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#163853 - 05/18/07 10:22 PM two wire and GFCI
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
The NEC clearly states that a two wire receptacle can be replaced with a GFCI.
I did that, however, when i test the GFCI with a lightbulb load, hot to ground the GFCI does not trip.

I thought it was a bad GFCI, so i replaced and it still did not trip.

What could be going on?

Thanks.
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#163854 - 05/18/07 10:33 PM Re: two wire and GFCI [Re: Niko]
stamcon Offline
Member

Registered: 03/24/01
Posts: 322
Loc: So San Francisco CA
There's no "ground" for the current to "leak" to. If you used the test light from the GFCI protected hot, to the ground or grounded conductor of an extension cord, plugged into a grounded receptacle, the GFCI would trip.

steve

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#163859 - 05/19/07 06:12 AM Re: two wire and GFCI [Re: stamcon]
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
You've got to watch those 2 wire GFI's when they have a metal cover. I stuck a bugeye tester in one and pressed the test button and that energized the faceplate. The GFI passed the trip test as I completed the path to ground because I was touching the faceplate.

Keep in mind that a GFI receptacle is not a cure all for 2 wire replacements. 250-114 has a list of equipment that is required to be grounded and a GFI on a 2 wire circuit doesn't provide the required grounding.
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#163860 - 05/19/07 06:46 AM Re: two wire and GFCI [Re: Niko]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
Thanks for your input.
i realized what the problem of my test was.

Thanks.
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