De-energize and lock out/tag out the motor circuit
Verify absence of voltage
Disconnect the motor from the drive or wiring if required by the test procedure
Inspect the motor nameplate for insulation voltage rating
Select the correct megohmmeter test voltage
Set the megohmmeter to the appropriate voltage range
Connect one lead to the motor winding terminal
Connect the other lead to the motor frame or ground
Test each winding separately
Press and hold the test button for the required duration
Record the insulation resistance reading
Repeat the test for all winding-to-ground combinations
If testing phase-to-phase, connect leads between windings and record readings
Discharge the motor windings after each test
Compare readings to manufacturer or site acceptance criteria
Reconnect the motor only after the motor is fully discharged and safe to handle