Bidding a job that has a 400 amp main panel on the home with 2-200 amp subpanels next to it. I would be wiring a large garage turned into a living quarters, with A/C, water heater, range, dryer, small kitchen, and lighting. Will probably have to run a new 200 amp subpanel to it. Would I be able to put a 200 amp breaker in one of the 200 amp sub-panels to feed the 3rd 200 amp? The 2 200 amp panels are fed with 4/0 wire. But that may put it over the limit. Can I add any more panels to that 400 amp service? maybe a 125 amp?
The Golden Rule - "The man with the gold makes the rule"