Unusual Generator Configuration Presented Electrical Hazard

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Type:  Just-In-Time Report

Publisher:  CH2MHill Plateau Remediation Company (Richland, WA - Hanford Site), Richland, WA - Hanford Site (CHPRC)

Published As:  Public


Topics:  Electrical, Contracts and Procurement, Operations, Maintenance, Hazardous Energy Control

A subcontract well drilling company brought a 480 VAC diesel powered generator to the Hanford Site from a local rental company. The manufacturer/model are Doosan Infracore Portable Power/G70 WCU-3A-T41 Year 2014. The generator is used to power a temporary well pump during the well development process. The next day, following connection of the power cables between a pump control panel and the generator, the driller requested assistance from the National Electric Code inspector to determine proper grounding of the generator. As additional questions arose, review by the Buyers Technical Representative and Drilling Manager determined that a potential hazardous energy control issue exists.

The normal configuration of generators used at the project does not require hazardous energy controls when connecting or disconnecting power cables. This generator does not provide electrical separation between the high voltage buss work and the cable connectors.

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