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Old 08-11-2012, 10:51 PM   #1
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


If I'm reading my instruction sheet correctly my QO 15A CAIF it will trip instantly for a shared neutral. Does that mean that I am not allowed to use it to feed 1/2 of a MWBC?

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Old 08-11-2012, 11:00 PM   #2
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


That is correct...and one of the huge downfalls of AFCI's. Although some manufacturers are starting to produce 2 Pole AFCI breakers. I think Siemans is one and I forget the other one.

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Old 08-11-2012, 11:18 PM   #3
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


Thanks, I didn't realize it right away. Going to have to run those 2 a little different then.
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Old 08-12-2012, 06:10 AM   #4
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


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Originally Posted by k_buz View Post
... I think Siemans is one and I forget the other one.
Cutler-Hammer comes to mind ....
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Old 08-12-2012, 11:13 AM   #5
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


Square D makes 2pole AFCI's.... QO style too.
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Old 08-12-2012, 11:15 AM   #6
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


Link? A quick Google search did not provide any matches.
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Old 08-12-2012, 11:19 AM   #7
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


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Link? A quick Google search did not provide any matches.
I cant find a link either, but Im almost positive we just did a job with a panel full of them.


I will verify this on monday... Sq D's website is pretty bogged up....

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Old 08-12-2012, 12:08 PM   #8
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


I thought Cutler was one of the few making a 2 pole AFCI.
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Old 08-12-2012, 12:11 PM   #9
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


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I thought Cutler was one of the few making a 2 pole AFCI.
I have found CH and Siemans. This is the interesting thing, the code has been around for a long time now and only two types have been produced and nobody has came out with a listed AFCI receptacle. Why? Seems like the code is ahead of the technology.
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Old 08-12-2012, 12:27 PM   #10
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


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Originally Posted by k_buz View Post
I have found CH and Siemans. This is the interesting thing, the code has been around for a long time now and only two types have been produced and nobody has came out with a listed AFCI receptacle. Why? Seems like the code is ahead of the technology.
AFCI receptacles would be a sweet deal, and fix the multiwire branch circuit issues... Of course, I just rough in with 14-2-2 or 12-2-2.. so it's a non issue for me.
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Old 08-12-2012, 12:32 PM   #11
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


The problem with AFCI receptacles is you have to meet a number of criteria to install them.

From 2011

Quote:
Exception No. 1: If RMC, IMC, EMT, Type MC, or steel
armored Type AC cables meeting the requirements of
250.118 and metal outlet and junction boxes are installed
for the portion of the branch circuit between the branchcircuit
overcurrent device and the first outlet, it shall be
permitted to install an outlet branch-circuit type AFCI at
the first outlet to provide protection for the remaining portion
of the branch circuit.
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Old 08-12-2012, 12:34 PM   #12
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Can I feed 1/2 a MWBC from a combination arc fault interrupter(CAIF) breaker?


Quote:
Originally Posted by k_buz View Post
The problem with AFCI receptacles is you have to meet a number of criteria to install them.

From 2011
Im betting there is no market place for the device, meaning, too expensive to produce for such little demand. I could be off on this of course. Not sure as a manufacture I would invest in this product though.

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