my house currently has a 150A main panel. since i am dividing the house into two units but cannot yet for various reasons get two separate meters, at least i want each unit to have independent access to their breakers so a subpanel is the answer.
Q1. if the main panel is 150, can the subpanel also be 150? i the subpanel effectively will need a maximum of really 80-100A, since both the dryer and stove and water heater are gas, i.e. not electric. so the biggest appliance would really be the washer. there are window AC units though, during the summer. the unit that will have the breakers in the main panel will be using more since the dryer, water heater, range, as well as the radiator hydronic heater will use electric. i do not know what the meter is but i guess it corresponds to the 150A of the main panel.
Q2. when charging the subpanel from the main panel, if the subpanel is 150A but i never expect that i will reach that kind of amperage at any given time, do i still use a 150A breaker in the main panel or something less? and which gauge wire do i use for 120, 240, neutral and ground (can the ground be smaller than the rest?)?
Last edited by amakarevic; 08-08-2012 at 02:39 PM.