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Conductors in Parallel #10107
05/31/02 12:32 AM
05/31/02 12:32 AM
A
arseegee  Offline OP
Member
Joined: Jan 2002
Posts: 324
Statesboro, GA USA
Is there a code stating the maximum number of conductors allowed to be paralleled. I know 1/0 is minimum size but found no limit on how many. I want to use four 350KCM per phase instead of two 1000KCM. Kinda tough to work that fat stuff into the bottom fed switchgear.

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Re: Conductors in Parallel #10108
05/31/02 01:27 PM
05/31/02 01:27 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Four conductors per phase can be used under NEC 310-4, if the equipment is intended for 4 cdr/ø. Keep lengths equal and similarly routed for each group. If 1000kcmil is specified and there’s code-adequate bending space, use it! Won’t kill you.

Re: Conductors in Parallel #10109
05/31/02 05:06 PM
05/31/02 05:06 PM
G
Gwz  Offline
Member
Joined: Apr 2002
Posts: 197
I don't think there is a Maximum number as long at the terminations are made to accept the number of the parallel conductors.

Going from a bus to a bus I would think is virtually unlimited.

To devices such a Circuit Breakers the available (listed) lug pattern for that CB would be the determining factor.

Re: Conductors in Parallel #10110
05/31/02 08:40 PM
05/31/02 08:40 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
I don't believe their is a maximum # of parallel conductors, as long as they meet the conditions of 310.4 ('02), or 310-4 ('99)

Re: Conductors in Parallel #10111
05/31/02 09:53 PM
05/31/02 09:53 PM
N
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
I have never heard of a maximum. The more you do the harder it gets to keep them all "the same length" I have had the pleasure [said with much sarcasm] of terminating 12 runs of 500MCM paralleled myself. (And 10 runs of 600 MCM come to think of it) It is really not that bad IF you have sufficient room and you realize you are not going to finnish before lunch the day you start. (you probably won't finnish before lunch the following day either!)


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