Yes it is a residence. I am installing a 400 amp panel feeding a 200 amp load center. It is single phase 240 volt. Sizing the feeders for the 200a load center, using THHN wire.
Got the sizing for the feeders from table B.310.1 in the 2002 NEC.
Will go the the same size on the neutral, as for the ground I believe it is #4.
