Most arc flashes don't last very long because the source of the electricity is cut off quickly by circuit breakers or other safety equipment. The traumatic force of an arc blast can severely injure or be deadly to those in the near vicinity as well as damage just about everything nearby.Īn arc flash can last anywhere from a fraction of a second to several seconds, depending on a number of factors. This supersonic shockwave is the result of the arc flash and the newly ionized air vaporizing any metal conductors within the unit. If the conditions are right, an arc flash can reach the final stage and result in an enormous electrical explosion known as an arc blast. Think of an arc flash as the extreme heat and blinding light produced by the arc fault. The next event in this progression is referred to as the arc flash. The progression of an arc flash event starts with an arc fault, which is essentially a short circuit conducted between two live parts, or by one live part and one ground, creating ionized air.
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