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Employees during activities such as installation, operation, maintenance and demolition of exposed energized electrical conductors or circuit parts. Research shows that approximately 10% of the employees in any operation work as electricians, maintenance, or other categories of work covered by this standard.
OSHA believes that the NFPA 70E standard offers useful guidance for employers and employees attempting to control electrical hazards, but OSHA has not conducted a rule making and therefore does not "enforce" NFPA 70E. OSHA does use consensus standards, such as NFPA 70E as evidence of hazard recognition in evaluating General Duty Clause violations.
NFPA 70E is available from NFPA, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101; phone 1-800-344-3555; or online at http://catalog,
The standard requires that arc rated garments have a minimum Arc Thermal Performance Value (ATPV) based on the hazard/risk analysis for the task being performed. The ATPV is expressed in calories per square centimeter and represents the protection from electric arcs provided by the garment. If the ATPV cannot be calculated because the fabric brakes open, the energy causing the break open is expressed as the Break open Threshold Energy.
Arc ratings are included on Bulwark garment labels and in the Bulwark catalog and Wholesale Product Guides. This information is also available at
Probably not. Non-melting flammable garments are only allowed for HRC 0 exposures. Employees must wear fire-resistant clothing wherever there is a possible exposure to an electric arc flash above the threshold incident-energy level for a second degree burn.
Layering of non-melting flammable garments is permitted to be worn under fire-resistant garments for added protection.