I have a job that I set up (2) 400A panelboards from an 800A Main. I wasn't given accurate information at the onset and have since learned that my Main Panelboard is 800A that no longer has 400A breakers available for it. Possibly 200A Breakers but I am still awaiting information. My question is this....I can feed a 400A Panelboard with parrallel wiring sized for 200A, am I allowed to use (2) 200A breakers each running 200A sized (#3/0) wiring to a 400A panelboard?