Electrical Safety in the Workplace

Transcription

1 Electrical Safety in the Workplace NFPA 70 E Presented by Sabine Mueller

2 What Made Sabine Choose Such a DRY Topic?

3 Ulterior Motive Metso Mueller Engineering has been visiting many scrap yards two or more times per year for >30 years. We work on medium/high voltage drive motors. When we are working at your plant Metso has a legal obligation to provide a safe workplace for our technicians. As the host company YOU are also legally obligated to provide a safe workplace.

4 NFPA NEC What is NFPA 70E and what does it have to do with OSHA & the National Electric Code?

5 OSHA 1970 Congress passed the OSH Act, which created the Occupational Safety and Health Administration, OSHA is part of the Labor Department.

6 OSHA GENERAL DUTY CLAUSE

7 The mission of the international nonprofit NFPA, established in 1896, is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating consensus codes and standards, research, training and education. The NEC is developed by an NFPA committee, which is then approved by the American National Standards Institute, ANSI. The NEC s is created primarily for those who design, install and inspect electrical installations. The National Electric Codes does not necessarily apply to workplace or employee safety.

8 In 1975 NFPA recommended to OSHA that a document be prepared applicable to electrical safety. The document was created by extracting pertinent information from the NEC and other sources. The first edition of the NFPA 70 E was published in 1979

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10 NFPA 70 E WHO DOES IT APPLY TO? WHAT VOLTAGE LEVEL DOES IT APPLY TO?

11 NFPA 70 E DETAILS FOUR PROTECTIVE STRATEGIES TO REDUCE THE RISK OF INJURY WHEN WORKING ON EQUIPMENT WHICH CONTAINS ELECTRICAL ENERGY Create an Electrically safe work condition If that is not possible Train employees about the hazards Plan the work in a way that minimizes risk Protect the employee with the appropriate PPE

12 ESTABLISHING AN ELECTRICALLY SAFE CONDITION Six Steps 1) Planning, review up to date electrical diagrams and locate all sources of electrical energy to the specific equipment and their isolation means. 2) Open the disconnect for each source 3) Visually Verify that all phases are open 4) Apply lock and tag according to written policies 5) Test 6) Ground

13 ESTABLISHING AN ELECTRICALLY SAFE CONDITION In the process of creating an electrically safe work condition the worker is exposed to hazards and must be qualified, trained, wearing the appropriate PPE.

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16 There is always some risk. Minimize the risk by making sure there is NO LOAD on the switch Stand away from the door Wear the appropriate PPE (Table 130.7)

17 Verify that all Phases are Open Are You Wearing your PPE?

18 Lock Out Tag Out Written Policy Specific to your Facility and each piece of equipment.

19 Lock Out Tag Out Policies Complexity Varies with the Device and the Facility

20 MEDIUM VOLTAGE TESTING

21 LOW VOLTAGE TESTING Date Author Title INTERNAL 21

22 GROUNDING The load side of the circuit is grounded so that accidental closure will not energize the equipment we are working on.

23 INTERNAL Date Author Title IN MY 24 YEARS OF WORKING IN THE SCRAP INDUSTRY NFPA 70E HAS ONLY BECOME A PRACTICE SINCE Capital City Metals in 2003 SIMS Metal Management in

24 INTERNAL Date Author Title Subcontractors you hire to create an Electrically Safe Work Condition for Metso need to follow these Rules Right now that is happening less than 50% of the time. Six Steps 1) Planning, 2) Isolate Source 3) Visually Verify 4) LOTO 5) Test 6) Ground 24

25 When Metso Mueller Arrives to Maintain and Inspect Your Drive METSO-MUELLER - JSA WORKSHEET System We Complete Job Safety Analysis the following JSA A hazard is the potential for harm. In practical terms, a hazard often is associated with a condition or activity that, if left uncontrolled, can result in an injury or illness. Completed by: Date: You are called to site XXX to: (perform what task) In order to do this work, the following individual tasks must be performed: 1Enter the work area 2Survey work area 3LOTO Motor 4LOTO Liquid Rheostat 5LOTO Switchgear & Capacitors 6LOTO Controls # Exit the work area Taking each task listed above, think about what general hazards (listed to right) you may be exposed to while performing that task. List the hazards you may be exposed to next to the task. Possible Hazards Associated with Task a Impact with falling or flying objects b Pentration of sharp objects 1Enter the work area a,b,c,d c Slips, trips or falls 2Survey work area L d Caught in or between a stationary/moving object 3LOTO Motor j e Fall from an elevated work platform, ladder or stairs f Excessive lifting, twisting, pushing, pulling, reaching or bending 4LOTO Liquid Rheostat 5LOTO Switchgear & Capacitors j j g Exposure to vibrating tools or equipment 6LOTO Controls j h Exposure to excessive noise 7 0 i Exposure to excessive heat or cold 8 0 j Electrical hazards 9 0 k Explosion hazard # Exit the work area L other:

26 Procedures for Creating Electrically Safe Condition 1Enter the work area a,b,c,d a Ensure that a hard hat and safety glasses are worn b Ensure that steel toed boots are worn. c Do not walk on or across metal or oily areas - clean up or take alternative route. Ensure that manager has made workers in the area aware of your presence, when working d around moving equipment, maintain eye contact with operator. 2Survey work area L L Hazards unknown inspect work area 3LOTO Motor j j Bring any hazards found to the immediate attention of the site supervisor. Review Diagrams and determine if they are up to date. Locate isolation means. Have customer/electrician open the isolations means. Visually verify all phases are open. Test for voltage. Ground the load side. 4LOTO Liquid Rheostat j j Review Diagrams and locate all sources of energy, typically 480VAC for pump/servo as well as 120VAC. De-energize and test. 5LOTO Switchgear & Capacitors j j Review Diagrams. Should have been made electrically safe when motor was LOTO. Verify that all energy sources were de-energized. Outside control power sources may exist. Identify the circuits and de-energize. Test to verify. 6LOTO Controls j j Review diagrams. Locate control power sources. De-energize for maintenance. If it is necessary to energize the controls for testing, wear appropriate PPE and plan work to minimize risk Exit the work area 0

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38 INTERNAL Date Author Title DESIGNING FOR SAFETY Provide Arc Rated Switchgear and Distribution Panels Windows for Verifying switch position MCC s External programming and testing points Use 24VDC control power 38