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Old 07-11-2011, 04:52 PM   #1
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Mwbc?


I am rewiring part of the second floor and have a quick question. Are MWBC still allowed? Right now the whole second floor(3 bedrooms and bath) are on one circuit. Can I run a 14-3 upstairs and put 2 bedrooms on one curcuit and the other bedroom and bath lighting on the other branch? These used to be fine but thought I read somewhere the codes changed with MWBC.

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Old 07-11-2011, 05:01 PM   #2
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Mwbc?


Bedrooms now require AFCI circuit breakers, which are not usable with MWBC's (unless you get two-pole devices, which are uncommon and extremely expensive). So nowadays it's essentially impossible to wire bedrooms with MWBC's.

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Old 07-11-2011, 05:13 PM   #3
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Alright, Thanks
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Old 07-11-2011, 07:11 PM   #4
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Mwbc?


Also the bathroom needs a 20 amp circuit dedicated to the bathroom only.
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Old 07-12-2011, 12:05 AM   #5
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Originally Posted by ponch37300 View Post
I am rewiring part of the second floor and have a quick question. Are MWBC still allowed? Right now the whole second floor(3 bedrooms and bath) are on one circuit. Can I run a 14-3 upstairs and put 2 bedrooms on one curcuit and the other bedroom and bath lighting on the other branch? These used to be fine but thought I read somewhere the codes changed with MWBC.

Thanks
First thing ., the bedroom do required AFCI breaker now they adpoted the code last year and use the 2008 NEC codé editon for details and IIRC there are couple more change with state code { Comm 16 } I have to check the latest edition due I am in France for a quite while now.

My home back in Wiscosnin I am in East side of ya.

So to the point no more MWBC in resdentail useage unless you find 2 pole
AFCI they are not cheap merde., { the last one was about 80 Euros }

Unless you check with big orange to see if they have 14-2-2 NM cable { kinda special order } otherwise just a pair of 14-2's will work just fine.

And just be aware with Wisconsin did change one codé related to the smoke detectours It have to be hardwired when you remodeling and also you will need carbon moxide alarm one on each floor { unless you have all electrique aka no gaz or oil burning devices } { the law went in effect earlier this year }

If more question just holler I will steer ya in correct way.

Merci,
Marc
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Old 07-12-2011, 09:54 AM   #6
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Also the bathroom needs a 20 amp circuit dedicated to the bathroom only.
This is just for the outlet right? The lights can go on with another 15 amp circuit still can't they?

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Originally Posted by frenchelectrican View Post
First thing ., the bedroom do required AFCI breaker now they adpoted the code last year and use the 2008 NEC codé editon for details and IIRC there are couple more change with state code { Comm 16 } I have to check the latest edition due I am in France for a quite while now.

My home back in Wiscosnin I am in East side of ya.

So to the point no more MWBC in resdentail useage unless you find 2 pole
AFCI they are not cheap merde., { the last one was about 80 Euros }

Unless you check with big orange to see if they have 14-2-2 NM cable { kinda special order } otherwise just a pair of 14-2's will work just fine.

And just be aware with Wisconsin did change one codé related to the smoke detectours It have to be hardwired when you remodeling and also you will need carbon moxide alarm one on each floor { unless you have all electrique aka no gaz or oil burning devices } { the law went in effect earlier this year }

If more question just holler I will steer ya in correct way.

Merci,
Marc
Thanks Marc. I am just going to run two 14-2 wires up the wall. Along with a 12-2 for the bath outlet and a 14-3 for the smokies. I always try to do things right while everything is apart, unlike the guy that gutted the house 10-15 years ago and left a mess of knob and tube for the next person(me) to deal with!

So I think my only question right now is about the bathroom. I am planning on running a 15 amp circuit for one bedroom and the bath lights and fan and then a seperate 20 amp circuit for a dedicated bath outlet, is this acceptable or should I just place the bath lights/fan on the 20 amp circuit?

Thanks, Scott
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Old 07-12-2011, 12:29 PM   #7
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Mwbc?


20 amp circuit for the bath receptacle is acceptable. You are however permitted to put the bath lights and fan on that circuit if you wish, but not required to put them on it.
If the lights and fan are on the bedroom circuit then they will also be on the AFCI circuit.
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Old 07-12-2011, 12:36 PM   #8
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If the lights and fan are on the bedroom circuit then they will also be on the AFCI circuit.
Is there any downfall to this?

Thanks for your advice
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Old 07-12-2011, 08:05 PM   #9
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Is there any downfall to this?

Thanks for your advice
None that I know of.
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Old 07-12-2011, 10:05 PM   #10
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Is there any downfall to this?

Thanks for your advice
None AFAIK.,, as long you termated it properly.

Merci,
Marc

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