ECN Forum Forums General Topics of the Trade General Discussion Area 3 phase multi pvc conduit ?

Have been reading the good book, and am confused....

Situation:
1500A 3 phase 480 gen set. About 200' run. 3 x 750 MCM Copper per leg. PVC Sched 80, not RMC. How group? Each parallel run could be ABC + N. Or AAA, BBB, CCC, NNN, and then add EGC? Or, do I need to do ABC, ABC, ABC, NNN. EGC in additional pipe?

Can I do it in 4 4" runs, or do I need 5? How big does the ground need to be? Proposed ground is a good UFER - 3', 6' and 10' rebar grid - similar one gave me about 6 ohms. What about far (200') end?

Depending on which table I go to, I see 3 or 4 750 MCM's.....and then EGC...

Need to spec and bid....

Advice? Help?

Thanks!

Grov