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Thread: What size ground wire for wet light niche

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    What size ground wire for wet light niche

    I am installing the lights on my pool. What size ground wire do I run to the inside of the light niche. Also can I hook up two 300 watt pool lights and 1- 100 watt spa light to one 20 amp gfi breaker?
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    Mod Squad jblizzle's Avatar
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    Re: What size ground wire for wet light niche

    Do you really mean ground wire or bonding wire?

    20 amps @ 120V is 2400 watts, so 700 watts should not be a problem.
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    Re: What size ground wire for wet light niche

    well my plumber ran the bare #8 bonding wire to the back of the niche. but I guess I have to run another wire to the inside of the niche. Is this a ground wire or bonding wire. Im assuming it is a ground wire that connects to the ground in my light junction box.
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    Mod Squad jblizzle's Avatar
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    Re: What size ground wire for wet light niche

    To be honest, I am not sure ... so hopefully someone more knowledgeable will come along.

    I think you only have to run the wire that is attached to the light fixture (which may include a ground in the bundle). Since it is bonded there is really nothing to "ground" in the niche.

    Sorry I can not be sure.
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    What size ground wire for wet light niche

    Code is no less than 8 awg coated green. This is in addition to the bare 8 on the outside of the niche. Google "mikeholt.com pool download". There is a great PDF on the 680 nec pool code that states this.
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    Mod Squad jblizzle's Avatar
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    Re: What size ground wire for wet light niche

    Quote Originally Posted by rhumbaclave
    Code is no less than 8 awg coated green. This is in addition to the bare 8 on the outside of the niche. Google "mikeholt.com pool download". There is a great PDF on the 680 nec pool code that states this.
    To me that reads that the 8 AWG is required if you use non-metallic conduit and it reads like that is the bonding wire ... but I am certainly no expert.
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    Re: What size ground wire for wet light niche

    As a general rule, the ground conductor should be the same size as the current-carrying conductors, and is typically determined by circuit current. For a 15 Amp circuit, one would use #14, w/ a #14 ground.

    Definitely do not confuse the electrical ground with the bonding of the equipotential grid.
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    What size ground wire for wet light niche

    Quote Originally Posted by jblauert
    Quote Originally Posted by rhumbaclave
    Code is no less than 8 awg coated green. This is in addition to the bare 8 on the outside of the niche. Google "mikeholt.com pool download". There is a great PDF on the 680 nec pool code that states this.
    To me that reads that the 8 AWG is required if you use non-metallic conduit and it reads like that is the bonding wire ... but I am certainly no expert.
    I stand corrected. It does seem to only be for non metallic. I
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    Re: What size ground wire for wet light niche

    Yeah I ran #8 green ground wire. Ill no tomorrow when my inspector comes out. I think I'll be okay. Thanks!
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    Mod Squad Bama Rambler's Avatar
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    Re: What size ground wire for wet light niche

    The code can be a bit confusing and you did the right thing because, after all else, it's the inspector that has the final say.
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    Re: What size ground wire for wet light niche

    just a quick reply, I passed inspection no problem. Yes you must run a #8 green ground wire to the inside of the niche and also waterproof the connection with potting compound. I though I would share since someone else may have the same question.
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