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Measuring a downstream GFI plug

Posted by jbstx1 (My Page) on
Tue, Apr 30, 13 at 8:59

Hi, I was wanting to tie into my plug receptacle that supplies power to my garage door opener. It is in the ceiling and is apparently supplied by my garage gfi receptacle. I turned off the supply breaker to this and tied into the ceiling plug. I measured phase to phase and was alarmed that i had continuity from black to white. I did not think this was normal. Is this a function of the gfi circuit??


Follow-Up Postings:

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RE: Measuring a downstream GFI plug

Was anything plugged into the circuit?

A turned on load on the circuit would create a connection from hot to neutral.


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RE: Measuring a downstream GFI plug

I have a radio and a freezer that was plugged in to the GFI outlet at the time. Would this cause a short across the black and white?


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RE: Measuring a downstream GFI plug

You betcha. A motor is pretty much a dead short to DC measurements.


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RE: Measuring a downstream GFI plug

" A motor is pretty much a dead short to DC measurements."

Bingo.
Especially when it is not turning and you are measuring with a DC voltage.


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