Arc Flash University, Session 2: NFPA 70E- 2012: Key Changes and Risk Reduction Strategies. Sponsored By:

Transcription

1 Arc Flash University, Session 2: NFPA 70E- 2012: Key Changes and Risk Reduction Strategies Sponsored By:

2 About the Viewer Panel Slides: Go to the Links tab at the top and click on the link to download the PDF of the slides In the on-demand version, use the Meeting Links button on the bottom left Q&A Ask a panelist a question by entering your question in the Question & Answer box and click submit Archive: Within 7 days, the on-demand recording of the Webcast with Q&A will be posted We will send an to registered attendees with hyperlink Can also access from Technical problems? Click on the HELP tab at the top Send a question from the Question window

3 RCEP Standards Plant Engineering has met the standards and requirements of the Registered Continuing Education Program. Credit earned on completion of this program will be reported to RCEP at RCEP.net. A certificate of completion will be issued to each participant. As such, it does not include content that may be deemed or construed to be an approval or endorsement by RCEP.

4 Purpose and Learning Objectives Outline key changes in NFPA 70E 2012: Standard for Electrical Safety in the Workplace and strategies for risk reduction to mitigate electrical hazards Discuss OSHA 29 CFR Part 1910 known as Subpart S.

5

6

7 Speakers Daleep Mohla, Owner and Principal Consulting Engineer for DCM Electrical Consulting Services Bob Vavra, Plant Engineering Content Manager and Moderator

8 NFPA 70E An overview of changes Presenter: Daleep Mohla, P.E, IEEE Life Fellow DCM Electrical Consulting 8

9 Interpretations? Although the presenter is a member of the Technical Committee for NFPA 70E the views and opinions expressed in this session are presenter s and are not to be considered an official interpretation of the NFPA 70E. See 70E, 90.6 for process for formal interpretations 9

10 Changes in 70E In this session, Changes in 70E are indicated by yellow underlined font or by shaded areas in cut-and-paste information in the tutorial 10

11 Important This short session only covers a very few changes in NFPA 70E 2012 edition. Mainly in Article 110 with overview of other articles Subsequent sessions will cover other changes. Attendees are encouraged to read 70E-2012 for all the changes and how it applies to their facilities. 11

12 Scope Article 90 Scope has been revised to align with the NEC for what is covered or Not covered NEC covers installation. 70E covers safety related work practices. Changes in the scope reflect this. 12

13 Added Scope This standard also includes safe work practices for employees performing other work activities that can expose them to electrical hazards as well as safe work practices for the following: (rest of the scope is identical to NEC 2011) 13

14 Definitions This definition has not changed and is included for information only Qualified Person. One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved. 14

15 AR is NOT same as FR! Informational Note No. 1: Arc-rated clothing or equipment indicates that it has been tested for exposure to an electric arc. Flame-Resistant (FR) clothing without an arc rating has not been tested for exposure to an electric arc. 15

16 Boundary, Arc Flash Informational Note: A second degree burn is possible by an exposure of unprotected skin to an electric arc flash above the incident energy level of 5 J/cm 2 (1.2 cal/cm 2 ). 16

17 Relationship with Contractors 110.1(A) Host Employer Responsibilities Discuss known hazards Information about employer s installation Report observed contract employer-related violations to contract employer 17

18 Relationship with Contractors 110.1(B) Contract Employer responsibilities Ensure their employees are aware of all hazards communicated to contractor by host employer Provide basic safety training required by NFPA 70E Ensure their employees follow work practices required by NFPA 70E and safety-related work practices required by the host employer 18

19 Relationship with Contractors 110.1(B) Contract Employer responsibilities Advise host employer of the following: Any unique hazards presented by contractor s work Any unanticipated hazards found during work Measures contractor took to correct any violations reported to contractor by host employer to prevent recurrence of the incident 19

20 Relationship with Contractors 110.1(C) Documentation There shall be a documented meeting between the host employer and the contract employer 20

21 Training Requirements 110.2(A) Safety Training Training requirements outlined in NFPA 70E shall apply to all employees who face a risk of an electrical hazard 21

22 Training Requirements 110.2(B) Type of Training Training shall be class room or on-the job or a combination of the two. Degree of training shall be determined by the risk to the employee. 22

23 Training Requirements (D)(1)(f) The employer shall determine, through regular supervision or through inspections conducted on at least an annual basis that each employee is complying with the safety-related work practices required by this standard. 23

24 110.2(D)(2) Unqualified Persons Unqualified persons shall be trained in, and be familiar with, any electrical safety-related practices necessary for their safety. 24

25 Retraining Required when? 110.D(3) supervision or annual inspections indicate that the employee is not complying with the safety-related work practices. new technologies, new types of equipment, or changes in procedures necessitate the use of safetyrelated work practices that are different from those that the employee would normally use. he or she must employ safety-related work practices that are not normally used during his or her regular job duties. 25

26 Retraining Required when? Every three years as a minimum 110.2(D)(3) Retraining shall be performed at intervals not to exceed 3 years. 26

27 110.2(E) Training Documentation Employer shall document that each employee has received the training required by article 110.2(D). after the employee demonstrates proficiency in the work practices involved. Documentation shall be maintained for the duration of the employee s employment. Documentation shall contain the content of the training, each employees name, and dates of training. 27

28 110.3 Electrical Safety Program 110.3(A) General: The employer shall implement and document an overall electrical safety program that directs activity appropriate for the electrical hazards, voltage, energy level, and circuit conditions. 28

29 110.3 Electrical Safety Program 110.3(H) Electrical Safety Auditing The electrical safety program shall be audited to verify the principals and procedures of the electrical safety program are in compliance with this standard. Field work shall be audited to verify the requirements contained in the procedures of the electrical safety program are being followed. 29

30 Article 120 Covers Establishing an Electrically Safe Work Condition Lockout/Tagout Issues Temporary Protective Grounding Equipment 30

31 Electrically Safe Work Condition Electrically Safe Work Condition. A state in which an electrical conductor or circuit part has been disconnected from energized parts, locked/tagged in accordance with established standards, tested to ensure the absence of voltage, and grounded if determined necessary. 31

32 120.1 Process of Achieving an Electrically Safe Work Condition Apply lockout/tagout devices in accordance with a documented and established policy. 32

33 Article 130 Covers When the employer can justify work without an electrically safe work condition AND What mitigation is required to protect employees 33

34 Written Permit Requirements Expanded ( B) (1)When Required. When working within the limited approach boundary or the arc flash boundary of exposed energized electrical conductors or circuit parts that are not placed in an electrically safe work condition (i.e. for reasons of increased or additional hazards or infeasibility as per 130.(2)(A) work to be performed shall be considered energized electrical work and shall be performed by written permit only. p 199APR 34

35 Equipment label (c) New requirements for label Clarifies where they are required Consistent with National Electrical Code

36 Article 130.7(C)(15) IN No. 2 Informational Note No. 2: The collective experience of the task group is that in most cases closed doors do not provide enough protection to eliminate the need for PPE for instances where the state of the equipment is known to readily change (e.g., doors open or closed, rack in or rack out). 36

37 Tables 130.7(C)(15)(a) and (b) Formerly 130.7(C)(9) Now two tables One for ac 130.7(C)(15)(a) One for dc 130.7(C)(15)(b) New table for choosing HRC for dc power systems Notes from bottom of Table are now in headers Should make them more noticeable New notes added giving Arc Flash Boundary and working distances are added to header, as well 37

38 Hazard and Risk reduction Remove Hazard or reduce risk? Removal of hazard is better but has to be done during design ( change of equipment etc. may be needed) Use of Arc Resistant Switchgear Use of lower voltages ( battery operated tools) 38

39 Risk reduction Risk is the probability of event occurring Arc flash is caused by arcing and high currents flowing during the fault 80-95% of faults start as phase to ground faults Ground fault current can be reduced by use High resistance grounding ( only 5 amperes of so flow during the first ground fault 39

40 Risk reduction Minimize probability of arcing by preventive maintenance and having an advance warning of impending faults. How? Maintenance requires a shut down! 40

41 How? Risk reduction with no unplanned shutdown Perform Infrared thermography to determine hot spots due to overload and arcing. Do it safely by installing infrared windows on equipment to monitor critical locations. Only take an outage if needed. Minimize arcing- Reduce arc flash hazards 41

42 NFPA 70E Thank You Presenter: Daleep Mohla, P.E, IEEE Life Fellow DCM Electrical Consulting 42

43

44 Questions and Answer Session Ask a panelist a question by entering your question in the Question & Answer box and click submit

45 Arc Flash University, Session 2: NFPA 70E- 2012: Key Changes and Risk Reduction Strategies Sponsored By: