ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by ghost307. 09/22/17 08:26 AM
Another generator question
by gfretwell. 09/21/17 02:41 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 09/15/17 11:37 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,860 Are you busy
176,620 Re: Forum
168,533 Need opinion
Who's Online Now
0 registered members (), 47 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#201431 - 05/31/11 10:56 PM Sharing a neutral  
Cinner  Offline
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:

#201441 - 06/01/11 01:47 AM Re: Sharing a neutral [Re: Cinner]  
twh  Offline
Member
Joined: Mar 2004
Posts: 918
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).


#201442 - 06/01/11 01:57 AM Re: Sharing a neutral [Re: twh]  
Cinner  Offline
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?


#201444 - 06/01/11 12:30 PM Re: Sharing a neutral [Re: Cinner]  
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.


#201447 - 06/01/11 04:30 PM Re: Sharing a neutral [Re: jay8]  
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



Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,878
Joined: October 2000
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.019s Queries: 15 (0.005s) Memory: 0.7667 MB (Peak: 0.9067 MB) Zlib enabled. Server Time: 2017-09-22 17:00:48 UTC