A device that establishes an electrical connection to the earth

A load where the maximum current is expected to continue for 3 hours or more.

An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with walls of the box

Without live parts exposed to a person on the operating side of the equipment

Intermittent operation in which the load conditions are regularly recurrent

Operation at a substantially constant load for an indefinitely long time.

Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest

Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts

Operation at loads, and for intervals of time, may be subject to wide variation.

The highest current at rated voltage that a device is intended to interrupt under standard test condition

Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault

Operation of equipment in excess of normal, full-load rating, or of a conductor in excess rated ampacity that when it persist for a sufficient length of time, would cause damage or dangerous overheating.

Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions.

Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions.

The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served

Service conductors made up in the form of a cable

The conductors from the service point to the service disconnecting means

The overhead service conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service-entrance conductors at the building or other structure.

An automatic or non-automatic device for transferring one or more load conductor connections from one power source to another

A large single panel, frame, or assembly of panels on which are mounted on the face, back, of both, switches, overcurrent and other protective devices,buses, and usually instruments.

A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits.

A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system

An enclosed assembly that may include receptacles, circuit breakers, fuse holders, fused switches, buses, and watt-hour meter mounting means.

An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code

The point of connection between the facilities of the serving utility and the premises wiring

Any electric circuit that energizes signaling equipment

Any window used or designed to be used for the display of goods or advertising material whether is is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than street floor level

A protective device for assembly as an integral part of a motor or motor-compressor that, when properly applied, protects the motor against dangerous overheating due to overload and failure start.

An electrically conductive path from the point of a ground fault on a wiring system through normally-current carrying conductors, equipment, or the earth to the electrical supply source

A protective device for limiting surge voltages by discharging or bypassing surge current, and it also prevents continued flow of follow current while remaining capable of repeating these functions.

A protective device for limiting transient voltages by diverting or limiting surge current.

A complete system of air terminals, conductors, ground terminals, interconnecting conductors, arresters, and other connectors or fittings required to complete the system