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Old 06-15-2014, 08:10 AM   #1
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Multiwire Branch Circuit Question


Sorry about the TINY pics.

The home is currently wired as a multibranch circuit with all of the top receptacles on one breaker and the bottoms on another.

What I'd like to do is make the 4th outlet in the chain on a separate breaker and the other outlets on another breaker. I was going to make that one receptacle for my a/c

First pic is the way it is wired now. Second is what I'd like to do. Any issues with doing this?
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Old 06-15-2014, 08:34 AM   #2
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Multiwire Branch Circuit Question


Not a problem, just ensure that all the neutrals are pigtailed together, at each junction box.

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Old 06-15-2014, 08:43 AM   #3
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Multiwire Branch Circuit Question


Cool, I figured it would be ok but wanted to make sure. Thanks
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Old 06-15-2014, 08:53 AM   #4
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Multiwire Branch Circuit Question


MWBC's should never be used in residential as they are highly dangerous in could result in an unnecessary fatality if altered by a non electrician.

http://ecmweb.com/content/multiwire-...n-be-dangerous
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Old 06-15-2014, 09:10 AM   #5
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MWBC's should never be used in residential as they are highly dangerous in could result in an unnecessary fatality if altered by a non electrician.
The entire house is wired this way. I'm slowly fixing them room by room but can only do so much in the day.
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Old 06-15-2014, 09:28 AM   #6
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Originally Posted by skobydog View Post
The entire house is wired this way. I'm slowly fixing them room by room but can only do so much in the day.
There is nothing wrong with it being wired that way...
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Old 06-15-2014, 09:57 AM   #7
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There is nothing wrong with it being wired that way...
What about this

http://www.nfphampden.com/mbc.pdf

http://www.homeinspector.org/resourc...h-Circuits.pdf

http://activerain.trulia.com/blogsvi...andem-breakers
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Old 06-15-2014, 09:58 AM   #8
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Multiwire Branch Circuit Question


What about anything? It's all dangerous, and why live circuits should never be worked on. I've seen electricians open up neutrals on MWBC's, and lets not forget the fact that every service is a MWBC...

Last edited by stickboy1375; 06-15-2014 at 10:02 AM.
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Old 06-15-2014, 10:05 AM   #9
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Multiwire Branch Circuit Question


YEs, it's all dangerous, but, mwbc's should not be installed in residential because the propensity of diy's, maintainance, and HO's not knowing what they are doing can cause more than normal catastrophic effects. Until the day that only highly skilled electricians that are highly trained to work on mwbc's are allowed to do electric on residential (like myself), mwbc's should be banned until further notice...
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Old 06-15-2014, 10:07 AM   #10
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Multiwire Branch Circuit Question


Quote:
Originally Posted by Cletis View Post
YEs, it's all dangerous, but, mwbc's should not be installed in residential because the propensity of diy's, maintainance, and HO's not knowing what they are doing can cause more than normal catastrophic effects. Until the day that only highly skilled electricians that are highly trained to work on mwbc's are allowed to do electric on residential (like myself), mwbc's should be banned until further notice...
Yes, nice trolling....
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Old 06-15-2014, 10:07 AM   #11
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Multiwire Branch Circuit Question


Quote:
Originally Posted by Cletis View Post
YEs, it's all dangerous, but, mwbc's should not be installed in residential because the propensity of diy's, maintainance, and HO's not knowing what they are doing can cause more than normal catastrophic effects. Until the day that only highly skilled electricians that are highly trained to work on mwbc's are allowed to do electric on residential (like myself), mwbc's should be banned until further notice...
MWBCs are not dangerous. Untrained people mucking with them are dangerous.
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Old 06-15-2014, 10:08 AM   #12
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Quote:
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MWBCs are not dangerous. Untrained people mucking with them are dangerous.
Same lines go for Electricity in general.... no need to limit the categories....
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Old 06-15-2014, 10:30 AM   #13
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Multiwire Branch Circuit Question


What about electricians giving DIY's electrical advise ? Aiding and Abetting ?
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Old 06-15-2014, 11:17 AM   #14
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What about electricians giving DIY's electrical advise ? Aiding and Abetting ?
Aiding and abetting a safe installation or code compliant answer to avoid otherwise. Homeowners (DIY) come here to get clarification and help those that don't take the time and think they understand are the ones that open neutrals on multiwire branch circuits, wire them wrong or tap them incorrectly.

You, me nor the NEC can prevent stupid. Besides the NEC cannot consider untrained people working on electrical installations.

Would you rather have homeowners giving other homeowners electrical advice without oversite by a professional?

Forums like this exist for those who recognize they are not skilled in electrical but seek professional help or correct answers. Aside from that it is a given that homeowners are going to do the electrical work with or without advice from a professional.

I take a lot of pride in this forum and the work we do here. It's like a classroom for DIYers who want to learn how and work safely on the electrical in their homes and projects.

As for MWBC there are literally thousands currently installed. They have great advantages in some installations. They are not used as much anymore in residences but they are not unsafe ... that is the wrong word.

What you are really saying is that many homeowners don't have a clue what an MWBC is and decide to wire something up anyway. As a result they get themselves into a pickle. That's stupid not unsafe .....
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Old 06-15-2014, 11:34 AM   #15
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Multiwire Branch Circuit Question


MWBC don't play nice with *FCI breakers (required in many rooms by current NEC). One good reason not to use them in residential, aside from the experience factor.

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