Measuring a downstream GFI plug

jbstx1April 30, 2013

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??

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brickeyee

Was anything plugged into the circuit?

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

    Bookmark   April 30, 2013 at 9:43AM
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jbstx1

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?

    Bookmark   April 30, 2013 at 10:28AM
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Ron Natalie

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

    Bookmark   April 30, 2013 at 11:22AM
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brickeyee

" 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.

    Bookmark   April 30, 2013 at 2:58PM
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