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#93585 - 06/01/05 09:44 PM Multiwire Branch Circuit  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Can I run a multiwire branch circuit to a garage consisting of a #14 and a #12 ungrounded conductor and a # 12 grounded conductor?


George Little

2017 / 2014 NEC & Related Books and Study Guides

#93586 - 06/02/05 12:01 AM Re: Multiwire Branch Circuit  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
Sometimes multi wire circuits are run in mixed wire/breaker sizes around here. One example would be a bathroom. The #14 for lighting and #12 for GFI. Myself I try to keep equipment off of lighting. I'm sure some would not like this multi wire set-up. Maybe someone could figure the math on this with extreme conditions. I doubt it would make much differance doing it this way. Never had a complaint or seen a problem. I try to tape the network together and put the breakers next to each other to avoid confusion for someone elce but thats just my thing.

Tom


#93587 - 06/02/05 12:37 AM Re: Multiwire Branch Circuit  
Gregtaylor  Offline
Member
Joined: Mar 2005
Posts: 212
Boise, Idaho, USA
Active, are you talking about NM? Where does one get such stuff?


#93588 - 06/02/05 12:39 AM Re: Multiwire Branch Circuit  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Don't see why not... At least if neutral is not the #14.

Is this a seperate building?


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

#93589 - 06/02/05 02:00 AM Re: Multiwire Branch Circuit  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
Not NM. I'm allways talking pipe. Don't see much MN except code corections or some use it for UF. If I had to do a whole building with MN I would look like a Moe because not much experiance with it.

Tom


#93590 - 06/02/05 05:48 AM Re: Multiwire Branch Circuit  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I have run a mixed size multiwire circuit before. I see no problem with it.

We remodeled a small kitchen in a office building. They had a removed a stove fed with 6/3 AC cable.

I used one side of the 6/3 to feed a 30 amp 120 volt water heater and the other side to feed 120 volt 20 amp outlets.

No worries about voltage drop. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#93591 - 06/02/05 10:12 PM Re: Multiwire Branch Circuit  
Electricmanscott  Offline
Member
Joined: Jan 2002
Posts: 1,457
Holden, MA USA
You certainly can do this. Wait. Is this a trick question? Define garage. [Linked Image]

[This message has been edited by Electricmanscott (edited 06-02-2005).]


#93592 - 06/02/05 10:43 PM Re: Multiwire Branch Circuit  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
No trick question. Just never did that trick before. Can't see any hazard and the reason he wanted to do it was so he can put the plugs on a 20a. circuit and the lights on a 15a. circuit. I couldn't find anything in the code that prohibited it. Thought you code aficionados knew of an article in the book that would apply. As for the definition of garage:

GARAGE
n 1: an outbuilding (or part of a building) for housing automobiles 2: a repair shop where cars and trucks are serviced and repaired [syn: service department] v : keep or store in a garage; "we don't garage our car"

Source: WordNet ® 2.0, © 2003 Princeton University




[This message has been edited by George Little (edited 06-02-2005).]


George Little

#93593 - 06/02/05 10:47 PM Re: Multiwire Branch Circuit  
HLCbuild  Offline
Member
Joined: Dec 2004
Posts: 209
Herndon,Va USA
George,
Can we assume that this is an "attached" garage?


#93594 - 06/02/05 10:49 PM Re: Multiwire Branch Circuit  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Detached Garage - I forgot to mention that.


George Little

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