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#177750 - 05/11/08 08:55 AM A puzzel for Henry C
Alan Nadon Offline
Member
Registered: 03/10/05
Posts: 399
Loc: Elkhart, IN. USA
Since many enjoyed the puzzle Henry posted the other day I thought I would add one that had me stumped.
A few years ago (NEC 1999) a contractor called me to check out a problem with a new inground swimming pool.
The problem was that the GFI receptacle kept tripping.
He then went to the sub panel and showed me that the breaker for the receptacle was in the OFF position. We then reset the receptacle and it tripped, with the breaker off.
What do you think was causing it ?
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#177751 - 05/11/08 09:14 AM Re: A puzzel for Henry C [Re: Alan Nadon]
sparkyinak Offline
Member
Registered: 07/08/07
Posts: 1307
Loc: Alaska
Since it was in the 'off' positon and not the 'tripped' position, I'd say the breaker was defective
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#177754 - 05/11/08 09:27 AM Re: A puzzel for Henry C [Re: Alan Nadon]
HCE727 Offline
Member
Registered: 11/11/05
Posts: 186
Loc: Delaware County, PA, USA
Where was the sub-panel located, inside or out?
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#177758 - 05/11/08 10:20 AM Re: A puzzel for Henry C [Re: HCE727]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
Shared neutral.
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#177768 - 05/11/08 05:55 PM Re: A puzzel for Henry C [Re: gfretwell]
harold endean Offline
Member
Registered: 02/16/02
Posts: 2233
Loc: Boonton, NJ
My 2 cents on this puzzle.
If the breaker was OFF and the GFI receptacle had power but tripped the test/trip buttons on the receptacle, then the breaker must be defective.

If the breaker was OFF and you couldn't rest the test/trip buttons on the GFI receptacle, maybe you needed power in order to reset the buttons on the receptacle.
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#177771 - 05/11/08 06:07 PM Re: A puzzel for Henry C [Re: harold endean]
twh Offline
Member
Registered: 03/11/04
Posts: 901
Loc: Regina, Sask.
It must be interesting or it wouldn't be posted here. I'll guess hot and neutral reversed.
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#177778 - 05/11/08 08:41 PM Re: A puzzel for Henry C [Re: twh]
EV607797 Offline
Member
Registered: 10/25/06
Posts: 744
Loc: Fredericksburg, VA, USA
My guess is that the load side of the GFI receptacle is being backfed from another circuit.
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"But the guy at Home Depot said it would work."
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#177786 - 05/12/08 03:36 AM Re: A puzzel for Henry C [Re: EV607797]
SteveFehr Offline
Member
Registered: 03/19/05
Posts: 1195
Loc: Chesapeake, VA
It was tripping from current through the neutral and a neutral-ground fault.
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#177795 - 05/12/08 08:16 AM Re: A puzzel for Henry C [Re: SteveFehr]
Alan Nadon Offline
Member
Registered: 03/10/05
Posts: 399
Loc: Elkhart, IN. USA
Breaker was in a sub panel located indoors near the pool.
The breaker was in the OFF position, not tripped.
When the reset was pushed ON the receptacle it would quickly trip.
The receptacle was on a dedicated circuit, no shared neutral.
Additional Information.
Thinking that the breaker was defective the black wire to the breaker was disconnected.
The GFI receptacle was reset*, and then tripped !
*Older GFIs could be reset with the power OFF.
Alan Nadon
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Alan--
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#177799 - 05/12/08 09:34 AM Re: A puzzel for Henry C [Re: Alan Nadon]
venture Offline
Member
Registered: 01/08/06
Posts: 38
Loc: San Diego Ca USA
Panel connections wrong/bad? Rod
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