We have an older farm house that currently has 100 amp service with an old fuse box ! We recently put on an addition and ran all new wiring to the new rooms. In the cellar of the addition, we've installed a new breaker box and have 200 amp service ready to be hooked up. Is there a way to connect the wires from the "old" part of the house to the new box, or do we have to re-run all new wiring in the old part of the house ?? I've read other threads about a sub panel, but I'm not sure if that would work ???