It is very important that all electricity supplies are isolated to keep anyone working on or near the equipment safe.
EnergySafety Western Australia reported the deaths of two electricians after a 11kV oil-insulated Long and Crawford combined-fuse switch exploded due to a high current fault occurring in the unit's tank. Most of the insulating oil in the tank evaporated immediately. While the investigation is not complete, it appears there was a short-circuit fault in the switch tank following the rupture and disintegration of a high-voltage fuse within the unit.
EnergySafe has placed a ban on performing work on any of these units until all electrical supplies have been isolated. Visit the EnergySafety website for more details about the safety order.
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