An estimated 75-80% of all serious electrical injures are related to electrical arcs created during short circuits, ground faults, and switching procedures. In recognition of this fact, standards organizations have provided the industry with techniques to evaluate the magnitude of the electrical arc flash hazard and recommend appropriate protective clothing and equipment.
The principal factors used to determine the arc flash hazard are:
1) Available short circuit current at the arc location
2) Duration of the electrical arc
3) Distance from the arc to personnel
4) Arc gap.
To accurately assess the arc flash hazard and make appropriate decisions regarding personal protective clothing and equipment, it’s necessary to understand fully the operation of the system under fault conditions.
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