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This guide uses the specific tests of the Megger Baker MTR105 to demonstrate the importance and application of these tests for low voltage machines rated up to A program of regularly scheduled insulation testing with a megohmmeter can increase motor safety by minimizing the risk of electric shock and electrical fire. How To Test Three - Phase AC Motors For the three-phase motor, do the following: (1) Check the appearance of the motor. Check for burnt, damage to body orTo make these measurements, it will be necessary to perform the following: Disconnect the motor from the power supply and connect a megger between the windings. The goal is to eliminate removal and repair of motors that are not defective. Required Tools and Materials. Use a Megger with applied test voltage suitable for Connect a megohmmeter to measure the resistance of each winding lead to ground. Record the readings after. 60 sec. 2. Discharge the motor windings. An