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#90887 - 12/17/04 05:13 AM Underwater Pool Light Grounding
mustangelectric Offline
Member
Registered: 02/08/04
Posts: 494
Loc: Bentonville, AR
Hi,
I was looking at the NEC for grounding of underwater pool lights and it says that I need an EGC no smaller than #12, is this correct?

Is this fronm the lights to the switch or to the panel?

Thanks for any replies.

-regards

Greg
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#90888 - 12/17/04 09:38 AM Re: Underwater Pool Light Grounding
shortcircuit Offline
Member
Registered: 06/27/04
Posts: 608
Loc: massachusetts
The #12 insulated grd should be run from the panel to the pool light juction box or listed transformer...and installed in pipe.

A #8 grd wire from the juction box to the forming shell...

OK?

shortcircuit
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#90889 - 12/19/04 08:17 AM Re: Underwater Pool Light Grounding
ZR600 Offline
Member
Registered: 04/02/02
Posts: 46
Loc: Stevens Point, WI, USA
Must be a solid #8 to the shell.
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#90890 - 12/19/04 08:22 AM Re: Underwater Pool Light Grounding
PCBelarge Offline
Member
Registered: 06/08/03
Posts: 681
Loc: Dobbs Ferry, NY, USA
Bonding the forming shell and grounding the pool light are two different issues, both items are addressed in Art 680.

Pierre
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#90891 - 12/19/04 07:43 PM Re: Underwater Pool Light Grounding
mustangelectric Offline
Member
Registered: 02/08/04
Posts: 494
Loc: Bentonville, AR
Hi,
The feed is #14 the EGC is #14...The code says #12 for the EGC not the ungrounded or grounded condcutor..

The pool guy is doing this work..

just making sure...

-regards

Greg
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#90892 - 12/20/04 12:38 PM Re: Underwater Pool Light Grounding
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
You need an unspliced #12 from the j box back to the panel
680.23(F)(2)Through-wall lighting assemblies, wet-niche, dry-niche, or no-niche luminaires (lighting fixtures) shall be connected to an insulated copper equipment grounding conductor installed with the circuit conductors. The equipment grounding conductor shall be installed without joint or splice except as permitted in (a)<anpther listed light j box> and (b)<grounding terminals in a switch box that controls the light>. The equipment grounding conductor shall be sized in accordance with Table 250.122 but shall not be smaller than 12 AWG.

He can't splice in a receptacle box or any other box that isn't for switching the light!

As for the ground to the forming shell <in addition to the EGC in the cord> it is either a brass conduit or plastic. If plastic 680.23(B)(2)(b)Nonmetallic Conduit. Where a nonmetallic conduit is used, an 8 AWG insulated solid or stranded copper equipment grounding conductor shall be installed in this conduit unless a listed low-voltage lighting system not requiring grounding is used. The equipment grounding conductor shall be terminated in the forming shell, junction box or transformer enclosure, or ground-fault circuit-interrupter enclosure. The termination of the 8 AWG equipment grounding conductor in the forming shell shall be covered with, or encapsulated in, a listed potting compound to protect the connection from the possible deteriorating effect of pool water.

Note that can be stranded, the ONLY place I know of that specifically allows stranded #8, although some people attempt to make the argument #8 stranded is "larger" than #8 solid thus OK.
I point to 680.26(C) which is pretty unambiguous "(C) Common Bonding Grid. The parts specified in 680.26(B) shall be connected to a common bonding grid with a solid copper conductor, insulated, covered, or bare, not smaller than 8 AWG."
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