The National Fire Protection Association (NFPA) published the latest edition of the NFPA
70E Standard (Standard for Electrical Safety Requirements for Employee Workplaces) in
2004. The revised version requires employees to wear flame resistant (FR) protective
clothing that meets the requirements of ASTM F1506 wherever there is possible
exposure to an electric arc flash. It requires employers to perform a flash hazard
analysis to determine the flash protection boundary distance. The standard is designed
to protect employees working inside these flash protection boundaries by requiring
protective clothing for corresponding Hazard/Risk Category that has an arc thermal
performance value (ATPV) of at least the value listed in the “Protective Clothing
Characteristics” section of the standard (see table above). The vast majority of major
companies in the U.S. have some employees who work on or near energized
electrical conductors or circuit parts. In addition, the Department of Energy has
required that federal and contractor employees comply with NFPA 70E and the
2002 National Electric Code (NEC) references the NFPA 70E standard. Finally,
OSHA considers the NFPA 70E standard a “recognized industry practice.”
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