Sizing conductors and ground for 300hp motors

[Fella]

Hey guys, i think I've got enough info here and you brought up some great points on a few things i wasnt thinking, like vfd input vs output sizing.

This should be enough for me to tighten up my numbers as soon as holland gives me more info. Appreciate all the help.

 

[Besoeker3]

Actually, a 400V 50Hz motor works fine here with 480V 60Hz, because the V/Hz ratio is the same. But it will spin 20% faster, which CAN be a serious problem for centrifugal pumps and fans but with there being VFDs involved, that issue goes away.

Yes, if they are VFDs. If not...........