Personally, I like to see the phases run ABC+N together whenever possible for reduction of not only inductive losses in metal conduit, but also reduction EMI in non-metallic.

Even though it's cleaner for termination, running AAA BBB CCC NNN can create a lot of inductive loss in conduit or EMT.

This a 1MW Genset? Size doesn't matter, the runs just get heavier [Linked Image] The ground wire would be calculated like any other service. Be careful with the neutral!

[This message has been edited by SteveFehr (edited 01-05-2007).]