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#99579 - 08/17/06 07:01 PM multiwire circuits and tied breakers
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
My registeration expired or i could not use my existing ID and/or password so i had to register again.

My ispection was failed because the inspector said all multiwire branch circuit that share a neutral must be on a tied breaker.

In my situation i had two single breakers on two different busbars feeding two receptacles for garebage disposer and the washing machine.

My understanding is whenever there is a peotential difference between the ungrounded conductors on one device then the breaker has to be tied.

Is he correct in his statement?

Thanks
Edward
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#99580 - 08/17/06 07:11 PM Re: multiwire circuits and tied breakers
macmikeman Offline
Member

Registered: 07/16/02
Posts: 718
Loc: Honolulu, Hawaii
In my opinion he is incorrect. As long as the two breakers are on opposing poles of the panel buss there is no code violation until they are feeding a single yolk. If they are not feeding a single yolk device than they can be 1,3,5,7,9, etc spaces apart, but I would have them right next to each other.

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#99581 - 08/17/06 08:19 PM Re: multiwire circuits and tied breakers
Larry Fine Offline
Member

Registered: 02/18/05
Posts: 684
Loc: Richmond, VA
Remember also that, when NOT using handle-tied breakers, that every neutral connection cannot depend on the receptacle screws, but must be joined, and terminals pigtailed.
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Larry Fine
Fine Electric Co.
fineelectricco.com

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#99582 - 08/17/06 09:22 PM Re: multiwire circuits and tied breakers
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
Larry, I ALWAYS- ALWAYS make pigtails.

If you think the inspector is right or has an argument please give me a code reference i can not find any NEC reference that supports his statement.

Thanks
Edward
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#99583 - 08/17/06 09:42 PM Re: multiwire circuits and tied breakers
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Edward

Did you mean disposal and dishwasher ? Are you feeding a single split wired duplex receptacle with this circuit? If you are feeding a split wired duplex with this circuit you need a handle tie or a 2 pole breaker. As long as both of these circuits do not connect to a single device (yoke) you don’t need a handle tie or 2 pole breaker.

What city is this in?

Curt
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#99584 - 08/17/06 10:53 PM Re: multiwire circuits and tied breakers
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
Curt,

It is San Jose.

I always use two separate receptacles.
The inspector said everytime you have multiwire branch circuits and share a neutral, you must use tied breakers.

???????

Thankx
edward
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#99585 - 08/17/06 11:01 PM Re: multiwire circuits and tied breakers
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
I'm sure this was a combo inspector. Call the city and ask to speak with the electrical supevisor for the area your project is in. Don't change the breaker just to make him happy.

Curt
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Curt Swartz

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#99586 - 08/18/06 10:36 AM Re: multiwire circuits and tied breakers
trobb Offline
Member

Registered: 06/08/06
Posts: 111
Loc: Iowa City, IA
The flat I just moved out of had this configuration- common duplex receptacle feeding a dishwasher and a disposal, two circuits, handle tied. For me, it makes sense because this way you won't run into a half-dead box assuming it's fully dead.

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#99587 - 08/18/06 02:38 PM Re: multiwire circuits and tied breakers
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
 Quote:
Remember also that, when NOT using handle-tied breakers, that every neutral connection cannot depend on the receptacle screws, but must be joined, and terminals pigtailed.


This applies handle ties or not.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#99588 - 08/18/06 03:23 PM Re: multiwire circuits and tied breakers
Larry Fine Offline
Member

Registered: 02/18/05
Posts: 684
Loc: Richmond, VA
Right you are!

300.13 Mechanical and Electrical Continuity — Conductors.

(B) Device Removal. In multiwire branch circuits, the continuity of a grounded conductor shall not depend on device connections such as lampholders, receptacles, and so forth, where the removal of such devices would interrupt the continuity.

[This message has been edited by Larry Fine (edited 08-18-2006).]
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Larry Fine
Fine Electric Co.
fineelectricco.com

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