The National Electrical Manufacturers Association (NEMA), Rosslyn, Va., recently released two papers that address the hazard of electric arc flash. Avoid Arc Flash Occurrences by Following Industry Standards introduces the hazard and the industry codes, and standards that address it, as well as requirements that facilities must comply with in order to reduce injuries, occurrences, and down time.
The second paper, Molded-Case Circuit Breakers Reduce Arc Flash Hazard Impact, identifies the impact on arc flash by molded-case circuit breakers and provides methods of determining the magnitude of the flash.
Electronic copies of both documents can be downloaded for free at www.nema.org/r/wp/arc-stds/ and www.nema.org/r/wp/arc-mccb/, respectively.
