upgrading to 400A service
We currently have 200A service, with an overhead cable. We're thinking of burying the cable, which I know is an involved process.
Anyway, local power co. told me they could do that (at great expense), but that we would have to upgrade to 400A service. We don't really need more than 200A (gas heat), although I suppose more can't really hurt.
My question is if we had 400A service, (1) could we retain existing 200A panel and simply add another 200A panel? If we do that (2) do we have to balance loads between the two panels, meaning moving circuits from one to the other? Or could we have a second panel that is effectively empty until the point we need the service?