ECN Forum Forums Code Related Discussion NEC & other Code issues Multiwire Branch Circuit

I think you need some means of disconnecting the circuits at the detached building if there is more than one circuit

Got a disconnect in the detached garage DPST switch.

Iwire, how did you run one side of a multiwire circuit feeding a 30a load, and the other feeding a 20a load?

Do they make such a combination 30/20 2pole breaker?

Dnk....

Doesn't have to be a two pole breaker.

George you are right.

It can be a fused disconnect, but why?

They also can be single pole breakers with approved handle ties, but that would make it a 2 pole breaker for all pratical purposes.

So I ask again, Do they make 30/20 combinations 2 pole breakers?

Dnk.........

I have never seen one, there would be to little call for it.

I did not need or use handle ties, I don't remember if the 20 and 30 amp breakers where even side by side.

Dnk, there is no reason for both OCPD's to open both ungrounded conductors at the same time in this circuit.

Roger

Is that because they are not on the same yoke?

Dnk, yes. Reference 210.4(B)and 210.7(C) in the latter a multiwire branch circuit may not fit the discription. (further discussion? )

Roger

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

Does this "detached" structure require a seperate grounding electrode per 250-32 since this building is supplied by more than 1 branch circuit?