While troubleshooting the loss of power in cubicles at PNNL's new 3860 Building in March, electricians discovered an energized power distribution assembly (PDA) in recently installed cubicle partitions. The subcontractor tasked with this work scope, which was a change to the original scope, ran out of parts during the installation; there were not enough receptacles and cover plates available to shield the energized components. The subcontractor assumed it was acceptable to leave them uncovered and energized until additional parts were available.
Lessons Learned: Recognize that scope changes or additions, no matter how minor, may invite additional risk. Provide adequate oversight of work performed by subcontractors, who may not be knowledgeable on PNNL's requirements. Consult equipment manufacturer's instructions to assure hazards are recognized and controlled.
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