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#88761 - 07/21/04 05:46 PM Downstream GFCI protection
Electric Ian Offline
Member
Registered: 02/10/04
Posts: 133
Loc: MA, USA
Is there a limit on the number of receptacles that can be protected downstream of each GFCI receptacle?
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#88762 - 07/21/04 06:01 PM Re: Downstream GFCI protection
shortcircuit Offline
Member
Registered: 06/27/04
Posts: 608
Loc: massachusetts
Well in commercial work you are restricted to the number of outlets that can be installed on a 15 or 20 amp branch circuit, each outlet counts as 180 voltamps. In residential there is no limit except for the 3 watts per square foot. Each branch circuit should be of sufficient size to carry the load to be served.
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#88763 - 07/21/04 06:21 PM Re: Downstream GFCI protection
Electric Ian Offline
Member
Registered: 02/10/04
Posts: 133
Loc: MA, USA
Yes, that's my understanding but a friend of mine got a "homeowners wiring guide" from the big orange house and he showed me a passage stating that a GFCI receptacle can only protect 4 additional downstream receptacles. I never heard this before and was just wondering if there was a code requirement I missed somewhere along the way.
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#88764 - 07/21/04 06:45 PM Re: Downstream GFCI protection
stamcon Offline
Member
Registered: 03/24/01
Posts: 329
Loc: So San Francisco CA
(Residential)It's not a code issue, other than if it's in the manufacturer's instructions. I use to think there was a limit of 6 downstream receptacles, but the NEC doesn't state this nor have I found anything in any GFI manufacturer's instructions limiting the downstream number.

steve
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#88765 - 07/22/04 04:08 PM Re: Downstream GFCI protection
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
One must check the destructions...
Some are 4, some are 5.

Oyr local code is 5!
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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#88766 - 07/22/04 06:14 PM Re: Downstream GFCI protection
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
I can't imagine what the justification could possibly be for a limit on the number of downstream receptacles. In the commercial world you have a restriction on the total number on a branch circuit (the 180va deal) but that doesn't address whether they are upstream or downstream of a GFCI. Beyond that it only depends on the feedthrough ampacity of the GFCI. You can exceed that with one duplex as easily as 10. (2 hair dryers or toasters?)
The only other thing I can possibly think of is the "antenna effect" of a long conductor (false trips) but again, that can just be one receptacle way out in the yard.
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Greg Fretwell
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#88767 - 07/22/04 08:24 PM Re: Downstream GFCI protection
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
e57,

How can that be a local code? Amendments like that aren't supposed to be allowed to the CEC by municipalities. ??
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#88768 - 07/23/04 01:29 AM Re: Downstream GFCI protection
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
electure,
can't find it now... They may have pulled it?

Although they still ask, "No More than five?" - "Yep, no more than five" (On feed thrus) I was asked that two weeks ago.

SF did have to go to court over some of thier wackier codes, that went far beyond the rest of the state. After you check the NEC, you have to go check here to see what they might have added or changed.
http://gcp.esub.net/cgi-bin/om_isapi.dll...owse_frame_pg42
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason
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#88769 - 07/24/04 03:22 PM Re: Downstream GFCI protection
trekkie76 Offline
Member
Registered: 06/19/04
Posts: 220
Loc: baileyville, maine, usa
I have always found that 5 was the magic number for D.S. anymore than that and I had a lot of nuisance tripping.
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