, a measurement of whole building consumption is required for internal analysis. Requirements for whole building and/or energy billing meters are given in Table 2 below: Table 2 3 wire for inherently balance loads 4 wire for other loads Able to measure Voltage. Accuracy kwh Accuracy Wh Accuracy kvarh Rates External communication Connection mode Battery Support Modes Data storage Data granularity Current. Frequency. Active, reactive & apparent power. Power factor. Power quality measurements. Class 1 or 2 (EN 62053-21) depending on application Class A or B (EC Directive 2004/22/EC [MID]) depending on application Class 2 or 3 depending on application Comprehensive tariff structure RS 232 serial communications and Mod- Bus CT or direct connected with protected voltage tappings Load profiling Read without power option Import and export capability Up to 90 days of profile data Exporting data evert 15 minutes to the UEA s Trend Database Statutory and in-house monitoring and targeting compliance with regards AD Part L; the designer shall prepare a proposal for monitoring consumption on a circuit by circuit basis that shall be discussed with the Head of Engineering and Infrastructure or the UEA Electrical Engineer. The proposal shall be comprehensive and developed in accordance with best practice for benchmarking of energy performance such as the approaches set out in CIBSE TM46 Energy benchmarks. The UEA expects to receive a design that allows the following loads to be monitored effectively: Lighting Small power Ventilation Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 26 of 47

Heating plant Cooling plant Centralised IT Significant items of plant Services external to the building such as car park lighting and electric vehicle charging points Demonstrating compliance with government incentive schemes; schemes such as the Feed it Tariff (FIT) and Combined Heat and Power Quality Assurance (CHPQA) scheme have specific metering requirements. Designers shall ensure metering schemes are compliant with any renewable or low carbon generation systems installed. Demonstrating compliance with environmental standards such as Passivhaus or BREEAM; such schemes often have specific requirements for determining energy consumption. For example, it may be necessary to discount electrical used externally to a building (e.g. for car park lighting) and so the metering scheme must allow this. Generator Connection Points In all new installations the main switch panel is to have a generator connection point incorporated. The connection point is to be rated for the design load of the switch panel plus any spare capacity. A trapped key interlock i.e. Castell key, shall be used for the changeover device. The location of the external connection point has to be coordinated with the external landscaping of the building, as to allow for external generators to be able to be moved close enough to allow easy connection, as well as operate in that location for long periods of time. Air quality issues caused by a generators exhaust and noise issues should be considered when locating the connection point. Generator connections shall allow for parallel mode operation so that generator testing can be undertaken without having to isolate an installation. Designers shall propose where the earth/neutral link is made and how the link is managed when running in parallel mode. Obtaining permission to connect the generator in accordance with G59 18 and successful witness testing shall remain with the designer or contractor. The current policy is to located G59 relays at each generator connection point in the same way as a DNO s HV network is protected. Generators Buildings, depending on their required level of resilience, may require: No generator back-up Essential services generator back-up (with the distribution system designed accordingly) with automatic mains failure starting 18 Energy Networks Association Engineering Recommendation G59 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 27 of 47

Full generator back-up i.e. load x 1 with automatic mains failure startting Generator back-up for load x 2 i.e. generator back-up with generator back-up, with automatic mains failure starting Recommendations shall be made to the Head of Engineering and Infrastructure for his of her final decision. Voltage optimisation Voltage optimisation apparatus shall be applied to all new installations. The designer shall discuss the optimum location with the Head of Engineering and Infrastructure or the UEA Electrical Engineer and this may be within the building s LV plant room or the LV distribution panel in the HV compound. For existing systems and when LV cubicle panels are being replaced, power factor correction capacitor shall be combined as part of the new panel. Generally capacitor banks shall incorporate harmonic blocking and be multi-staged with on/off/auto facility available and shall be integrated with the BMS. Power factor correction Power factor correction apparatus shall be applied to all new installations. The designer shall discuss the optimum location with the Head of Engineering and Infrastructure or the UEA Electrical Engineer and this may be within the building s LV plant room or the LV distribution panel in the HV compound. For existing systems and when LV cubicle panels are being replaced, power factor correction capacitor shall be combined as part of the new panel. Generally capacitor banks shall incorporate harmonic blocking and be multi-staged with on/off/auto facility available and shall be integrated with the BMS. Harmonic filtering The designer shall discuss the need for harmonic control and/or filtering according to the types of loads being supplied. As a minimum, loads that give rise to harmonic distortion may be provided with double-size neutral wires or separate neutrals for each phase and may be provided with a separate fullsize insulated earth conductor rather than relying on the conduit alone as a return ground path. For greater levels of control, harmonic filtering apparatus may be installed for individual circuits, groups of circuits or whole buildings/installations according to the nature of loads and their harmonic generating characteristics. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 28 of 47

Connections to BMS Section 5 of the Design Guide offers guidance for designers regarding BMS integration. In summary though and with regards distribution systems, only energy meters shall be connected to the BMS. All significant loads (e.g. chillers, AHUs, etc) shall be connected to the BMS. Redundant Materials Redundant materials shall be removed from site upon completion including: Electrical apparatus rendered redundant as a result of the new installation Packaging and all waste resulting from a new installation Inspection & Testing New installations; on completion of works the contractor shall submit a certificate complying with the requirements of the current edition of the Requirements for Electrical Installations BS 7671 within 4 weeks of the test date. The format of the certification shall be either NICEIC or ECA. Certification is to be submitted to the UEA s Electrical Design Engineer for approval. The contractor shall notify the Head of Engineering and Infrastructure or the UEA Electrical Engineer of the test date giving two clear working days to allow the test to be witnessed. Should any part of the installation fail, a re-test of the entire installation shall be carried out following corrective action. Test instruments shall be calibrated and all test leads shall be fused and fit for purpose. Periodic inspection & testing; following a periodic inspection, a periodic inspection report must be issued within 1 week of the test date and should include the following: The extent of the installation covered by the report. Agreed limitations of the inspection. The purpose for which the report has been requested (following fire or flood, licensing application or at the end of a recommended period). Observations and recommendations should be categorised using the code numbering system : Requires urgent attention. Requires improvement. Requires further investigation. Does not comply with BS 7671. A summary of the inspection detailing the condition of the installation with regard to safety. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 29 of 47

A schedule of inspection and test results. The format of certification shall be either be issued by National Inspection Council for Electrical Installing Contractors or the Electrical Contractors Association. Handover requirements Prior to handover, all test documentation shall be presented to the UEA s Electrical Engineer for comments and approval. Following approval, all drawings, plans and BIM files shall be completed and presented as stated in the contract documentation within 2 months of the commissioning date. BIM Level 2, 6D shall be protocol applied and achieved. Retentions will not be released until all contractual obligations have been met and in some cases a damages claim may be the result of late submission. Record drawings shall meet the UEA s CAD specifications as set out in Part 15 of the Design Guide. All significant assets (as defined by the Head of Engineering and Infrastructure) shall be recorded by the contractor using the UEA s standard asset capture template. Warranty All parts and workmanship shall be guaranteed for a period not less than 60 months from the date of commissioning. LV system operational procedures General; the UEA employs highly developed operational procedures to ensure safety, reliability and business continuity. Any contractor planning to survey, test, isolate, modify or connect to any part of the UEA LV network shall contact the UEA Electrical Engineer at least 2 weeks in advance of the activity to discuss and agree a schedule of works. Contractors/consultants should note that the isolation may interrupt the operation of buildings or particular spaces and so isolations shall be scheduled accordingly and may involve night or holiday time working. Permits to work; all work at the UEA requires the issuing of a permit to work. If a contractor wishes to use their own safety documentation then this will be in addition to the UEA Permit and not a replacement of. Test certificates shall be provided within 4 weeks of the test procedure which lists the recorded tests, readings and the duration. Faults requiring immediate notification shall be reported within the same 24 hour period as the date of the test. Induction; Contractors arriving at the campus shall undergo a site induction programme which shall include proof of competence, equipment calibration, insurance cover the issuing of permits. This process may take up to 1 hour. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 30 of 47

Connection & isolation arrangements for single phase loads not exceeding 3 kw; for single loads not exceeding 3 kw and being supplied from an existing circuit or dedicated radial circuit, an electrical isolation Permit will not be required. This is providing the new load is being connected via an existing fused connection unit or other double pole isolation device. For all other connections an electrical isolation Permit must be obtained prior to any works within a distribution board/panel taking place. Existing distribution shall be left with spare capacity so consideration must be given to the possibility of replacing a distribution board to facilitate future demands. Distribution boards no longer complying with current legislation will also require replacement in order to provide valid certification. The new circuit shall be clearly labelled within the distribution board and cross referenced at the load end of the supply. Connection & isolation arrangements for single phase loads exceeding 3 kw; at least 4 weeks prior to any connection/isolation the following information shall be submitted: Accurate evaluation of anticipated load. The date when connection is required. Single or three phase load. Type of load to be connected. The location of the new load. Origin of service distribution board load to be taken from. This information shall be presented to the UEA Electrical Engineer for evaluation and discussion so that a schedule of works can be agreed. Suggested Schematics for LV Distribution Systems See suggested schematic DG 6.1a Applicable Standards and Best Practice Guides for LV Distribution Systems BS 7671: Requirements for Electrical Installations IEE Wiring Regulations Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 31 of 47

Preferred Materials, Technology and Solutions for Single Phase Power Distribution General Single Phase loads shall not to exceed 3 kw Small power and light switches should be MK fittings with contrasting colours as required by AD Part M 19. Floor boxes Floor boxes should be of the highest durability ideally stainless steel construction. Any connection boxes located in raised access floors should be clearly marked on the top of the raised floor panel before the carpet tiles are fitted and marked on the as built plans. Care should be taken that floor boxes are used of sufficient depth that allow lids to be closed with services attached e.g. ICT / AV equipment. NOTE: some AV connection plugs may be large. Floor boxes with dado trunking or fully raised floors - reviewed for each room. Dado trunking to the teaching wall even with the raised floor. Floor box design should be cognisant of the services to be connected such that lids can be closed whilst services are connected and trip hazards are avoided. Floor grommets may be a viable and acceptable alternative especially where Teaching Lecterns interface to data and audio visual systems. All floor boxes are to be coordinated to the furniture layouts allowing their positions to reflect that of the points they are to serve. Dado trunking Dado trunking is the preferred solution for teaching spaces. In other spaces dado or skirting height trunking may be use depending on the application. Designers shall approach the Head of Engineering and Infrastructure or the UEA Electrical Engineer for advice. Hand driers High air velocity, low noise energy efficient hand dryers shall be used 19 AD Part M: Access to and use of buildings Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 32 of 47

Motor Control Centres General description Motor control centres shall be utilised for the control, switching and selection of mechanical plant. These may be located adjacent to the plant within the plant room or alternatively within adjacent risers. Motor control centres shall provide clear indication of the operation of the plant and its current status. Panel construction Motor control centres shall be constructed from a pressed steel construction with a powder coated paint finish. Paint colours to match existing and agreed with the UEA Electrical Engineer. Cabling Cables within motor control centres shall be copper Standard PVC sheathed singles, neatly dressed and secured to the panel using purpose made box section PVC containment trunking. Connection to terminals shall be made using shrouded spade connections where appropriate. Containment Outside of the control panel containment should be either high impact PVC conduit and trunking or steel conduit and trunking where there is a possibility of mechanical damage. Earthing Earthing of the whole control system should follow the guide lines as detailed within the IEE Electrical Installation regulations. BMS Integration Motor Control Centres shall be integrated with the BMS. Designers shall approach the Head of Engineering and Infrastructure or the UEA Electrical Engineer for advice. Lamps and indicators Lamps should be used to indicate the following conditions: Panel Line - Red Run - Green Trip - White Lamp test facility must be provided. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 33 of 47

Door safety interlocks All motor control centres must be fitted with a quarter turn door interlock isolator, colour coded (red - live; green - isolated), beneath turning handle vision panel. Motor control centres containing building management controls shall be fitted with defeatable isolator interlocks, to facilitate fault finding. This should include inverter sections of machinery control panels, unless inverter display is mounted on the door. Labelling Panels and switches must be labelled using traffonyte labels fixed to the panel using a mechanical fixing, adhesive is not acceptable. Testing & commissioning Motor control panels shall be factory tested prior to being delivered to site. This testing should follow the guidelines laid down in the IEE regulations and should also include the functionality of all control equipment in order to reduce the number of teething problems when site commissioning commences. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 34 of 47

Preferred Materials, Technology and Solutions for Lamps and Luminaires Lighting criteria (W/m²) for different space types (residential, teaching, etc) can be found in Part 3: Design philosophies and criteria for heating, cooling, ventilation and light in Buildings. This document provides guidance that focuses on delivering lighting schemes to meet the criteria set out in Part 3. Attention is also drawn to section 4.2.2. of Part 9 of the Design Guide: Universal design and access to all. This section sets out requirements that ensure lighting schemes that are usable by people of all abilities. Preferred lighting technologies All applications shall be lit with either LED or T5 fluorescent systems. Any proposal to utilise alternative technologies shall be submitted to the Head of Engineering and Infrastructure or the UEA Electrical Engineer for evaluation. Alternative design solutions shall only be developed with the written consent of this authority. All lighting at high level or requiring complicated access arrangements to maintain shall use LED s. Luminaires Key luminaire criteria are: Light Output Ratio (LOR) shall be greater than 80 /0. Control gear shall be class A1 or A2 as defined by CELMA. Class Band C shall not be used Control gear parasitic (stand by) power shall be < 0.5 W. Luminaires shall be supplied with a statement of recyclability Luminaires shall be supplied with a light output test certificate that has been verified as authentic A sample of any luminaire being considered for use shall be delivered to the UEA Electrical Engineer for evaluation prior to installation Lighting control principles For new installations and for modifications to existing lighting installations a control system based on the Digital Addressable Lighting Interface 20 (DALI) shall be utilised. A control strategy, developed for each lighting zone, shall be discussed and agreed with the Head of Engineering and Infrastructure or the UEA Electrical Engineer. Emergency lighting requirements shall always take primacy where conflicts between systems occur. 20 IEC 60929 and IEC 62386 Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 35 of 47

Table 3 summarises the control strategies that designers shall base their initial designs upon. Table 3 Offices Ref: CIBSE LG7 Lighting for Offices Presence detection: No Manual switch: Yes on/off adjacent to doors (manual switch activates absence detection) Dimming: Yes - to the level of daylight available in the room whilst maintaining a high level of uniformity across the whole space. Absence detection: Yes using microwave sensors with an absence delay of 15 minutes. Emergency lighting: Non-maintained Teaching spaces Ref: LG5 Lighting for Education Presence detection: No Manual switch: Yes on/off adjacent to doors (manual switch activates absence detection) Dimming: Yes - to the level of daylight available in the room whilst maintaining a high level of uniformity across the whole space. Absence detection: Yes using microwave sensors with an absence delay of 15 minutes. For lamps adjacent to screens and white boards Fittings closest to the screens and white boards can be turned off to improve visibility. In general the ambient light level measured at the screen should be no more than 250 lux. It may be necessary to install window blinds to achieve the lux levels required. A spot light shall be provided to aid lip reading of teachers and lecturers. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 36 of 47

Scene setting: Yes - to give 75%, 50%, 25% and all off. Instructions affixed adjacent to control panel. Emergency lighting Non-maintained Workshops and kitchens Ref: BS EN 12464-1 Indoor Workplace Lighting BS EN 12464-2 External Workplace Lighting Presence detection: No Manual switch: Yes on/off adjacent to doors Dimming: No Absence detection: No Emergency lighting: Non-maintained Corridors including emergency exit routes LED Presence detection: Yes using microwave sensors Manual switch: No Dimming: Yes - to the level of daylight available in the room Absence detection: Yes using microwave sensors with an absence delay of 15 minutes. Emergency lighting: Maintained at all times at 3 lux and daylight sensing WCs and storerooms LED Presence detection: Yes using microwave sensors Each disabled WC shall be provided with a dedicated sensor. Manual switch: No Dimming: Yes - to the level of daylight available in the room Absence detection: Yes using microwave sensors with an absence delay of 20 minutes. Each disabled WC shall be provided with a dedicated sensor. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 37 of 47

Emergency lighting: Non-maintained Bedrooms Ref: CIBSE LG9: Lighting for communal residential buildings Presence detection: No Manual switch: Yes on/off (manual switch activates absence detection) Dimming: No Absence detection: Yes using microwave sensors with an absence delay of 20 minutes. Emergency lighting: Non maintained Common and breakout rooms Ref: CIBSE LG9: Lighting for communal residential buildings Presence detection: No Manual switch: Yes Dimming: Yes - to the level of daylight available in the room Absence detection: Yes using microwave sensors with an absence delay of 15 minutes. Emergency lighting: Non-maintained External lighting (excluding security lighting and car parks) LED Presence detection: No Manual switch: No Dimming: Yes inverse to the level of daylight available Absence detection: No. Emergency lighting: No External lighting for car parks LED Presence detection: No Manual switch: No Dimming: Yes inverse to the level of daylight available Absence detection: No. Emergency lighting: No Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 38 of 47

Requirements for fluorescent lighting Designs for lighting systems that include T5 fluorescent lights shall be approved, along with the products proposed, by the Head of Engineer and Infrastructure or the UEA Electrical Engineer, prior to installation. T5 lamps shall meet, as a minimum, the requirements set out in Table 4 below: Table 4 Parameter Rated Efficacy Energy efficiency class Mercury content Requirement > 95 lumens/watt A+ < 3 mg per tube Colour temperature Most spaces shall be 4000 K. For reprographic operations the lamps shall be 6500K, Ra > 92. Life 90% surviving 20,000 hours Lumen depreciation Light output > 85% of initial after 20,000 hours Colour rendering index CRI > 80 Ambient temperature the luminaire performance based on. 35 C Power Factor Housing Warranty Approvals > 0.85 for whole circuits Suitable colour and material for the application Replacement parts no less than 24 months CE marked. Test results shall be independently verified Designers shall collect and present for approval the information set out in Table 5, to the Head of Engineering and Infrastructure, when proposing T5 lighting schemes. Table 5 Parameter Requirement Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 39 of 47

Rated Efficacy Energy efficiency class Mercury content Colour temperature Lumen depreciation Colour rendering index Ambient temperature the luminaire performance based on Total power consumed per unit Initial power factor Power Factor @ at initial and 25% of rated life Standards that the product has been independently tested to and found to comply with Warranty information. Cost per unit Requirements for LED lighting Designs for lighting systems that include LED lights shall be approved, along with the LED products proposed, by the Head of Engineer and Infrastructure or the UEA Electrical Engineer, prior to installation. LED s shall meet, as a minimum the requirements set out in Table 6 below: Table 6 Parameter Efficacy Requirement > 70 lumens/watt Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 40 of 47

Colour temperature Most spaces shall be 4000 K. For reprographic operations the lamps shall be 6500K, Ra > 92. Life Light Loss - L70 = 50,000 hours Physical Failures - LED Life B10 = 50,000 hours hours Lumen depreciation Light output > 70% of initial Colour rendering index Most spaces CRI > 80 Colour temperature stability For the reprographic operations Ra > 92. Within a 3-step ellipse Ambient temperature the luminaire performance based on. Photometric distribution This information must be supplied. E.g. For indoor 25 0 C for outdoor 15 0 C Candelas (cd) and degrees Driver current Measured in ma Power Factor > 0.85 for whole circuits Housing Suitable colour and material for the application Warranty Approvals Replacement labour no less than 24 months and replacement parts no less than 60 months. CE marked, any others Designers shall collect and present for approval the information set out in Table 7, to the Head of Engineering and Infrastructure, when proposing LED lighting schemes. Table 7 Parameter Efficacy Requirement Initial Luminaire Lumen Output L100 Light Output Depreciation Category (1, 2 or 3) Luminaire life L(x) (where x is the percentage of L100 at the declared life) Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 41 of 47

Failure Fraction F(x) (where x is the percentage of failures at L(x) ) Colour Temperature Category (A, B, C or D) at initial and 25% of rated life (with a maximum duration of 6000 h) Colour Rendering Index Value Colour Rendering Index Value Shift Luminaire Electrical Characteristics Total power consumed Initial power factor Power Factor @ at initial and 25% of rated life (with a maximum duration of 6000 h) Standards that the product has been independently tested to and found to comply with Warranty information. Cost per unit To aid the designer, LED products may comply with the standards set out in Table 8. Table 8 Product type Self-ballasted LED-lamps for general lighting services >50V - Safety specifications Safety Standard Performance Standard IEC 62560 IEC 62612/PAS Publicly Edition 1 Available Specification Publication expected 2010 Control gear for LED modules LED Modules for general lighting - Safety specifications LED Luminaires IEC 61347-2-13 Published 2006 IEC 62031 Edition 1 Publication 2008 IEC 60598-1 IEC 62384 Published 2006 Draft under preparation No standard Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 42 of 47

LED s and LED modules CIE Technical Committees IEC TS 62504 Terms and Definitions for LED s and LED modules in general lighting TC2-46 CIE/ISO standards on LED intensity measurements TC2-50 Measurement of the optical properties of LED clusters and arrays TC2-58 Measurement of LED radi- ance and luminance TC2-63 Optical measurement of High-Power LEDs TC2-64 High speed testing methods for LEDs External lighting Control; the external lights shall be energised via time clocks and photocells mounted locally to the area being lit. The lights shall be operated to be set to de-energise the lighting in line with the agreed routes and paths through the campus. Lamps must be the most energy efficient available and be controlled through timers and light sensors to account for daylight. Lighting design must comply with the ILE Guidance notes for the reduction of obtrusive lighting. Provide over-ride switches to allow manual control. The campuses existing type of external luminaries should be used unless expressly authorised by the Assistant Director (Building Services) Estates & Facilities. Earthing and bonding; exposed and extraneous metalwork of each installation shall be interconnected and bonded to earth by means of suitably-sized circuit protective conductor(s). The armouring of cable refs 6941/2/3/4/7X shall not be used as the sole protective conductor but approved measures must be taken to bond to earth such armouring. A four way brass earthing terminal (with each way being capable of accepting a 10mm 2 conductor) shall be securely fixed with suitable brass screws adjacent to each supply cable cut-out. The protective conductor(s) of the supply cable and all outgoing cables shall be terminated into this connector block. A separate 10mm² able ref 649X (coloured green / yellow) shall interconnect this connector block and the main earthing stud of the pillar, column, or other enclosure, switchgear, etc. A continuous 2.5mm 2 cable ref 649X (coloured green / yellow) shall interconnect this connector block and the earthing terminals of all control gear components, time switch / photo electric controller, etc. The circuit protective conductor of the cable feeding the lamp / lantern shall be terminated into this connector block. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 43 of 47

Bonding connections shall be carried out using ring type, pre-insulated, crimp connectors securely clamped under shakeproof washers and nuts. Extensible copper clad steel earth rods, driven in by way of a high strength steel driving head, coupled where necessary by means of a counter bored long length aluminium bronze coupler and enclosed in a Furse Cat. PT 205 GRP cover secured with aluminium screws, shall be installed adjacent to all feeder pillars and feeder columns. The connection at the earth electrode shall be labelled in lettering not less than 4.5mm Electrical Earth do not remove. Further earth rods shall be installed adjacent to every third column on each final circuit and at the end of each final circuit or as indicated. Lighting units; all lighting units shall be as specified but generally the equipment shall be as follows: (a) Columns and bracket arms shall comply with the relevant British Standard specification, with a minimum thickness of 0.1mm hot dip galvanised finish to B.S.S. 729. A protective coating of not less than 0.25mm thickness of approved heavy duty black bitumastic (or other similar protective material) shall be applied internally and externally, to the root of each column, extending from the butt end to a minimum of 150mm above ground level, before installation commences. The base compartment of each column shall be of sufficient size to accommodate all necessary incoming and outgoing cables, service cut-out(s), subfuse(s), lamp and switching control equipment all mounted on 15mm fire-resistant chipboard. Every column on one installation shall be fitted with the same pattern of base compartment door (flush-fitting or overlapping) fitted with a triangular-headed locking device. Each column shall be provided with a suitably sized earth bonding terminal / stud, brazed or welded to the column in a position easily accessible from the door. Each column, feed pillar, bollard etc. shall be sited to maximise access space for all maintenance and repair operations. Due consideration shall be given to all potential hazards (e.g. traffic) affecting personnel carrying out that maintenance. Each bracket arm shall be fitted with an anti-rotation device to fix the arm at 90 o intervals from the door position. (b) Bollards shall be complete with vandal-resistant lens attached to the body by means of a tamper-proof locking device and base compartment (complete with chipboard panel, control gear etc. and space for incoming and outgoing cables) with access door, vandal-resistant lock and key, earth bonding stud, etc. The root of each bollard shall be treated against corrosion, all as described for columns in (a) above. (c) Wall mounting units shall be complete with all necessary fixing arrangements, integral control gear wherever possible, and flush mounting connection box to allow concealed cabling to be brought into the unit. Where integral control gear is not available, a control box, as described in Clause 2.7 shall be fitted adjacent to the unit or at low level to contain the gear, and / or terminate underground cabling. Fixing arrangements shall take full account of the fixing surface and structure and of any exceptional bracket arms. (d) Lanterns / luminaries shall comply with the relevant British Standard and be totally enclosed, have a minimum protection category IP54, be designed for the lamp / source specified, and be fitted with a vandal-resistant bowl / diffuser / controller. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 44 of 47

Painting; all lighting units, feeder pillars, control boxes etc. shall be painted in approved colour finish on completion. As previously specified, all parts not accessible after completion shall be painted before installation commences. Galvanised equipment shall be degreased, treated with appropriate primer and two finish coats. Access doors etc. shall be removed wherever possible while painting is carried out, and not replaced until paint has dried. The approved painting treatments shall be Dacrylte Treatment A and the finish colour shall be dark green (to be agreed with Electrical Engineer). Other manufacturers, treatments and colours are not precluded but these will be the subject of particular instructions. In all cases the manufacturers instructions and any other detailed requirements shall be followed accurately to ensure that specific guarantees given with materials are implemented. Feeder pillars / control boxes; 15mm thick fire-resistant chipboard of sufficient size to cover the whole of the rear of the pillar shall be securely mounted by at least 4 no. fixings. The specified switch / fuse / control gear shall be mounted on fire and weather proofed chipboard and connected as detailed. Other layouts and connection arrangements are not precluded but these will be the subject of particular instructions. Generally, feeder pillars shall be of sheet steel construction, adequately stiffened with fixings for the chipboard, rectangular or square in plan, approximately 900mm high above ground level, and complete with sturdy door/hinges/lock/key to counter vandalism. Control boxes for flush mounting into existing brickwork etc. shall be of a similar construction except that the door / front frame shall have a bezel to cover the box / brickwork joint. Boxes shall be sized to provide adequate space for, and access to, the control gear to be enclosed. All feeder pillars and control boxes shall be guarded against corrosion before installation by an approved anti-corrosion treatment, a primer coat and two finishing coats. Particular attention shall be paid to any metal work which will not be accessible after completion. Labelling; each lighting unit shall be labelled to the requirements of the supervising engineer. Labels shall be of a minimum size consistent with clarity (using letters / numbers 20mm high) approximately 150mm long by 37mm wide. Adhesive labels will be considered. Lamp control gear; all lamp control gear shall comply with the appropriate British Standard Specification, and be suitable for operation on 230 volts 50HZ R.M.S. 500 volts 50HZ peak, with shrouded terminals for phase / neutral connections, separate earth / bonding terminal and fixing hold clips. All live terminals shall be protected by an intermediate barrier removable only by the use of a tool or key. Ballast units / chokes shall be of the electronic where possible for 200-250 volt operation. Capacitors for correction of power factor to not less than 0.85 lagging shall be totally enclosed, proofed against condensation, provided with safety leak resistance and sealed P.V.C. tails or suitably shrouded terminal block. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 45 of 47

Igniters shall be totally enclosed with permanent terminal markings, and tapped where necessary for 200-250 volt operation. All items of lamp control gear shall be compatible with each other and the lamp which they are controlling, and arranged in column / bollard / wall mounted unit enclosure in a neat and orderly manner over as small an area as is consistent with access to terminals etc. Interconnections shall be carried out between control gear components using 6181Y and / or 6242Y cables, tidily arranged as far as possible on a common route to one side of the control gear, using plastic / nylon / P.V.C. cable ties / clips. Final connection between the lamp and the control gear shall be carried out using heat resisting 3 core flexible cable, ref. 3183TQ. Minimum cable sizes shall be 1.5mm 2 up to 400-watt lamp. Cable joints, except at terminal blocks of control gear / lamp connection will not be accepted. Builders works; concrete footings and cable routes shall be in accordance with suppliers instructions. Road and Zebra Crossing Lighting: The following standards shall be complied with: BS 5489-1:2013 - Code of practice for the design of road lighting. Lighting of roads and public amenity areas. BS EN 13201-2:2015 - Road lighting. Performance requirements. ILP Technical Report 12: Lighting of Pedestrian Crossings Emergency lighting The emergency lighting levels will need to be of a far greater level than normally required by local building control in order to facilitate safe evacuation of disabled persons. In high risk buildings 15 lux may be required (e.g. workshops) In medium and low to risk buildings a minimum of 3 lux is required 3 lux is considered by the UEA to be sufficient for most applications Emergency lighting units should be positioned to cover specific areas, for example: Intersections of corridors; Each final exit door will have maintained lighting Near each staircase so that each flight of stairs receives direct maintained lighting. Close to a change in floor level; Outside each final exit; By exit and safety signs that are required elsewhere following the risk assessment. Within lift cars; Within 2m of fire-fighting equipment Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 46 of 47

Near each fire alarm call point. All staircases, final exits doors and toilet areas should be provided with maintained emergency lighting Emergency lighting shall have local battery backup. Centralised emergency lighting systems are not to be used. Lifts shall be provided with emergency lamps that can be tested by the UEA. All installations need to comply with BS5266, building control and local fire officer requirements. The required certification proving compliance must be handed to the UEA before or at project completion. Failure to do so will result in payments being withheld. NA Suggested Schematics for Lamps and Luminaires Applicable Standards and Best Practice Guides for Lamps and Luminaires A number of lighting guides exist for the type of spaces found within the UEA University Estate. These include.- CIBSE Code for Lighting The SLL Lighting Handbook LG5 Lighting for Education CIBSE LG7 Lighting for Offices BSEN 12464-1 Indoor Workplace Lighting BSEN 12464-2 External Workplace Lighting BREEAM if relevant Building Regulations BS 5489-1:2013 - Code of practice for the design of road lighting. Lighting of roads and public amenity areas. BS EN 13201-2:2015 - Road lighting. Performance requirements. ILP Technical Report 12: Lighting of Pedestrian Crossings The most appropriate guide should be used for each space that is to be lit. Where a room is unique space like a reception, gallery or unusual room shape then detailed guidance should be sought from a lighting designer. Part 6: Electrical systems UEA Design Guide 2016 V1.0 Page 47 of 47