I am in preparation to move in new house with two car garage. I am planning to put 100 amp subpanel there. I will hire an electrician to do the job, but curious if the other end of the line is connected somewhere in main panel? Main panel is 200 AMP and if subpanel will consume in 100 amp range, will it drain main panel too much to feed rest of the house at the same time? What is your thinking, experience?