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Old 08-11-2010, 09:20 AM   #16
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GFCI Breaker Tripping Spa Light


Also remember you said with the fixture removed the gfci breaker doesn't trip. but if you touch the fixture metal to the water it trips instantly. Also remember that you said with the hot wire disconnected at the jb and the neutral only connected the gfci trips.

If that is the case where is the leakage current coming from showing up on the neutral if the power for the light isn't present at the fixture? It seems you have a couple problems neutral and ground faulted at the fixture and a current source from another circuit or energized water.

I'd be careful till you locate the source of this fault.

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Old 08-12-2010, 08:18 PM   #17
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Well you have found your problem. Both tests should read open (infinite).
I communicated with tech support at Pentair. They said the neutral to ground resistance on the fixture should be 0.4 to 0.5 ohms, not infinite. The new fisture we have measures 0.4 to 0.5 just as they said so that seems correct.
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Old 08-12-2010, 10:04 PM   #18
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I communicated with tech support at Pentair. They said the neutral to ground resistance on the fixture should be 0.4 to 0.5 ohms, not infinite. The new fisture we have measures 0.4 to 0.5 just as they said so that seems correct.
This does not make sense. At all. Why would there be any continuity between neutral and ground at the fixture? That's both a code violation (if the internal fixture wiring were subject to the NEC) and a functional problem, unless I'm missing something here. It's a code violation because neutral and ground are not permitted to be bonded anywhere except at the panel, and because this intentionally places current on the grounding conductor. It's a functional problem because it will randomly trip GFCIs, and the light is required to be on a GFCI! What is the reason for there being any connection between neutral and ground at the light? I assume there's some type of active electronic device in there that creates this phenomenon, but I don't know what it is or why it "has" to be designed the way it apparently is.
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Old 08-12-2010, 10:21 PM   #19
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GFCI Breaker Tripping Spa Light


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I communicated with tech support at Pentair. They said the neutral to ground resistance on the fixture should be 0.4 to 0.5 ohms, not infinite. The new fisture we have measures 0.4 to 0.5 just as they said so that seems correct.
If that is the case then your gfci will never reset. If neutral and ground show continuity then some current will always leak to the ground when the light is turned on. This will show up as an imbalance between hot and neutral at the gfci breaker ... assuming the load neutral is connected to the gfci and the white pigtail is connected to the neutral bar.

You said however that with the hot wire disconnected and the neutral connected the gfci tripped.

Anyway at this point I'm just not following what you have going on. You have a fixture that when not installed in the niche is just fine. When you install it and as soon as the water touches the fixture metal the gfci trips. And I am assuming it trips with the hot disconnected at the jbox and the neutral still connected. This points to an alternate source of current ... that current travels on the metal of the fixture (bonded to ground) to the the neutral. That current then travels to the gfci where it sees current on the neutral but no current on the hot wire and immediately trips.

Now .. you said that if you take the fixture out if the niche and connect all the wires correctly the gfci holds. If the neutral and ground have continuity between them as tech support says (which I doubt is correct) the minute you turn the light on the gfci will trip. The only way it would not trip is if the equipment ground back to the panel is open somewhere.
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Old 08-12-2010, 10:28 PM   #20
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GFCI Breaker Tripping Spa Light


If you did open up the wet niche luminaire and double check the netural and ground conductor to make sure they are not bonded at that location that is very circital due it will trip the RCD {GFCI } no question asked.

Ask the manufacter to send you a other verison of wet niche luminaire to see if that slove the issue and I know I have ran into few wet niches luminaire the overheat sensor always on the hot conductor side never at netural at all.{ a simple thermal switch }

I just never understand why that manufacter stated to almost have both netural and ground be on that spot IMO that is the major issue there if you read the NEC code very clear on this matter.

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Old 09-08-2010, 10:42 AM   #21
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Here's an update on this. Pentair sent a replacement fixture and it works properly. The breaker does not trip.

Bottom line was that the original fixture was slightly leaking water and therefore creating a current path to ground tripping the breaker. The new fixture we purchased had defective electronics in the overload circuitry causing it also to trip the breaker. The replacement fixture from Pentair replacing the new one under warranty worked properly.
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Old 09-08-2010, 09:57 PM   #22
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Thanks for letting us know the update infomation what is going on and if you have more issue or question just holler in here one of us will help ya.

Merci.
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