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Electrical Troubleshooting Quiz - August 5, 2014

Should you look at insulation leakage when there are voltage imbalances?

Your plant has a high rate of motor failure. You find voltage imbalances on several feeders and branch circuits. Meeting with the plant engineer, you identify the imbalances as the cause of the motor failures. He looks over the measurements you took on one feeder picked at random. The average voltage is 479V. Two of the phases are pretty close to that, but C Phase is 467V. That makes for a voltage imbalance of about 2.5%. Because the deviation is toward lower voltage, the plant engineer i

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