Electrical Troubleshooting Quiz - April 4, 2017 tuk69tuk/iStock/Thinkstock

Electrical Troubleshooting Quiz - April 4, 2017

Knowing the failure mode of a faulty cable makes it much easier to determine the cause.

The plant has a 400-hp motor that drives a big compressor for the plant air system. A few months ago, it was tripping its feeder overcurrent protection device (OCPD) on a regular basis. The plant engineer suspected a problem with the motor windings, so he brought in a thermographer to check things out.

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