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
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 238 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#86163 - 09/18/03 08:07 PM Shared Neutral - 2-wire branch circuit
Bolt Offline
Junior Member

Registered: 09/18/03
Posts: 1
Loc: New York, NY USA
I have a question about the wiring in my apartment which may not be up to code (New York City building, built circa 1910). While a contractor was attempting to install a ceiling fan, I was asked to cut the power to the area of the ceiling fixture by unscrewing the fuse feeding power to it. After I did so, the contractor allowed two of several wires in the area around the fixture to touch and caused a spark--not a large one indicating a short, but a noticeable one nonetheless. I had to unscrew the fuse powering an adjacent area of the apt to keep the spark from re-occurring. I was told that the two fuse lines seemed to share a neutral. My questions are: (a) does the above description mean that a neutral wire is actually being shared by two branch circuits each with their own fuses; and (if yes) (b) is this permissible under the current code; and (if not) (c) which sections of the code would be applicable to this situation?

Thank you very much.

Top
2014 / 2011 NEC & Related Books and Study Guides
#86164 - 09/18/03 09:47 PM Re: Shared Neutral - 2-wire branch circuit
stamcon Offline
Member

Registered: 03/24/01
Posts: 322
Loc: So San Francisco CA
Bolt, it is still allowed(with conditions) to have a shared neutral. It is called a multiwire circuit. 210-4 99NEC(NY might have different codes). The bigger issue is with the person doing the electrical work, not checking for live circuits.

Top
#86165 - 09/20/03 08:18 AM Re: Shared Neutral - 2-wire branch circuit
PCBelarge Offline
Member

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
Something for you to think about is the age of the installation. Wiring in a building built in 1910 and still with fuse protection can be a very old installation. The code requirements may have been very different than and this installation will be grandfathered to that time.

Pierre
_________________________
Pierre Belarge

Top
#86166 - 11/03/03 10:28 PM Re: Shared Neutral - 2-wire branch circuit
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
(The bigger issue is with the person doing the electrical work, not checking for live circuits.)

At least he didn't do it with the both of them live.... That would be a little scary.
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

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