Red Seal Industrial Electrician Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What tool is used to test the insulation resistance of a motor?

A multimeter

A megohmmeter

The tool specifically designed to test the insulation resistance of a motor is a megohmmeter. This instrument applies a high voltage (typically between 250V and 1000V) to the insulation system of the motor to determine its resistance in megohms. Insulation resistance testing is crucial for assessing the condition of the motor's insulation, helping to prevent failures caused by insulation breakdown, which can lead to short circuits and motor damage.

A multimeter, while versatile for measuring voltage, current, and resistance, does not supply the high voltage needed for accurate insulation resistance testing. A power meter measures electrical power in a circuit, offering insight into power consumption rather than insulation condition. An ammeter measures current flow, which is not relevant for assessing insulation integrity. Therefore, the megohmmeter is the correct and essential tool for this specific purpose.

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A power meter

An ammeter

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