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#179963 - 08/07/08 11:47 AM Low voltage lights under 30 volts
sparkync Offline
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Registered: 10/17/02
Posts: 812
Loc: NC
Sorry to be putting so many post. I guess it's my day in the shop and going over the code. One thing I wished they would have changed is 411.4(B). As far as I'm concerned and obviously a few of the inspectors I've had dealings with, the ruling for lights under 30 volts, to have to be
10 ft. away from a pool, is ridiculas. You can put a 120 volt light under the water. and within 5 ft., but you can't put a low voltage light within 10 ft. of the pool. I realize that the low voltage light is not grounded, but neither is it grounded when it is in the front or back yard after a hard rain and is accessible to children, elderly, etc. etc. It refers to article 680, but there is nothing I can find about low voltage lights in 680. I've had more than one pool where it was pratically impossible to keep that distance. I've had at least 2 inspectors that agreed with me. Anybody else had this problem. Seems like it just creats confusion, at least on my part it does...
Sorry for the ranting... guess it's just my day... Steve..
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#179977 - 08/07/08 04:35 PM Re: Low voltage lights under 30 volts [Re: sparkync]
EV607797 Offline
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Registered: 10/25/06
Posts: 744
Loc: Fredericksburg, VA, USA
You aren't being ridiculous, Steve. I agree that this is downright silly. Then again, I think that lots of '08 changes are crazy. It screams of how much influence that the manufacturers have over the code. I'll bet that if any manufacturers of LV lighting had a seat on the NEC's board, this wouldn't be an issue at all.
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#179987 - 08/07/08 10:49 PM Re: Low voltage lights under 30 volts [Re: EV607797]
gfretwell Online   content


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Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
If you had the same grounding and bonding requirement on a Malibu light as you have for an underwater light I am sure it would be safe.
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#181925 - 11/09/08 09:24 AM Re: Low voltage lights under 30 volts [Re: gfretwell]
harold endean Offline
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Registered: 02/16/02
Posts: 2233
Loc: Boonton, NJ
What does the manufacture instructions state? I have seen where the Manufactures instruction prohibits their lights within 10 feet of the pool. If that is the case, then they can't be there as per 110 of the NEC. Right? I am not saying that all manufactures do not allow their lights near the pool, just some of them.
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#181933 - 11/09/08 03:23 PM Re: Low voltage lights under 30 volts [Re: harold endean]
gfretwell Online   content


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Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
680 trumps 110.3(B). If it is not actually listed 680 safe I don't care what a manufacturer says on the label.
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#182020 - 11/16/08 06:09 AM Re: Low voltage lights under 30 volts [Re: gfretwell]
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
perhaps a gfi's efficy on the line side of the low v x-former is a consideration here?


Edited by sparky (11/16/08 06:09 AM)
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#182036 - 11/16/08 11:17 AM Re: Low voltage lights under 30 volts [Re: sparky]
gfretwell Online   content


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
A ground fault on the secondary of a LV lighting transformer will not trip a GFCI. In fact the "first fault" will not be seen at all. You will have just grounded what was an ungrounded source.
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#182048 - 11/16/08 03:22 PM Re: Low voltage lights under 30 volts [Re: gfretwell]
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
ok gfretwell, so would this justify the spacing difference?

~S~
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#182060 - 11/16/08 10:54 PM Re: Low voltage lights under 30 volts [Re: sparky]
gfretwell Online   content


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
Perhaps I didn't explain this clearly enough.
Low voltage lights are generally not GFCI protected, the primary protection will not protect for a fault on the secondary. If they did you could never keep those cheap Malibu lights burning. wink

I suppose if someone came out with a LV light that did have GFCI on the secondary side there would be a reason to reexamine this.
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Greg Fretwell
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#182061 - 11/16/08 11:45 PM Re: Low voltage lights under 30 volts [Re: gfretwell]
frenchelectrican Offline
Member
Registered: 02/06/03
Posts: 939
Loc: Wi/ Paris France { France for ...
That will be nice idea if someone get the GFCI work on secondary side of LV luminaires but IMO you will get more GFCI trips than it should be.

But what I heard but not confirmed and myself I did see that some of the LV transfomer some of them have secondary side is on isolated format.

Merci,Marc
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