Electricians were removing an electrical panel box inside a pond control house to perform a service upgrade. Electrical cut-outs at the pole were pulled thereby de-energizing the building, a lockout/tagout was issued, and energy checks were performed at the panel. In preparation for the panel removal, a portable generator was used to power needed environmental equipment controls inside the building. During the panel box removal, electricians cut through a 110 VAC circuit that was back fed from a portable generator, it had been passed through the panel box and routed to a pH control valve outside the building. When the Electrician pulled the wires through conduit prior to panel removal, the pH level in the holding pond had increased and the pass through circuit became energized. The Electricians noticed a spark on the back of the main panel and immediately stopped.
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