A meggh-ohm test is performed on a motor to test the condition of the insulation on the windings.

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Multiple Choice

A meggh-ohm test is performed on a motor to test the condition of the insulation on the windings.

A megohm test checks insulation resistance by applying a high DC voltage to the motor windings and measuring leakage current. The key idea is that good insulation presents high resistance, so you want readings in the megohms range. If the insulation is deteriorated, moisture, dirt, or damage create leakage paths and the resistance drops. For motors, you typically measure between each winding and the ground (and sometimes between windings) with the motor de-energized. A high insulation resistance indicates the windings’ insulation is still sound, while a low reading signals potential insulation problems that could lead to failure. So the statement is true: a megohm test is used to test the condition of the insulation on the motor windings.

A megohm test checks insulation resistance by applying a high DC voltage to the motor windings and measuring leakage current. The key idea is that good insulation presents high resistance, so you want readings in the megohms range. If the insulation is deteriorated, moisture, dirt, or damage create leakage paths and the resistance drops.

For motors, you typically measure between each winding and the ground (and sometimes between windings) with the motor de-energized. A high insulation resistance indicates the windings’ insulation is still sound, while a low reading signals potential insulation problems that could lead to failure.

So the statement is true: a megohm test is used to test the condition of the insulation on the motor windings.

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