Fedup:
"The 320 are rated 100%" then they are 320 amps, right??
I'm not trying to be a smarta**.
Virgil:
You are paralleling the 3/0 feeder(s) from the 400 amp main to the 2 panels....are they the same length??? You may want to go with the 2x200 discos; might be cheaper and easier.
Just a thought.
Good Luck with the bid!
John
