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kyle11 10-03-2012 11:18 PM

Gfcb question.
I just ran uf-b direct burial wire to 2 light poles 10 feet from our pool. They worked fine on a regular breaker. It has rained probably 4 inches the past few days. Now I connected it to a 15amp gfcb ,just for extra protection considering it is so close to water, that only has the pool light on it which pulls 50 watts. Gfcb trips instantly when the 2 pole lights are connected. Does not trip when only pool light is connected. It is connected to a aqua logic sub panel with built in relay timers. Is it possible I already have a problem in the wire? I didn't use conduit except coming out if the concrete where the pole lights are mounted and up to the sub panel. I sealed the light poles with silicone but could moisture have gotten inside the pole? Just want to know what's the 1st logical thing to try 1st to trouble shoot this problem.

mpoulton 10-04-2012 01:12 AM

Well, you definitely have an actual ground fault. It's a real problem that needs to be solved. I would start by checking all the connection locations for any indication of a ground fault, or a neutral-ground connection. You could connect it to the non-GFCI breaker again temporarily and (carefully) check for voltage on metal parts and use a clamp-on meter to measure current in the grounding conductors. That should help isolate the problem.

Julius793 10-04-2012 07:37 AM

Call a pro, once you start with contactors and stuff and mix neutrals or many other common mix ups the gfi's don't work.

kyle11 10-04-2012 10:41 PM

Found the problem. When I wired it to the gfcb I didn't put the 14/2 neutral to the breaker I left it on the neutral bar as it was hooked to a regular breaker before. Wired it to the breaker and worked like a charm. Thanks for your replies.

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