PE Electrical Power Practice Questions - PE Electrical And Computer Power Exam

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A megohmmeter reads 250 MΩ on a 480 V motor winding at 40°C. Per IEEE 43, the recommended MINIMUM insulation resistance for this machine (rated voltage + 1 kV at 40°C) is approximately:

1 MΩ 5 MΩ 100 MΩ 1000 MΩ

Correct Answer:

1 MΩ

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