Case Study 7: Overhead Crane Servicing and Maintenance

A millwright is assigned to a servicing and maintenance task on an overhead crane. The employee initiates the prescribed energy control procedure by closing the crane's electrical disconnect switch and placing his lock onto this energy isolating device.

However, the disconnect switch lever is corroded, allowing it to physically separate from the disconnect switch assembly. As a result, when the millwright places the lock on the lever in the "off" position, the stub located inside the electrical box remains in the "on" position. The employee does not attempt to verify deenergization by using the crane start button. When he contacts the energized electrical bus bar located near the bridge railings, fatal injury results.

This repairman was trained in the requirements of the Lockout/Tagout standard as an authorized employee. He was not, however, trained as a qualified person under the Electrical-Safety-Related Work Practices standard.

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