Refer to the simplified drawing of an electrical distribution system showing 7.2 KV switchgear, step-down transformers, and 480 V motor control centers (MCCs) (see figure below).
The high voltage side of each step-down transformer has a remote-operated disconnect to allow transformer maintenance while keeping the other transformers in service.
The control circuit for each disconnect is position-interlocked with the associated MCC feeder breaker.
Which one of the following describes the purpose served by the interlock?
A. Prevent damage to the disconnect.
B. Prevent damage to the transformer.
C. Prevent damage to the feeder breaker.
D. Prevent damage to the 480V MCC.
Show Answer
Answer: A
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