Shock Incident at the ARC1 Box Power Supply in the LERF Building

Image for Shock Incident at the ARC1 Box Power Supply in the LERF Building

Type:  Lessons Learned

Publisher:  Thomas Jefferson National Accelerator Facility, Newport News, VA

Published As:  Public


Topics:  Electrical, Work Management/Planning, Laboratory, Hazardous Energy Control

When performing a design/operational review of a system made up of different components, include a review of the system as a whole.

Two technicians were diagnosing a magnet problem within the Low Energy Recirculating Accelerator Facility (LERF). The ARC 1 480 volt input power supply for the magnet was located in a top-side gallery. The magnet/magnet string was located in the LERF vault. After applying a lock and tag to the power supply, and confirming its voltage verification unit showed the power supply was de-energized, one of the technicians began removing a direct current output conductor. During the work their elbow brushed against the grounded cabinet frame and they received an electrical shock. The unexpected voltage was measured to be 87 volts. The problem was not anticipated and therefore analysis of the systems hazards was not performed and mitigated.

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