OK, Here is the story, I live in NC and I manage an calibration lab "electric and mechanical... I know, no the same thing as an electrical contractor shop but still some of the same principals apply. I recently moved into a house that has 200 amps on the main and would "like" to add (2) 20A circuits to the garage. A buddy of mine said that you can only have up to amount on the main worth of breakers... if that were the case I would be 5A over already without adding anything... after adding phase A and B, I don't buy it. I would like to, and feel good about doing the job myself with an inspector checking the work after for insu. reasons, but I don't even know where to begin with the code regulations in NC. I would hate to do the job and try to get it inspected and have to rip it out and try again. Is there anyone who knows what to look for or what I need to do to plan this out?