Hello. I have 400 amp service that's split at the meter into two SE cables each feeding adjacent 200 amp main service panels installed in my basement. I want to install a generator transfer switch, but, unfortunately, the circuits I want to supply with the generator are not all in one panel. In addition, there is not enough slack in the branch circuit cables to simply swap circuits between the two main panels. I've ruled out a single 400 amp switch, so my options appear to be: (a) Install a conduit between the two main panels, or (b) Install junction boxes to allow me to swap circuits between the panels. I've looked through the NEC, but I don't see anything that would prohibit either option. Am I missing something? Is there a better solution to this situation?