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Otherwise known as a panel or panel box. It is a metal box in a building containing breakers for each electrical circuit. The "main" panel or "service" panel would be the central source for the home and would be receiving its power from the power company. The standard U.S. household wiring design has two 120 volt "hot" wires and a neutral which is at ground potential. The two 120 volt wires are obtained by grounding the centertap of the transformer supplying the house so that when one hot wire is swinging positive with respect to ground, the other is swinging negative. This versatile design allows the use of either hot wire to supply the standard 120 volt household circuits. For higher power applications like clothes dryers, electric ranges, air conditioners, etc. , both hot wires can be used to produce a 240 volt circuit.Also known as a panel, panel box, entrance box, and fuse box (legacy). It is a metal box in a building containing breakers for each electrical circuit. The "main" panel or "service" panel would be the central source for the home and would be receiving its power from the power company. The standard U.S. household wiring design has two 120 volt "hot" wires and a neutral which is at ground potential. The two 120 volt wires are obtained by grounding the centertap of the transformer supplying the house so that when one hot wire is swinging positive with respect to ground, the other is swinging negative. This versatile design allows the use of either hot wire to supply the standard 120 volt household circuits. For higher power applications like clothes dryers, electric ranges, air conditioners, etc. , both hot wires can be used to produce a 240 volt circuit.