"and I'll repeat it here, gfci doesn't need a ground wire on the tool to work not sure why people think that. Its just watching for imbalance on the hot and neutral."
Ken, YOURE EXACTLY RIGHT and Ive had licensed union electricians say thats incorrect???
Theres a Torroidal Coil that encircles the Hot and Neutral (NOOOOO Ground involved whatsoever) so as long as the current being returned in the Neutral is the same as that going out the Hot THERES NO NET CURRENT AND NO VOLTAGE IS INDUCED INTO THE CORE. HOWEVER if theres a leakage of 5 milliamps (like to frame or ground or anywhere but the Hot) that current difference yields a voltage induced into the coil which triggers the trip.
John T Long retired EE but still remember the basics
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