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Joined: Aug 2004
Posts: 69
nov Offline OP
Are two circuit the max that I can get to a detached garage with out putting a sub panel in. I thought you can run a 12/3 and share the neutral to give you the two circuits is this correct.

2017 / 2014 NEC & Related Books and Study Guides
Joined: Nov 2000
Posts: 2,148
I thought you can run a 12/3 and share the neutral to give you the two circuits is this correct.
That is a single circuit...a multiwire circuit.
225.30 Number of Supplies
Where more than one building or other structure is on the same property and under single management, each additional building or other structure that is served by a branch circuit or feeder on the load side of the service disconnecting means shall be supplied by only one feeder or branch circuit unless permitted in 225.30(A) through (E). For the purpose of this section, a multiwire branch circuit shall be considered a single circuit.

Joined: Jan 2004
Posts: 1,507
This is an excellent question and I've had to deal with it before. Someone wanted to run a multiwire branch circuit as Don discribed, for lights and plugs. In addition he wanted to run a circuit for a welder. I told him he needed to have a sub-panel and he had a fit. He ultimately put in a sub-panel but he was not happy. The multiwire branch circuit was one circuit but adding the welder was the second circuit.

George Little
Joined: Jul 2004
Posts: 9,663
Likes: 4
If the welder was using L/L on the same 15/20a MW circuit I would probably question the decision. If you are saying he ran a MW plus a welder circuit I agree 100%. With few exceptions you can only run one set of ungrounded conductors to another building.

In the single circuit situation you still want a disconnect ... ?

Greg Fretwell
Joined: Jan 2004
Posts: 1,507
Greg- Not quite sure what you mean by "L/L" but for my case he ran a 20a. 120/240v. multiwire branch circuit and a 40a. 240v, welder circuit.

George Little

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