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Detached Building #93168
05/05/05 11:16 PM
05/05/05 11:16 PM
G
George Little  Offline OP
Member
Joined: Jan 2004
Posts: 1,493
Michigan USA
If I want to run 2 circuits to a detached building in the residential setting, do I have to install a sub panel? I say you do???


George Little
2017 / 2014 NEC & Related Books and Study Guides
Re: Detached Building #93169
05/05/05 11:28 PM
05/05/05 11:28 PM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,337
Estero,Fl,usa
You can run a single multiwire feeding 2 120v legs but not 2 separate circuits ... the way I see it.


Greg Fretwell
Re: Detached Building #93170
05/06/05 07:26 AM
05/06/05 07:26 AM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
Wouldn't 225.36 Exception Apply.

Re: Detached Building #93171
05/06/05 06:36 PM
05/06/05 06:36 PM
G
George Little  Offline OP
Member
Joined: Jan 2004
Posts: 1,493
Michigan USA
Ernie- 225.30 limit's you to one supply with additional supplies for special conditions and residential homes can't qualify for any of these special conditions. So at best we could run a multiwire branch circuit and call it one circuit like Greg says. And I agree.


George Little
Re: Detached Building #93172
05/07/05 12:29 AM
05/07/05 12:29 AM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,337
Estero,Fl,usa
I think the real intent is that all remote buildings get a panel, ground etc like an "HO guage service" but they make an exception for the guy who just wants a light and a receptacle in his shed. It probably makes a few less orange cords strung through the trees.


Greg Fretwell
Re: Detached Building #93173
05/07/05 12:32 AM
05/07/05 12:32 AM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,337
Estero,Fl,usa
Now the obligatory "gee whiz" question.
If the feeder is #10/3wg with a 30a sub panel, what size wire do you run to the ground rod?


Greg Fretwell
Re: Detached Building #93174
05/07/05 10:06 AM
05/07/05 10:06 AM
G
George Little  Offline OP
Member
Joined: Jan 2004
Posts: 1,493
Michigan USA
And the "obligatory" answer is minimum #8 cu.
I liked that word"obligatory" so I thought I'd use it in the answer, must be the inspector in me. Could use #6 AL if you could figure out some way to keep it 18" above the earth.


George Little
Re: Detached Building #93175
05/07/05 12:03 PM
05/07/05 12:03 PM
E
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
MA, USA
Do you think Table 250.66 note 2 might allow you to use a #10 here ? Using the argument that the feeders to the subpanel are not Service Entrance Conductors and thus the "equivalent" size service entrance conductors to feed the load would be (is, in fact) #10.

Re: Detached Building #93176
05/07/05 12:23 PM
05/07/05 12:23 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
How about if I connect the two structures with a fence?


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Detached Building #93177
05/07/05 12:31 PM
05/07/05 12:31 PM
E
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
MA, USA
I don't think the fence can make a difference. If joining 2 structures with a fence creates a single structure than I live in my neighbors house. Or does he live in mine [Linked Image]

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