Description of Incident
An arc flash occurred during de-isolation switching in a 690V switchboard for a hydraulic starter module. The arc flash was inside the lower area of the tier displacing the vent panel. The initial pre-trip current was approx. 500 amps and increased to approx. 17,000 amps during flash across the supply side of the fused isolator. The nearest person was in immediate proximity to the module. The arc did not make contact with any personnel.
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