Arc Flash & Electrical Safety News

Blog Author Steve Hudgik

Tuesday, February 21, 2012

Arc Flash Analysis: IEEE Method versus the NFPA 70E Tables

Schneider Electric Engineering Services has just published a white paper that compares the IEEE method for doing an arc flash analysis with the NFPA 70E table method.  The white paper is available online at:

http://static.schneider-electric.us/docs/Electrical%20Distribution/Services/1910DB1201.pdf

The following is the abstract from the paper describing the subject of this white paper:

"Recent changes in workplace safety regulations have heightened the awareness of hazards associated with electrical arcs. The hazard level must be quantified and workers properly protected before entering proximity of exposed energized conductors. National Fire Protection Association’s (NFPA) standard 70E provides the guidelines for work involving electrical hazards and the selection of arc flash
protective equipment. In order to properly select the protective gear one must have knowledge of the potential thermal energy of the electric arc. Institute of Electrical and Electronics Engineers (IEEE) standard 1584 has been the de facto standard for calculating the arc energy levels at different points in the electrical power system."

"However, NFPA 70E also provides the option of using the Hazard/Risk Category (HRC) task tables for personal protective equipment (PPE) selection. These tables provide pre-defined levels of PPE, which are based on the available short circuit current and the speed of the overcurrent protective device. Therefore, in order to properly apply the tables, some degree of electrical calculations must be performed and the tables could be subjected to misuse if they are applied without knowledge of the necessary calculations."

"In this paper the basic differences between the IEEE 1584 method and the NFPA 70E task tables are discussed and a recommended specification is provided for facility owners who are interested in achieving compliance with the regulations."

This white paper includes a brief mention of the need for arc flash labels as required by NFPA 70E.  DuraLabel printers make NFPA 70E compliant arc flash labels that also are formatted they way you want. Your have your choice of using the built-in template and database, or creating your own arc flash label format.  Plus, with a DuraLabel printer making labels is fast and easy. Find out more. Call 1-888-326-9244 today and ask about the special DuraLabel arc flash labeling kits. You'll be glad you did.

Related Past Posts:
Marine Arc Flash 
Follow Standards When Selecting PPE For Arc Flash
Putting Arc Flash Calculations Into Perspective 

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