G Definitions

Definition Categories


A garage is a space for parking motor vehicles that is completely closed to the outdoors on three or more sides. A space with three solid walls and an opening with or without a vehicle door is a garage. See carport.


Glazing is the transparent or translucent material in a window, door, or skylight. Glazing is usually glass and also includes glass substitutes such as plastic and glass or plastic block.

Ground (grounded)

A ground (grounded) connection is the return path through which alternating current electricity flows to complete a circuit. A grounded conductor is connected to the earth or to some body that serves as the earth. A grounded connection may be intentional (as in a circuit’s grounded conductor) or it may be unintentional (as in a ground fault).

Ground fault

A ground fault occurs when metal that is not normally energized becomes energized. Examples of a ground fault: (a) the hot (ungrounded) wire in a motor is damaged or disconnected and touches the motor’s case energizing the case; (b) a screw penetrates the insulation of a hot (ungrounded) wire in an electrical panelboard and energizes the cabinet; (c) damaged insulation on a hot (ungrounded) wire allows the conductor to touch copper water pipe energizing the pipe.

Grounded wire

A grounded conductor, broadly defined, is any conductor that is intentionally grounded. The common term for the grounded conductor in residential electrical systems is the “neutral” wire or conductor. The grounded conductor is a current-carrying conductor. You should treat it as such when working with electrical circuits. Grounded conductors are usually insulated with white or light gray colored insulation.

Grounding electrode

A grounding electrode is a component in contact with the earth that provides the grounding connection for the electrical system. Common residential grounding electrodes include a copper rod driven at least (≥) 8 feet into the ground, or a copper water service pipe, or a piece of reinforcing steel embedded in the footing.

Grounding electrode wire

The grounding electrode conductor is a wire that connects the grounding electrode to the grounded conductors. In most residential electrical systems, the only connection between the grounding electrode conductor and the grounded conductors should occur at the service equipment.

Grounding wire

A grounding conductor, also called an equipment grounding conductor, connects electrical equipment directly to a grounding electrode. This connection usually occurs at a grounding bus or terminal bar at the service equipment that is in turn connected to a grounding electrode. Grounding conductors are bare wires or may be insulated with green colored insulation.


Something is considered guarded if it is surrounded by a barrier that limits contact. The guard could be a fence, enclosure, cover, screen, or access could require mounting a raised platform.