NEC DEFINITIONS - PART 1

NEC DEFINITIONS

100

The circuit conductors between the final overcurrent device protecting the circuit and the outlets

Branch circuit

200

All circuit conductors between the service equipment, the source of a separtely derived system, or other power supply source and the final branch circuit overcurrent device

Feeder

300

Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth

Accessible, readily

400

A device or group of devices that serves to govern in some predetermined manner, the electric power delivered to the apparatus to which it is connected

Controller

500

A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied wihin its rating

Circuit breaker

NEC DEFINITIONS

100

Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisiction and concerned with product ealuation, that maintains periodic inspection of production of labeled equipment or materials and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner

Identified

200

The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed

Bonding

300

The conductor used to connect the non current carrying metal parts of equipment, raceways, and other enclosures to the system grounded conductor, the grounding electrode, or both, at the service equipment or at the source of a separtely derived system

Grounding Conductor, Eq.

400

A switch rated in the horsepower that is capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage

Motor circuit switch

500

Indicates that the motor is provided with a thermal protector

Thermally protected

NEC DEFINITIONS

100

Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states that the equipment, material or servies either meets appropriate designated standards or has been tested and found suitable for a specified purpose

Listed

200

A system or circuit conductor that is intentionally grounded

Grounded conductor

300

Intentionally connected to earth throuhg a ground connection or connections of sufficiently low impedance and having sufficient current carrying capacity to prevent the build up of voltages that may result in undue hazards to connected equipment or to persons

Grounded, effectively

400

A switch intended for isolating an electric circuit from the source of power. It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means

Isolating switch

500

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 to start

Thermal protector

NEC DEFINITIONS

100

Recongnizable as suitable for the specific purpose, function, use, environment, application and so forth, where described in a paticular Code requirement

Identified

200

The current , in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating

Ampacity

300

Where this code specifies that one equipment shall be "in sight from", "within sight from" or "within sight" and so forth of another equipment, the specified equipment is to be visible and not more than 15m (50 ft) distant from the other

In Sight From

400

A Device, or goup of devices, or other means by which the conductors of a circuit can be disconnected from theri source of supply

Disconnecting means

500

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

Overcurrent

NEC DEFINITIONS

100

A conductor used to connect equipment equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes

Grounding conductor

200

Acceptable to the authority having jurisdiction

Approved

300

A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment is not capable, under specified test conditions, of igniting the flammable gas-air, vapor-air, or dust-air mixture

Nonincendive circuit

400

The highest current at rated voltage that a device is inteded to interrupt under standard test conditions

Interrupting rating

500

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

Overload A fault, such as a short circuit or ground fault, is not an overload.