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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 turning
"off" 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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