THE BASICS: Your home has a 120/240 volt system and, depending on the size of your home, 100 to 400 amps. Every home has a main breaker than can shut off power to the entire house. The main breaker is typically outside next to your electrical meter. Removing panel covers to access the wiring should only be done by a licensed electrician. If not handled correctly, an electrical shock and an ARC flash may cause severe burns and possibly death.