Most of the places I've lived in have had the following issue. My computer is running on the same physical breaker as a refrigerator and the overhead lights in a room. The refrigerator kicks on, causing at best the lights to flicker and at worst the breaker to trip.
Why does this happen?
Better, if I were designing a house from the ground up, how could I account for this potential problem in the electrical layout of the house and prevent it from happening altogether?