Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Cable from panel to light junction box

  1. Back To Top    #1

    Join Date
    Apr 2016
    Location
    South East USA
    Posts
    77

    Cable from panel to light junction box

    Hi,

    What type of cable should be run from the GFCI breaker at the pad-panel to the light junction box?

    The conduit is non-metalic and the path is above ground. The distance is about 10 feet.

    Thanks,

    ft.
    ~22,000 gallons, freeform, Pebbletec, beach entry AquaRite SWCG v1.33 Hayward Tristar SP325EE pump for main draw & skimmer Hayward sand filter S310S 1.5 hp booster pump Paramount PCC2000 in-floor cleaner, skimmer, debris containment canister Waterfall Pentair Intellibrite 5g LED light in Pentair stainless wet niche Jandy Lite2 heater: removed Auto-fill: deactivated

  2. Back To Top    #2


    TFP Guide

    Join Date
    Jul 2015
    Location
    Central Valley CA
    Posts
    1,073

    Re: Cable from panel to light junction box

    I would use stranded THWN if it is for LED lighting 14AWG should be more than enough. I don't think it is against code to use solid instead of stranded but I find stranded easier to work with.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

  3. Back To Top    #3

    Join Date
    Apr 2016
    Location
    South East USA
    Posts
    77

    Re: Cable from panel to light junction box

    Many thanks. Is THHN required for code?

    Can solid romex cable labelled "indoor" be used since it's enclosed in conduit on a short run? The guy at Lowes said it would be fine. I listened to him but am having second thoughts & I'd like to double check.

    If not what should I ask for?

    Many thanks,

    ft.
    ~22,000 gallons, freeform, Pebbletec, beach entry AquaRite SWCG v1.33 Hayward Tristar SP325EE pump for main draw & skimmer Hayward sand filter S310S 1.5 hp booster pump Paramount PCC2000 in-floor cleaner, skimmer, debris containment canister Waterfall Pentair Intellibrite 5g LED light in Pentair stainless wet niche Jandy Lite2 heater: removed Auto-fill: deactivated

  4. Back To Top    #4

    TFP Guide

    Join Date
    Jun 2012
    Location
    western NY
    Posts
    1,557

    Re: Cable from panel to light junction box

    What amp rating is on the breaker? This will determine the size wire to use. 12 guage or 14 gage for 15 amp and 12 guage only for 20 amp. make sure you buy THWN white and black for the feeds and insulated green for the ground. NM romex is not rated for wet locations and ALL conduit outdoors is recognized by the NEC as a wet location. Type UF romex is also against code as the ground wire is not insulated. (the UF romex jacket is not rated as an insulator).
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

  5. Back To Top    #5

    Join Date
    Apr 2013
    Location
    Sacramento, CA
    Posts
    2,769

    Re: Cable from panel to light junction box

    As danpik states its not ok to use Romex in any pool application. Generally Romex is prohibited inside conduit.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

  6. Back To Top    #6

    Join Date
    Apr 2016
    Location
    South East USA
    Posts
    77

    Re: Cable from panel to light junction box

    So I went back to Lowes... again.

    They do not carry THWN, only THHN.

    But the guys in Lowes could not believe I wanted to switch from romex in the conduit.

    The city building inspector/fire inspector was actually in the store (this is a small town) and they brought him over to talk about it.

    He said he would not fail anyone for using romex in conduit over a short distance in such a case; this is what he would have used himself.

    He said to use THHN if it would help me sleep better, but THWN was really not worth it. In any case, Lowes could only special-order THWN if I bought a 500ft spool.

    I bought THHN for the 10 feet that will be in conduit, and I will switch from the romex in due course.

    YMMV, but many thanks for the guidance above.

    ft.
    ~22,000 gallons, freeform, Pebbletec, beach entry AquaRite SWCG v1.33 Hayward Tristar SP325EE pump for main draw & skimmer Hayward sand filter S310S 1.5 hp booster pump Paramount PCC2000 in-floor cleaner, skimmer, debris containment canister Waterfall Pentair Intellibrite 5g LED light in Pentair stainless wet niche Jandy Lite2 heater: removed Auto-fill: deactivated

  7. Back To Top    #7

    Join Date
    Apr 2013
    Location
    Sacramento, CA
    Posts
    2,769

    Re: Cable from panel to light junction box

    Now thats a great story!!! Good compromise. The insulated ground wire is important in a pool application. Its often overlooked but it exists for a reason.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

  8. Back To Top    #8

    TFP Guide

    Join Date
    Jun 2012
    Location
    western NY
    Posts
    1,557

    Re: Cable from panel to light junction box

    THHN stands for "Thermoplastic High Heat Resistant Nylon Coated". The W is for wet location. There are a lot of manufacturers making dual rated THHN THWN wire now. It is usually marked as such. While NM, UF, etc (Romex is a brand name) can be sleeved in conduit for protection, it is not rated to be used there due to the heat rating of the wire. If it is used in conduit, it may have to be de-rated. However, NM cable is not rated for wet applications as UF cable is. Most wire inside a NM jacket is THHN wire. However, you can not remove the jacket and maintain the UL listing for the wire as the wires inside the jacket do not have any labeling on them. I am a bit surprised to the inspectors comment but, seeing he is not an electrical inspector familiar with pool wiring safety,not too surprised. Not following the codes in some cases does not pose too much of a threat to human safety. Not following the codes with pools is not something I am not comfortable with
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •