Guide to Low Voltage Motor Testing

The Guide to Low Voltage Motor Testing compares various types of AC and DC motors and configurations and stresses the importance of early detection and diagnosis of motor faults for preventative maintenance. The guide introduces various low voltage motor tests, including insulation resistance testing and tutorials on how-to meg a motor, inductance testing for determining stator problems, voltmeter measurements for ensuring the supply remains within nameplate voltage, low resistance testing and various other motor testing procedures.


Please note, this guide uses the MTR105 – Megger’s multifunctional rotating machine tester – to easily introduce and demonstrate each of these low voltage tests with a single instrument. However, the information in this booklet is transferrable to other test instruments that can be used for low voltage motor testing.

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