NFPA 70E is a voluntary standard published by the National Fire Protection Association which covers the full range of electrical safety issues, including safety related work practices, maintenance, special equipment requirements, and installation. It establishes thresholds for worker protective apparel based on exposure to arc hazard risk. It’s designed to protect workers that install, maintain or repair electrical systems.
Protective Clothing Characteristics
| Hazard Risk Category |
Clothing Description (Number of layers in parenthesis) |
Minimum ATPV Rating of PPE (Cal/cm2) |
|
| 0 | Non melting flammable materials (1) | N/A | |
| 1 | FR shirt and FR pant or FR coverall (1) | 4 | |
| 2 | Cotton underwear plus FR shirt and FR pant or FR coverall (1-2) | 8 | |
| 3 | Cotton underwear plus FR shirt 25 and FR pant or FR coverall (2-3)ts | 25 | |
| 4 | Cotton underwear plus FR shirt 40 and FR pant plus double-layer switching coat and pants (3-4) | 40 |