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Detached Building #93168 05/05/05 11:16 PM
Joined: Jan 2004
Posts: 1,507
G
George Little Offline OP
Member
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
Joined: Jul 2004
Posts: 9,546
G
gfretwell Offline
Member
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
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline
Member
Wouldn't 225.36 Exception Apply.

Re: Detached Building #93171 05/06/05 06:36 PM
Joined: Jan 2004
Posts: 1,507
G
George Little Offline OP
Member
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
Joined: Jul 2004
Posts: 9,546
G
gfretwell Offline
Member
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
Joined: Jul 2004
Posts: 9,546
G
gfretwell Offline
Member
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
Joined: Jan 2004
Posts: 1,507
G
George Little Offline OP
Member
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
Joined: Feb 2004
Posts: 133
E
Electric Ian Offline
Member
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
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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
Joined: Feb 2004
Posts: 133
E
Electric Ian Offline
Member
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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