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Arc Flash Hazard Assessment


The results of the arc flash hazard assessment are commonly given by the following two parameters: Incident Energy and Arc Flash Boundary.

Incident Energy

Incident Energy (kJ/m2 or cal/cm2) is the heat energy resulting from an electric arc, measured at a unit surface area at a specified distance from the electric arc.

It defines arc flash severity at the worker’s distance from the electric arc. 1.2cal/cm2 applied to skin for 1 second results roughly in the threshold energy for onset of second-degree burns.

Arc Flash Boundary

“The boundary within which a person could receive a second-degree burn from an arc flash incident”. (IEEE 1584)

See our worked illustration of Incident Energy level and Arc Flash Boundary calculations

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