ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/24/17 12:05 PM
75 kva tranformer
by sparkync. 09/23/17 06:41 PM
Another generator question
by gfretwell. 09/23/17 04:15 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,956 Are you busy
176,756 Re: Forum
168,602 Need opinion
Who's Online Now
0 registered members (), 73 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#88761 - 07/21/04 08:46 PM Downstream GFCI protection  
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
MA, USA
Is there a limit on the number of receptacles that can be protected downstream of each GFCI receptacle?


2017 / 2014 NEC & Related Books and Study Guides

#88762 - 07/21/04 09:01 PM Re: Downstream GFCI protection  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
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.


#88763 - 07/21/04 09:21 PM Re: Downstream GFCI protection  
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
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.


#88764 - 07/21/04 09:45 PM Re: Downstream GFCI protection  
stamcon  Offline
Member
Joined: Mar 2001
Posts: 329
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


#88765 - 07/22/04 07:08 PM Re: Downstream GFCI protection  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
One must check the destructions...
Some are 4, some are 5.

Oyr local code is 5!


Mark Heller
"Well - I oughta....." -Jackie Gleason

#88766 - 07/22/04 09:14 PM Re: Downstream GFCI protection  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,118
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.


Greg Fretwell

#88767 - 07/22/04 11:24 PM Re: Downstream GFCI protection  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,261
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. ??


#88768 - 07/23/04 04:29 AM Re: Downstream GFCI protection  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
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_isap...nfran.nfo&softpage=browse_frame_pg42


Mark Heller
"Well - I oughta....." -Jackie Gleason

#88769 - 07/24/04 06:22 PM Re: Downstream GFCI protection  
trekkie76  Offline
Member
Joined: Jun 2004
Posts: 220
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.



Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.019s Queries: 14 (0.003s) Memory: 0.8008 MB (Peak: 0.9708 MB) Zlib enabled. Server Time: 2017-09-26 16:22:18 UTC