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It’s true that “Bob” has extensive experience. And he’s probably a fine electrician.

Electrical Troubleshooting Quiz - March 24, 2015

Your legally required standby system at your facility kicks in a few times each year, and twice over the past 12 months, it’s had two incidents.

The legally required standby system at your facility kicks in a few times each year. Twice over the past 12 months, it’s had two incidents. First, a feeder breaker tripped for no apparent reason; subsequent investigation revealed a branch circuit problem coincident to this. The second incident was similar, but on a different feeder breaker.

The plant manager rejects the idea there’s a selective coordination problem, because “Bob” set all the breakers and he h

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