When arc flash PPE was first being discussed by the NFPA, it was typical to describe PPE as Category 0, Category 1, Category 2, Category 3, Category 4, or Dangerous. See Table 130.5(G) for further information. * note This simplified list is not the complete and official position of the NFPA on the referenced subject, which is presented only by the standard in its entirety. Incident energy exposures equal to 12 cal/cm2 up to 40 cal/cm2 Weather appropriate arc-rated gear as needed.Hard hat, safety glasses, hearing protection, and leather footwear.Rubber insulating gloves with leather protectors.Arc-rated faceshield and arc-rated balaclava OR arc flash hood.Arc-rated clothing (long sleave shirt, long pants).Incident energy exposures equal to 1.2 cal/cm2 up to 12 cal/cm2 Simplified PPE list based on NFPA 70E Table 130.5(G) In 2018, this arbitrary cutoff was removed from an informational note with the intent that great emphasis with respect to de-energizing is always necessary regardless of the energy being 4 cal/cm2 or 40 cal/cm2.
In practice, 40 cal/cm2 was often the cutoff for “safe” work and the highest PPE incident energy level described in 70E until 2018. The second level is from 12 cal/cm2 up to 40 cal/cm2 ( or greater). The first level is from 1.2 to 12 cal/cm2.
The Arc Flash Institute recommends most facilities consider a two-level PPE program as outlined in NFPA 70E Section 130.5(G) and Table 130.5(G). When working within the arc flash boundary, and when a risk analysis determines that there is a likelihood of occurrence of an arc flash event, then arc flash PPE shall be worn. Arc flash personal protective equipment (PPE) is required by OSHA and described in NFPA 70E.
0 kommentar(er)
