Reply by EEngineer

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Posted on GFIC outlet and my Performax 10-20 won't play together.

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1103 posts in 3641 days

#1 posted 08-13-2012 04:11 AM

GFCI compares the current in the “hot” wire with the current in the “neutral” wire. Any difference (a difference as little as 5 milliAmps will cause the GFCI to trip) between the two currents must be taking a different path than from the “hot” through the application to “neutral”. The most dangerous case is where that path is through a person’s body to ground, also known as electrocution.

Now, there are lots of possibilities for where the current path might be BUT the most common case is a breakdown in the varnish used as insulation on the wires in the motor windings. Except in the most extreme cases, you are not going to be able to measure that with a voltmeter. They generally drive the ohms function with a few volts. Varnish breakdown doesn’t show up until the voltage is 100 volts or higher. In general, you need a “hi-pot” tester (high potential) that measures leakage with a high voltage applied to the motor. Any decent motor shops will have this equipment.

-- "Find out what you cannot do and then go do it!"

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