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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. 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.=== BX cable ===An armored cable historically known as BX and more correctly as Type AC is a fabricated assembly of insulated wires in flexible metallic armor, formed by wrapping an interlocking metal strip around the conductors. Typically this is a hot, neutral, and ground set of copper wires with colored plastic insulation ran though a flexible metal conduit. The "BX" name is actually an old GE trademark, but is now loosely applied to any flexible metal armored wiring like those with individual wires running through a flexible metal conduit. These flexible armored cables usually consist of a helically wound steel strip. BX cable is typically used in a commercial setting where as Romex is used in a residential setting.=== GFI ===Ground fault interrupters are designed to protect from electrical shock by interrupting a household circuit when there is a difference in the currents in the "hot" and neutral wires. Such a difference indicates that an abnormal diversion of current from the "hot" wire is occurring. Such a current might be flowing in the ground wire of a device or it may be occurring because a person has come into contact with the "hot" wire and is being shocked.GFI's are required by the electrical code for receptacles in bathrooms, some kitchen receptacles, some outside receptacles, and receptacles near swimming pools. The GFI has a "Test" button which causes a small difference between "hot" and neutral currents to test the device. A GFI does not require an earth ground to work (protect people from currents >10mA). A surge suppressor requires an earth ground to function properly (protect equipment from high voltages).Modern Romex is a term describing plastic-coated wiring (typically 10-, 12-, or 14-gauge copper) wrapped in another plastic moisture resistant sheathing. Romex is technically a brand name but the name is commonly applied to all flexible outer plastic sheathed cable consisting of a pair of inner plastic insulated wire, one black for hot and one white for neutral, and an uninsulated bare copper wire for the earth ground, along with a strip of paper to prevent stretching of the copper during wire pulling. Romex does not protect the inner wires against punctures, perforations, lacerations which is why code requires the use of protective conduit or BX cable be used. Romex should not be exposed to direct sunlight, excessive moisture, or conditions that could otherwise damage the plastic sheathing. === 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.