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Thread: pool light tripping GFCI

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    pool light tripping GFCI

    My pool light trips the GFCI on the panel. The switch inside the house is connected to the output of a GFCI receptacle on the pool electrical panel. Does any one know how to figure out what's going wrong?

    120V breaker hot -----> |GFCI | --->switch------> pool bulb live
    120V neutral ---------> |outlet |-----------------> pool bulb neutral
    GROUND -------------->|----------|>----------------->pool bulb ground
    In the pool business and finally succumbed to building a pool....

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    Mod Squad JohnT's Avatar
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    Re: pool light tripping GFCI

    Is this a newinstall, or has it worked in the past and just started tripping?
    TFP Moderator
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    Re: pool light tripping GFCI

    Not a new install but I have been refurbishing the panel. I replaced the GFCI and other pool equipment.
    In the pool business and finally succumbed to building a pool....

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    JasonLion's Avatar
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    Re: pool light tripping GFCI

    Water inside the light fixture is one common cause. Water in the junction box near the pool can also do it. Defective GFCI outlets are also common.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: pool light tripping GFCI

    water in light fixture --- I dont know. I cant get the light fixture off yet.
    water in junction box --- Nope.
    Defective GFCI --- not sure but the outlet works.
    In the pool business and finally succumbed to building a pool....

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    Re: pool light tripping GFCI

    Quote Originally Posted by JasonLion
    Water inside the light fixture is one common cause.
    My pool builder went through three Hayward light fixtures to find one that didn't leak. He told me the other day that he had another one leak at a new install.

    ETA: The first time they were trouble shooting the issue they connected the wiring to an extension cord and plugged it in to a different circuit. It blew that circuit as well.
    34K gal IG, 37'x40' lagoon, vinyl, Pentair IntelliFlo VS Pump, 500# Hayward sand filter, Jandy SWG, Raypac heat pump, 4 deck jets, Hayward Super Pump + deck fountain, Dolphin Oasis Z5

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    Re: pool light tripping GFCI

    I guess I have to figure out how to remove the light fixture from the niche. The screw will not budge. Any idea how to get it off while under water?
    In the pool business and finally succumbed to building a pool....

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    Mod Squad jblizzle's Avatar
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    Re: pool light tripping GFCI

    I want to verify you have the GFCI wired correctly It should be:

    120V breaker hot -----> |GFCI Line| ; |GFCI Load| --->switch------> pool bulb live
    120V neutral ---------> |GFCI Line| ; |GFCI Load| -----------------> pool bulb neutral
    GROUND -------------->|----------|>----------------->pool bulb ground

    The neutral has to pass through the GFCI outlet as well as the hot.
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    Re: pool light tripping GFCI

    Quote Originally Posted by jblizzle
    I want to verify you have the GFCI wired correctly It should be:

    120V breaker hot -----> |GFCI Line| ; |GFCI Load| --->switch------> pool bulb live
    120V neutral ---------> |GFCI Line| ; |GFCI Load| -----------------> pool bulb neutral
    GROUND -------------->|----------|>----------------->pool bulb ground

    The neutral has to pass through the GFCI outlet as well as the hot.
    Yes, I think it is. The connection at the top of the GFCI, normally covered with a red sticker.
    In the pool business and finally succumbed to building a pool....

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