Arc-Flash Hazard Analysis Studies

The purpose of the arc flash study is to determine the protective clothing requirements for persons working on live or electrically energized equipment (whenever feasible and possible).

The arc flash calculations combine fault calculations, protective coordination and empirical equations to calculate arc energy that people may be exposed to when working on or near electrical equipment. By calculating the expected arc energy, protective clothing can be specified that can safely protect people with respect to the arc flash
exposure within the calculated energy limits of such clothes. If the calculated energy is beyond the protective clothing’s exposed limits, then no protection to people can be offered through protective clothing.

Therefore, working on live electrical equipment with energy limits that exceed any protective clothing will be prohibited, and even the
approach to this equipment at a specified distance cannot be allowed.
There is no pre-requisite study for arc flash hazard analysis, but for possible solutions to lower the calculated arc energy, SC and coordination studies are strongly recommended.

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