GFCI Popping

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Spectrum pools

New User
Location
San Diego
Occupation
Pool contractor
I work on swimming pools. I found a 110v pool and Spa light combination without GFCI protection on it. Both lights work without a GFCI outlet. I Installed a ground fault circuit interrupter and it immediately popped.

The white neutral load wire from the GFCI goes to a junction box, pigtails the two light cords commons.

The hot line voltage goes to the Brass screw on the GFCI line Side and then a black wire comes from the load side of the GFCI brass screw over to the switch (one wire) on a double toggle switch.

a black wire comes off of each connection on the double toggle switch up to the junction box again and ties into each lamp cord.

I tried two different gfci, I've tried two different switches and even eliminated the double toggle switch entirely and the problem continues tripping.

I put a milliamp voltmeter between lamps ground wire and ground and saw nothing, I also used a floating stray voltage tester near the lamps inside the pool in the water. And saw nothing.

The only thing I can even guess is that maybe if there's another circuit tied into the incoming line voltage such as a garden light or an outlet that is faulty anybody have any opinions?

Thank you
 
It appears you know what you are doing but you really need to get an electrician in there. This sight is for electricians so we are not able to help.

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