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#212521 - 01/16/14 03:19 AM Emergency circuits mwbc extension  
brother  Offline
New Member
Joined: Nov 2008
Posts: 7
tn
I asked this on other forums, would like to hear from here.


Since the 2014 NEC will not allow mwbc for emergency circuits, I assume this will apply to any extension of an existing mwbc. Am I correct in this thinking?

At present there is a small job that wants to add another emergency receptacle and relocate an existing one but the existing circuits are all mwbc. Will this be a code violation to move the existing receptacle that is al ready on the mwbc?


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#212524 - 01/16/14 04:14 PM Re: Emergency circuits mwbc extension [Re: brother]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,872
Brick, NJ USA
brother:
Could you post where in '14 this is?
I briefly scanned thru '14 and couldn't see anything?
Chapter 5 healthcare? Chapter 7??


John

#212525 - 01/16/14 06:40 PM Re: Emergency circuits mwbc extension [Re: brother]  
ghost307  Offline
Member
Joined: May 2005
Posts: 916
Chicago Illinois USA
It was added to 517.18(A) and 517.19(A) in 2011.
It was added to 700.19 in 2014.


Ghost307

#212526 - 01/16/14 10:44 PM Re: Emergency circuits mwbc extension [Re: brother]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Do it fast before the local AHJ uses the more restrictive rules.

Am I the only one who sees the NEC as moving against MWBC at almost every turn?

What we're seeing is a general push for dedicated neutrals.

Somehow I feel that this is tied in to the pervasive use of back-stabbed R5-15 duplex receptacles in residential builds.

For, at bottom, isn't all of this a concern about breaking open the neutral return?



Tesla

#212527 - 01/16/14 11:27 PM Re: Emergency circuits mwbc extension [Re: brother]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,872
Brick, NJ USA
Ghost:
Thank you!!

brother:
You are using '14 NEC in Tn already??

If you were here in NJ, and extending an existing circuit, it would be no problem, as it would fall under our Rehab Code in the NJ Uniform Construction Code.


John

#212528 - 01/17/14 01:32 AM Re: Emergency circuits mwbc extension [Re: HotLine1]  
brother  Offline
New Member
Joined: Nov 2008
Posts: 7
tn
Originally Posted by HotLine1
Ghost:
Thank you!!

brother:
You are using '14 NEC in Tn already??

If you were here in NJ, and extending an existing circuit, it would be no problem, as it would fall under our Rehab Code in the NJ Uniform Construction Code.
Its the place I work at, even if the state hasn't adopted the new NEC, the practice in my place is use the most current one.

I was just curious if others have ran into this yet. I can see getting away with using mwbc for an existing'relocate' receptacle, but if you are extending to a 'new' receptacle it may be an issue.


#212529 - 01/17/14 03:51 AM Re: Emergency circuits mwbc extension [Re: brother]  
sparkyinak  Offline
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Joined: Jul 2007
Posts: 1,327
Alaska
If the 2014 is adopted and the rehab code says you can, you have a conflicting issue. Usually you would then go with the more restrictive rule


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