A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.
A system or circuit (current carrying) conductor that is intentionally grounded. The neutral wire. (white, domestic; blue, international).
A conductor used to connect equipment or the grounded circuit of a wiring system to grounding electrode(s). This conductor is not intended to be a current carrying conductor except in fault conditions. The green wire (domestic), green with yellow stripe wire (international); or, the conduit or raceway are grounding conductors.
Grounding electrode conductor:
The conductor used to connect the grounding electrode (NEC 250-81) to the equipment grounding conductor and/or to the grounded conductor of the circuit at the service equipment or at the source of a separately derived system.
Interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all its associated hardware, fittings, and wiring devices, permanently or temporarily installed, which extends from the service point of utility conductors or source of a separately derived system to the outlet(s).
Such wiring does not include wiring internal to appliances, fixtures, motors, controllers, motor control centers, and similar equipment.
An enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted by the NEC.