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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. 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.=== submain breaker ===One of up to six (double) circuit breakers allowed till 1985 to be the means for disconnecting all power to a home's circuits. Since then a single "main breaker" has been the required means.=== travelers ===The pair of wires in a three-way switch system that are run (within the same cable) between one switch and the next.