Incident energy of an arc flash can be best explained with a simple campfire analogy. The massive energy released in the fault rapidly vaporizes the metal conductors involved, blasting molten metal and expanding plasma outward with extraordinary force. Many of these workplace injuries result from arc flash, a type of electrical explosion that occurs due to a low-impedance connection to ground or another voltage phase in an electrical power system.Īrc flash temperatures can reach or exceed 35,000 ☏ (19,400 ☌) at the source of the arc. Numerous workers are injured or killed each year while working on energized electrical equipment. Arc Flash Hazards: NFPA 70E Working Boundaries Explained 897×550 107 KB
