Forum,
From everything I've read / heard, when checking the insulation of a three-phase motor you use a Megger going from each phase to ground, but then a regular continuity tester for phase-to-phase checks. Is there a particular reason for that? Could Megging phase-to-phase possibly damage the motor, or is it safety-related in that you want to avoid messing with high DC voltages as much as possible? Please advise
From everything I've read / heard, when checking the insulation of a three-phase motor you use a Megger going from each phase to ground, but then a regular continuity tester for phase-to-phase checks. Is there a particular reason for that? Could Megging phase-to-phase possibly damage the motor, or is it safety-related in that you want to avoid messing with high DC voltages as much as possible? Please advise