The National Fire Protection Association (NFPA) 70E is a comprehensive standard that establishes best electrical safety practices standards on how to protect workers from electric arc flash and arc blast exposure and resulting potential injury and death.
Most people working with electricity only require clothing that meets category 1 (ATPV 4 cal/cm²) or 2 (ATPV 8 cal/cm²) protection characteristics.
NFPA 70E electrical safety standards are aimed more towards those workers who work in category 3 (ATPV 25 cal/cm²) or 4 (ATPV 40 cal/cm²) hazard situations. Their clothing must meet ATPV rating minimums throughout the life of the garment.
|Hazard Risk categories||ATPV (cal/cm²)|