SOLVED - GFCI - should my neutral and ground have continuity?

by Max   Last Updated July 11, 2019 21:21 PM - source

i have a thing i'm doing.. i won't go into detail. but i have a thing that is a yellow solid core copper cable with a hot, neutral and bare ground. one end is connected to a plug i wired (i'm using the cable thingy as a makeshift cord because i don't have an actual cord). the other end is wired to the LINE of a gfci.

just to make sure i had no short circuits before i was to install my thingy, i checked continuity between the Hot, Neutral and Ground terminals on the GFCI to make sure there were no shorts in my wiring. when i touched the HOT and NEUTRAL prongs, they had continuity. (my continuity tester is really just an ohmmeter). so did HOT and GROUND. i unddid the plug and looked for shorts, and there were none. i put it back together and now i see tthat only the NEUTRAL and GROUND are continuity.

is this a break in my cable shorting the two? or is it a faulty GFCI?

no this is not connected to the wall yet. this is an isolated circuit i was testing for continuity.

help i dont want this to end up shorting the HOT and NEUYTRAL again and starting a fire

EDIT: i was stupid in the plug and put the wires overlapping.. the thig that clamps down ended up pushing insulation away and shorted the wires. i am going to not make that mistake again.

Answers 1

Safety ground is continuous through a GFCI.

LINE neutral to LOAD neutral is not continuous.

LINE hot to LOAD hot is not continuous.

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As you can see, both hot and neutral go through the mysteryworks of a GFCI device. (actually, that includes a set of relay contacts, and also a current-sensing inductor, so you may read an impedance near zero.) Needless to say, if the relay contacts are open, line-load will read as dead open... IIRC the GFCI also has some electronics between LINE hot and LINE neutral, so you may also expect some non-infinity impedance there.

Now, look close: you see that green "upside down T" where the ground wire branches into the GFCI? No, you do not see that "T"? That's because GFCIs don't connect to ground. GFCI receptacles do, but only for the sake of the receptacle sockets; the GFCI portion doesn't use it.

July 11, 2019 20:55 PM

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