JayTKR wrote:

Thanks.

That's what I thought -- that 200 amps at 240 volts is basically 400 amps
available at 120 volts. Or, for example, if 50 of the 200 amps were for a
240 volt circuit, that would leave 150 amps at 240 which could be 300 amps
at 120 volts.

One other complicating factor is the 125A max branch circuit limitation.
Not an issue in normal residential application of course as few people
have single loads over 125A, but something to keep in mind when feeding
subpanels.