Control Panel Presents Unique Challenges to Lockout/Tagout
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Type:  Lessons Learned

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

Published As:  Public

Date: 

Topics:  Electrical, Operations, Maintenance, Hazardous Energy Control

While a Control Panel was being locked out (single point isolation) for the purpose of recovering instrumentation within the panel, a previously unidentified power source was discovered. The electrical diagrams that were reviewed did not reflect the control power that was also supplied to the Control Panel; however the control power circuit was reflected on other drawings that were not reviewed during lockout/tagout preparation.

Lesson Learned: Control panels (and instrument panels) are complex and often contain multiple electrical components requiring additional rigor when determining, reviewing, and approving a lockout/tagout electrical isolation boundary. All drawings should be reviewed and qualified electricians should be involved in identifying isolation boundaries.

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