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GFI on a 3-way ciruit ??

Posted by Greg on May 29th, 2001 10:08 PM

I have a brick house (built in '65) with NO outdoor outlets, so of course, the wifes up and buys an outdoor fountain (looks pretty, she says {does, but I digress})
S'anyway, it's of course my job to figure out how to get power to this thing, and I thought I did a pretty good job, 'cept I get an open ground reading on my tester.
Here's what I did: 1) I got access to the carport light circuit (which involved adding attic stairs, etc. but that's another tale) and found the outer wall junction box [the ONLY electrical service outside the house]
2) I added a GFI circuit for the fountain and a separate outside switch for the carport light [2 individual runs from the same junction containing a white, black and ground]
3) I should point out here that the carport light is on a 3-way circuit.
4) When I test the circuit it comes up indicating open ground.
In theory, since it's on a 3-way circuit, I should have two grounds (inside the house) Is this a false reading that's really indicating a neutral problem related to the 3-way circuit?
5) The light works, and yes I used UF cable buried 18" to the GFI. What did I do wrong?

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