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Old 11-25-2016, 02:10 PM   #1
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Question shore power

I was called in to troubleshoot nuisance tripping of the 30 amp shore power outlets at a marina. All of them have GFCI breakers in the circuit breaker box on shore. The breakers are square d series 2 GFCI units. Looking at excerpts from NEC 555.19 it is unclear whether the 30 amp outlets need GFCI protection. The panel where they are located is a subpanel with its own main breaker. 200 amps. Is there a GFCI breaker this size to put in the circuitry and replace the 30 amp units so as to prevent nuisance tripping. I also noticed in one article that long runs from the box to the receptacles can cause nuisance tripping.
While working on a boat electrical problem I noticed that an electric stove on the boat was causing nuisance tripping. ( The burners are themselves a ground fault )
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Old 11-25-2016, 05:07 PM   #2
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Have you really taken the time to trace out all the boat circuits to determine to 100% satisfaction that the tripping is not actually doing what it is supposed to ? (protecting people from getting shocked). There are a million boats with wiring problems out there.


How is a properly wired burner a ground fault ?
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Old 11-25-2016, 06:10 PM   #3
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Review 555.3, you could replace the main with a 100mA GFCI that but then your entire fleet could be dead because of one boats problem.

What makes you think it's nuisance tripping? As @wildleg asked, how much troubleshooting have you done to come to this conclusion?

You need to isolate and find the ground fault(s) that are causing the problem.

PS fix that stove
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Old 11-26-2016, 08:53 AM   #4
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FYI 555 changes in the '17 code and they lower the 100mA IIRC.
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Old 11-26-2016, 09:17 AM   #5
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The last marina I wired from scratch didn't require the 2pole 30s to have a GFI, just the 120 volt receptacles.
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Old 11-26-2016, 09:26 AM   #6
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Default shore power problems

Yes a lot of boats out there have electrical problems. The moisture and jury rigged wiring cause a lot of them. An electric stove burner has an internal heating element surrounded by a high temp insulator ( magnesium oxide I think ) that absorbs moisture when off. When it is first turned on this moisture forms a small ground fault to the sheath. Some GFCI breakers trip at a very low current into the ground circuit. 5 ma maybe less. I thought about changing the main breaker to a GFCI but you are right. One ground fault and the fleet goes down. Thanks for the input.
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Old 11-26-2016, 06:22 PM   #7
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Quote:
Originally Posted by Suncoast Power View Post
The last marina I wired from scratch didn't require the 2pole 30s to have a GFI, just the 120 volt receptacles.
It's kind of a poorly written article, but if you read 555.19 (A)and(B) it pretty much says just that as the OP stated.

But if you back up to 555.3, it says the main OCPD feeding the marina must have ground fault protection unless each branch circuit has it's own.

Having the main being the only ground fault for everything presents the obvious problem of one boat with an issue crashing the whole marina.
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Old 11-29-2016, 02:22 PM   #8
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There is no 200 A breaker that offers Class A (5 mA personnel protective) ground fault protection. The maximum breaker that offers Class A ground fault would be a 60 A if this is a QO, 2 wire load. If it is HOM or a load that includes a neutral, the maximum breaker size would be 50 A. Long runs can cause nuisance tripping due to inherent ground leakage in the wiring. We recommend a maximum of a 250 ft run. Anything longer than that can cause nuisance tripping frequently. As others have stated, electric stoves can commonly cause tripping issues on ground fault because the heating elements can frequently have ground leakage.
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Old 11-29-2016, 08:28 PM   #9
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How is this not locked?
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Old 11-30-2016, 12:08 AM   #10
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Quote:
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How is this not locked?
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