| Lockout - Rack Out |
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Question:Large power distribution circuit breakers look nothing like the small breakers seen in residential and commercial electrical systems. They are large units, which "plug" into cubicles so as to facilitate removal and replacement for routine maintenance. When securing an electrical system in a zero energy state prior to commencement of maintenance work, it is common practice to "rack out" any large circuit breakers feeding power to the system. What exactly does this term mean, and what is the procedure for "racking out" a circuit breaker? Answer:To "rack out" a circuit breaker means to unplug it from its cubicle so that it cannot conduct electric power to the circuit where work is being performed, even if someone were to close its contacts. |
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