Before spamwood tries to sell you one of his overpriced products. There does seem to be an overabundance of utilities on this one circuit. The openers and sump pumps should be on dedicated circuits protected with GFI's. Go to a hardware store (Home Depot, etc.) and purchase a Tick Tracer. It runs on batteries and produces a loud buzz or tick when placed on a hot circuit. Make sure the one you purchase will read through walls. It will probably set you back @$15 or less. Before you begin the check, turn off all of your other breakers. This will eliminate false readings from other circuits. Turn on all of the fixtures to this circuit on the upper floors (ignore the openers and pumps). Now start from the lowest fixture and begin tracing up the walls and across the ceilings until you find what you are looking for. I wish more people would have the sense to label their panel boxes instead of waiting for an emergency. HAVE FUN!!!