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Sharing a neutral #201431 05/31/11 09:56 PM
Joined: Dec 2004
Posts: 78
C
Cinner Offline OP
Member
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?

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Re: Sharing a neutral [Re: Cinner] #201441 06/01/11 12:47 AM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
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 12:57 AM
Joined: Dec 2004
Posts: 78
C
Cinner Offline OP
Member
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 11:30 AM
Joined: Jul 2005
Posts: 183
J
jay8 Offline
Member
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 03:30 PM
Joined: Jul 2005
Posts: 183
J
jay8 Offline
Member
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


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