The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Locked rotor, no burnout
by geoff in UK
Today at 02:04 PM
Temporarily feeding a panel...
by Potseal
09/29/16 11:05 PM
Massive power outage South Australia
by Meadow
09/29/16 06:46 AM
short circuit??
by Meadow
09/29/16 06:43 AM
Norwegian power?
by Meadow
09/29/16 06:36 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 11
sparky 10
gfretwell 8
Potseal 7
Vlado 6
Who's Online
1 registered (Webmaster), 310 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#212521 - 01/15/14 11:19 PM Emergency circuits mwbc extension
brother Offline
New Member

Registered: 11/28/08
Posts: 7
Loc: 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?

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#212524 - 01/16/14 12:14 PM Re: Emergency circuits mwbc extension [Re: brother]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6786
Loc: 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

Top
#212525 - 01/16/14 02:40 PM Re: Emergency circuits mwbc extension [Re: brother]
ghost307 Offline
Member

Registered: 05/09/05
Posts: 877
Loc: 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

Top
#212526 - 01/16/14 06:44 PM Re: Emergency circuits mwbc extension [Re: brother]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: 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

Top
#212527 - 01/16/14 07:27 PM Re: Emergency circuits mwbc extension [Re: brother]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6786
Loc: 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

Top
#212528 - 01/16/14 09:32 PM Re: Emergency circuits mwbc extension [Re: HotLine1]
brother Offline
New Member

Registered: 11/28/08
Posts: 7
Loc: 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.

Top
#212529 - 01/16/14 11:51 PM Re: Emergency circuits mwbc extension [Re: brother]
sparkyinak Offline
Member

Registered: 07/08/07
Posts: 1286
Loc: 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
_________________________
"Live Awesome!" - Kevin Carosa

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals