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The exposure to an arc flash high incident energy fault to technicians operating low and medium voltage switching equipment is a daily hazard in the workplace and there is an opportunity to improve safety. While PPE protects for first and second degrees burns it could not provide sufficient protection for the impact and forces that a high incident energy arcing fault produces and the gases released...
Properly analyzing power system clearing times is vital in determining what the actual hazards are. These clearing times are measured in cycles or milliseconds. Many arc flash hazard analysis are done using the relay curve of a protective device when the actual clearing time of the circuit involves many more devices such as CT's, interposing relays and circuit breaker action. This actual clearing...
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