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Does NEC allow running multiple 480V 3 Phase Power load conductors in a single conduit instead of running each 3 phase loads conductors in separate conduits?
 

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Discussion Starter · #3 ·
Sorry !! If my post language is not clear let me try to clarify Does NEC allow running 3 phase feeders of more than one 480V, 3 Phase loads in a single conduit instead of running each load feeders in a separate conduits? Example say for 2 - 50 HP motors running instead of running in 2 separate 1 1/4 inch conduits with 3#4 AWG -each run 6 #4 AWG in say 2 Inch conduit? Hope this is clear.
 

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Discussion Starter · #4 ·
Sorry !! If my post language is not clear let me try to clarify Does NEC allow running 3 phase feeders of more than one 480V, 3 Phase loads in a single conduit instead of running each load feeders in a separate conduits? Example say for 2 - 50 HP motors running instead of running in 2 separate 1 1/4 inch conduits with 3#4 AWG -each run 6 #4 AWG in say 2 Inch conduit? Hope this is clear.
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Yes, the only thing limiting it would be conduit fill and de-rating for # of current carrying conductors.

On that load conduit fill would only be like 15-16% (fine) and de-rating wouldn't be an issue with only 6 wires unless you are in a really hot area.
 

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I think the real question is: is there anything prohibiting it?

Sent from my new phone. Autocorrect may have changed stuff.
 

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Those aren’t feeders if they are off the starters. Those are branch circuits. You need to derate for more than 3 current carrying conductors though. It is not uncommon to have a dozen or more circuits in wide cable trays where the derating rules are not so severe.
 

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Seriously? If you have 2 motors, generally, you will need 2 conduits, one to each motor. If you run one conduit, how do you feed 2 motors? Or, how do you come out of 2 motor starters, with one conduit? Unless it's an MCC.
 

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I know a guy that knows a guy that might have pulled in 12 sets of 10 and 12 sets of 12 and half a dozen green ones in a 2".


Haha like all those panels I’ve seen with a 2” conduit up to a pull can with 42 MC/BX connectors in it


Sent from my iPhone using Tapatalk
 
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