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I am wiring a 3 phase 4 wire 120/208 200A 42 circuit breaker panel tomorrow. I am going to use 3/0 copper and #6 for ground. I then started second guessing myself about the wire size. The neutral will not be counted towards the ampacity because it is only drawing the unbalance current. I dont have to upsize my 3/0 because of the more than 3 wire in a conduit rule right? Everything is going to be 120v single phase loads. Only using 14 circuits. As long as I balance my phases, I shouldnt have a problem with inspector.

thanks for your input.
 

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I am wiring a 3 phase 4 wire 120/208 200A 42 circuit breaker panel tomorrow. I am going to use 3/0 copper and #6 for ground. I then started second guessing myself about the wire size. The neutral will not be counted towards the ampacity because it is only drawing the unbalance current. I dont have to upsize my 3/0 because of the more than 3 wire in a conduit rule right? Everything is going to be 120v single phase loads. Only using 14 circuits. As long as I balance my phases, I shouldnt have a problem with inspector.

thanks for your input.

Sounds good to me.
 

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If you follow the guidelines of the NEC there's little you could do to mess it up. Even if you didn't balance the loads.
 

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darren79 said:
That could totally mess it up since the OP is in Canada:laughing:
Good point. Change NEC to CEC and the sentiment remains
 

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Good point. Change NEC to CEC and the sentiment remains
Another few code cycles and CEC will be reduced to NEC standards, SE cable, no panel divider, NMD ( Romex for you guys) entering panels with no connectors, :eek:. Maybe even no need to have a license to call yourself an electrician
 

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No, other than you're calling for a Grounding conductor, not a bonding conductor...

Also, Im assuming you're counting the neutral conductor in your pipe fill, and you didn't mention if this is a service, subservice, or sub panel.
 

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Is the nipple rigid steel with 4 lock nuts and bushings?

Either way, I would run a bonding conductor to be safe, but thats all it is.... an equipment bond.
 
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