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Marc: That would have been by suggestion, though I know nothing about GFCI's. Guess I really should get off my tushie and investigate these buggers.

So many electricians utilize a continuity tester for trouble shooting, and while they will show a dead short, they are no good for leakage currents minimal insulation break downs.
 

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Marc:

I have a small (8" long X 2 X 2) digital perfect for a tool box I'll post tomorrow.

went to a service call GFP tripped switchboard looked a mess and the electrician was going to close the main. I told him on the phone NO WAY WAIT FOR ME. He had used a ohm meter and it read clear, megger the board and it meggered less that .3 megohms. I always try to tell them they need a little UMPH. 1000 VDC versus 9 VDC of a typical ohm meter.
 
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