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Thread: Dual pool light GFCI tripping challenge

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    Jul 2013
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    El Cajon, CA
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    Dual pool light GFCI tripping challenge

    I am having problems with my pool Pentair Amerlight 500 watt pool lights. There are two of them wired as shown in the attached diagrams. The first shows the original wiring with separate 15 AMP circuit breaker connected to the LINE lugs of a Leviton 20 AMP GFCI outlet and the pool light circuit connected to the LOAD lugs. In December the North pool light failed and the GFCI would trip when either dimmer switch was brought to full. After reading the forms I replaced the North light with a new gasket, replaced the dimmer switches, checked all wiring connections and tried new GFCI outlets and dedicated GFCI 15 AMP circuit breakers. While detail is shown in the attached, the end result is that both lights will function normally when individually brought to full light, but will normally go only to 50% together until the GFCI trips on the GFCI Circuit breaker. Repeated attempts allows both lights to be brought to full intensity together, but several hour later they may initially be brought only to 50% again until the GFCI trips. Would appreciate any advice on where my problem could be.
    25K gal IG pebble tech salt water pool with Hayward DE filter, VSP, chlorine generator, polaris 280 pool sweep and solar heating. Built in 1978. City water.

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    Sacramento, CA
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    Re: Dual pool light GFCI tripping challenge

    Your diagram di not come through.

    What are the model and brand of dimmers
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: Dual pool light GFCI tripping challenge

    Have you tried removing the lights from the circuit and seeing if the same thing happens if you run both dimmers up at the same time?

    Or disconnect one light or the other and run both dimmers at the same time?

    Eliminate things one at a time and try to duplicate the condition.

    You could bring them to 100% separately...
    25K aggregate IG, Intellipro, FNS48, Polaris 360, PG2000 fiber optic light source

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    El Cajon, CA
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    Re: Dual pool light GFCI tripping challenge

    Hi,

    I uploaded the circuit diagram showing the dedicated GFCI Ckt Brkr now in the circuit plus pictures of the JBox and Elec Panel. Looks like my max storage now is 250KB down from 1 MB or so when I last posted so I'll try to post the test data summary later

    Anyway, the two new dimmers are Leviton LED/ Compact Fluorescent/Incandescent 6674P rated 150 W LED/CFL and 600 W Fluorescent. 120V/60Hz AC

    At this point each dimmer switch operates its light normally when independently on. With the North light on full setting the GFCI trips when the South light is at about 20%. When the South light is on full the GFCI trips when the North light is brought up to about 50%.

    Interestingly, if I leave the North light on either full or 50% for 15 minutes then bring it to full I can immediately bring the South light up rapidly to full without the GFCI tripping. At this point I can turn both lights on then bring both dimmers to 100% rapidly without tripping the GFCI. After the switches are off for 10 minutes however, the original behavior reasserts itself.

    When I started this process the original wiring for the lights was to the load points of a GFCI outlet. I added a dedicated 15 AMP GFCI circuit breaker to the panel for the two lights. All wiring nuts were removed and replaced to verify connections. The pool lights were removed from the pool wall, checked for leaks. The pool wall light housing ground bonding wire and pool light cable were checked for damage with negative result. As mentioned the dimmer switches were replaced with the new Leviton dimmers.

    Thoughts?
    Attached Files Attached Files
    25K gal IG pebble tech salt water pool with Hayward DE filter, VSP, chlorine generator, polaris 280 pool sweep and solar heating. Built in 1978. City water.

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    Re: Dual pool light GFCI tripping challenge

    What brand is the breaker? I'm thinking the GFCI just does not like your dimmer and when it's working the GFCI is seeing a differential and tripping.

    You may need to go back to a receptacle based GFCI or switch dimmers.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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