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#93168 - 05/06/05 12:16 AM Detached Building  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
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

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#93169 - 05/06/05 12:28 AM Re: Detached Building  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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

#93170 - 05/06/05 08:26 AM Re: Detached Building  
Yoopersup  Offline
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Joined: Mar 2003
Posts: 822
Michigan
Wouldn't 225.36 Exception Apply.


#93171 - 05/06/05 07:36 PM Re: Detached Building  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
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

#93172 - 05/07/05 01:29 AM Re: Detached Building  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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

#93173 - 05/07/05 01:32 AM Re: Detached Building  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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

#93174 - 05/07/05 11:06 AM Re: Detached Building  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
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

#93175 - 05/07/05 01:03 PM Re: Detached Building  
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.


#93176 - 05/07/05 01:23 PM Re: Detached Building  
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

#93177 - 05/07/05 01:31 PM Re: Detached Building  
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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