ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Changing a Bulb
by gfretwell. 07/14/18 03:12 PM
Tray cable?
by gfretwell. 07/11/18 10:18 PM
Eaton Heavy Duty 30A and 60A Safety Switches
by Admin. 07/11/18 09:49 PM
ORTOVOX Recalls Avalanche Transceivers
by Admin. 07/11/18 09:44 PM
Tingle off the water spigot
by gfretwell. 07/08/18 12:58 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 6 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Sharing a neutral #201431
05/31/11 10:56 PM
05/31/11 10:56 PM
C
Cinner  Offline OP
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
On a 3 phase panel - if 2 circuits share a neutral - do you have to use a 2 pole breaker so that if one trips they both trip?

Tools for Electricians:
Re: Sharing a neutral [Re: Cinner] #201441
06/01/11 01:47 AM
06/01/11 01:47 AM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 946
Regina, Sask.
14-010. It depends on whether the circuit feeds lights or plugs.

It isn't a trip issue, though. We can still use fuses as long as we include a disconnect that meets the requirements of 14-010(b).

Re: Sharing a neutral [Re: twh] #201442
06/01/11 01:57 AM
06/01/11 01:57 AM
C
Cinner  Offline OP
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
It is for receptacles. Can you use 15 amp single pole breakers if the neutrals are being shared to more than one circuit?

Re: Sharing a neutral [Re: Cinner] #201444
06/01/11 12:30 PM
06/01/11 12:30 PM
J
jay8  Offline
Member
Joined: Jul 2005
Posts: 183
Vancouver, BC
the trade practice for three phase 4 wire circuits feeding 120/347 volts loads is single pole breakers. I could see good justification for a three pole breaker to ensure a circuit is completely disconnected included any current on a shared neutral but I dont think any code rule requires it. If the receptacle/load is using more than one phase then you need to use 2 or 3 pole breaker.

Re: Sharing a neutral [Re: jay8] #201447
06/01/11 04:30 PM
06/01/11 04:30 PM
J
jay8  Offline
Member
Joined: Jul 2005
Posts: 183
Vancouver, BC
and before a bunch of posts come about the implications of common breaker handle for single phase loads, I can see some change in installation practice that will reflect the issue of current on shared neutral - such separate neutrals etc


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 5
Popular Topics(Views)
248,112 Are you busy
185,565 Re: Forum
174,882 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 15 (0.003s) Memory: 0.9669 MB (Peak: 1.1087 MB) Zlib enabled. Server Time: 2018-07-18 10:59:29 UTC