Not in the breaker box, in the closet where electric, cable enter the house and the sump pump exits. There is room to put the modem on the wall away from the box. With the breakers in a metal box and all the electric in conduit I assume the EMI should be minimized.That's what I was thinking. I would hate to have this for a year and then find out I really should have CAT 6. For the price difference, if there are now down sides, Ill likely go that way.