I currently have a 100amp main service box but it is all full and some are even doubled up. I'm wondering if I can hook up a 100amp subpanel off of it. If so what size wire to go with?
It would be on the same wall next to it within 12 inches. Do I have to use a conduit between the two, or does it have to exit the bottom of the main to the top of the subpanel?
Also, all I'm seeing at a local store are 100 amp main boxes. Is that allowable by code to use as a sub? I know the sub can't have neutral bonded by that screw either way.
My local town in Illinois uses the 2011 NEC handbook. Sorry for so many questions, but I just want to do it right. Thanks.