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how many circurts per neutral #11921
07/26/02 07:48 PM
07/26/02 07:48 PM
L
lynnbar  Offline OP
Junior Member
Joined: Jul 2002
Posts: 6
volga west virgina usa
just a dumb little question, ive seen this in a few boxs where they will use one neutral per three circurts, I myself like to give each circurt its own neutral.
is this becoming or has been a way to save money. just wondering is all thanks joe

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Re: how many circurts per neutral #11922
07/26/02 08:19 PM
07/26/02 08:19 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Joe, I'm going to assume you are new into the trade. Please research branch circuit multiwire covered in the NEC Article 100.
as well as 300 and 310 and more.

I don't mean to leave you hanging, but if you read these articles it will help more than an answer on the internet.

Remember that a grounded conductor per one circuit is not a neutral in reality.

Roger

Re: how many circurts per neutral #11923
07/26/02 08:27 PM
07/26/02 08:27 PM
L
lynnbar  Offline OP
Junior Member
Joined: Jul 2002
Posts: 6
volga west virgina usa
roger,
thanks and youre not leaving me hanging there at all. ill take the time to check it out. Joe

Re: how many circurts per neutral #11924
07/26/02 09:05 PM
07/26/02 09:05 PM
D
dana1028  Offline
Member
Joined: Jan 2002
Posts: 163
San Carlos, CA
Joe -

You asked if 'this' was a way of saving money....I'm sure that may play some part with this practice, but if you check out 310-15(b)(4)(a) [1999] this will give a good reason for using the shared neutral. Example: if you tried to pull 6 circuits in a conduit using your one-neutral-per-circuit method you would have to derate the conductors 50% (Table 310-15b2a)... #12 THHN would only be rated for a 15A circuit ... using the shared neutral process you only derate 20%....in fact, you could get nine 20A circuits (using #12THHN) in one conduit (shared neutral method)vs. only 4 circuits using your method....god I hope I didn't blow my arithmetic!

Re: how many circurts per neutral #11925
07/26/02 09:10 PM
07/26/02 09:10 PM
L
lynnbar  Offline OP
Junior Member
Joined: Jul 2002
Posts: 6
volga west virgina usa
Dana,
that clears it up for me and i do see your point. Joe

Re: how many circurts per neutral #11926
07/26/02 09:20 PM
07/26/02 09:20 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
lynnbar,

You have to realize that this is only an option under certain circumstances, it cannot always be done. For what you describe it would have to be a Three-Phase system and all on different 'phases' or 'legs'.

Bill

Re: how many circurts per neutral #11927
07/26/02 09:24 PM
07/26/02 09:24 PM
L
lynnbar  Offline OP
Junior Member
Joined: Jul 2002
Posts: 6
volga west virgina usa
bill,
thats where i seen this at on a 3 phase panel, joe


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