The fractional part of a period or cycle through which time has advanced, measured from a specified reference point and often expressed as an angle

• Phase

• Ground

A conducting connection between an electric circuit or device and the earth or other point of zero potential

• Phase

• Ground

The main disconnect for the entire electrical system of a building, except for any emergency power systems

• Service switch

• Panel

• Bus

A board on which are mounted the switches, fuses, and circuit breakers for controlling and protecting a umber of similar branch circuits, installed in a cabinet and accessible from the front only

• Service switch

• Panel

• Bus

A heavy conductor, usually in the form of a solid copper bar, used for collecting, carrying, and distributing large electric currents

• Service switch

• Panel

• Bus

Any conductor of an electrical system intentionally connected to a ground connection

• Grounded conductor

• Grounding electrode

• Ground wire

Any conductor of an electrical system intentionally connected to a ground connection

• Grounded conductor

• Grounding electrode

• Ground wire

A conductor connecting electric equipment or a circuit to a ground connection

• Grounded conductor

• Grounding electrode

• Ground wire

Of or pertaining to a circuit energized by an alternating current with one phase or with phases differing by 180°

• Single-phase

• Two-phase

• Three-phase

Of or pertaining to a circuit energized by two alternating currents or voltages differing in phase by one quarter of a cycle or 90°

• Single-phase

• Two-phase

• Three-phase