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Ampacity - The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Appliance - Utilization equipment, generally other than industrial, that is normally built in standardized sizes or types and is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, and so forth. Approved - Acceptable to the authority having jurisdiction. Askarel - A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Attachment Plug (Plug Cap) (Plug) - A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle. Authority Having Jurisdictions (AHJ) - The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure Automatic - Self acting, operating by its own mechanism when actuated by some impersonal influence. Bathroom - Area including tub, toilet, shower Bonding (Bonded) - 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 Jumper - A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. Bonding Jumper, Main - The connection between the grounded circuit conductor and the equipment grounding conductor at the service. Bonding Jumper, Equipment - The connection between two or more portions of the equipment grounding conductor. Bonding Jumper, System - The connection between the grounded circuit conductor and the equipment grounding conductor at a separately derived system. Branch Circuit - The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
Branch Circuit, Appliance - A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not a part of an appliance. Branch Circuit, General-Purpose - A branch circuit that supplies two or more receptacles or outlets for lighting and appliances. Branch Circuit, Individual - A branch circuit that supplies only one utilization equipment. Branch circuit, multi wire - A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system Building - A structure that stands alone or that is cut off from adjoining structures by fire walls with all openings therein protected by approved fire doors. Cabinet - An enclosure that is designed for either surface mounting or flush mounting and is provided with a frame, mat, or trim in which a swinging door or doors are or can be hung Circuit breaker - 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 within its rating. Concealed - Rendered inaccessible by the structure or finish of the building. Conductor, Bare - A conductor having no covering or electrical insulation whatsoever. Conductor, Covered - A conductor encased within material of composition or thickness that is not recognized by this Code as electrical insulation. Conductor, insulated - A conductor encased within material of composition and thickness that is recognized by this Code as electrical insulation. Conduit Body - A separate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more sections of the system or at a terminal point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not classified as conduit bodies. Connector, pressure (solderless) - A device that establishes a connection between two or more conductors or between one or more conductors and a terminal by means of mechanical pressure and without the use of solder.
Duty, Short-Time - Operation at a substantially constant load for a short and definite, specified time. Duty, Varying - Operation at loads, and for intervals of time, both of which may be subject to wide variation. Dwelling Unit - A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation. Dwelling, One-Family - A building that consists solely of one dwelling unit. Dwelling, Two-Family - A building that consists solely of two dwelling units. Dwelling, Multifamily - A building that contains three or more dwelling units. Electric sign - A fixed, stationary, or portable self-contained, electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention. Enclosed - Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts. Enclosure - The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage. Energized - Electrically connected to, or is, a source of voltage. Equipment - A general term including materials, fittings, devices, appliances, luminaries(fixtures), apparatus, and the like used as a part of, or in connection with, an electrical installation Explosion proof Apparatus - Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby. Exposed (as applied to live parts) - Capable of being inadvertently touched or approached nearer than a safe distance by a person. Exposed (as applied to wiring methods) - On or attached to the surface or behind panels designed to allow access.
Externally Operable - Capable of being operated without exposing the operator to contact with live parts. Feeder - All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device. Festoon lightning - A string of outdoor lights that is suspended between two points Fitting - An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function. Garage - A building or portion of a building in which one or more self-propelled vehicles can be kept for use, sale, storage, rental, repair, exhibition, or demonstration purposes. Ground - A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and earth or to some conducting body that serves in place of the earth. Grounded - Connected to earth or to some conducting body that serves in place of the earth. Grounded, Effectively - Intentionally connected to earth through a ground connection or connections of sufficiently low impedance and having sufficient current-carrying capacity to prevent the buildup of voltages that may result in undue hazards to connected equipment or to persons. Grounded, Solidly - Connected to ground without inserting any resistor or impedance device. Grounded Conductor - A system or circuit conductor that is intentionally grounded. Ground Fault Circuit Interrupter (GFCI) - A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device. Ground-Fault Protection of Equipment - A system intended to provide protection of equipment from damaging line-to-ground fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit. This protection is provided at current levels less than those required to protect conductors from damage through the operation of a supply circuit overcurrent device. Grounding Conductor - A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes
and concerned with product evaluation, 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. Lighting Outlet - An outlet intended for the direct connection of a lampholder or luminaire. listed - 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 either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose. Live parts - Energized conductive components. Location, damp - Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Location, dry - A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction. Location, Wet - Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather. Luminaire - A complete lighting unit consisting of a light source such as a lamp or lamps, together with the parts designed to position the light source and connect it to the power supply. It may also include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not a luminaire. Metal-Enclosed Power Switchgear - A switchgear assembly completely enclosed on all sides and top with sheet metal (except for ventilating openings and inspection windows) containing primary power circuit switching, interrupting devices, or both, with buses and connections. The assembly may include control and auxiliary devices. Access to the interior of the enclosure is provided by doors, removable covers, or both. Motor Control Center - An assembly of one or more enclosed sections having a common power bus and principally containing motor control units. Multioutlet Assembly - A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.
Nonautomatic - Action requiring personal intervention for its control. As applied to an electric controller, nonautomatic control does not necessarily imply a manual controller, but only that personal intervention is necessary. Nonlinear load - A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage. outlet - A point on the wiring system at which current is taken to supply utilization equipment. Outline Lighting - An arrangement of incandescent lamps, electric-discharge lighting, or other electrically powered light sources to outline or call attention to certain features such as the shape of a building or the decoration of a window. Overcurrent - 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. Overload - 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. A fault, such as a short circuit or ground fault, is not an overload. Panelboard - 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; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front. Plenum - A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system. power outlet - An enclosed assembly that may include receptacles, circuit breakers, fuseholders, fused switches, buses, and watt-hour meter mounting means; intended to supply and control power to mobile homes, recreational vehicles, park trailers, or boats or to serve as a means for distributing power required to operate mobile or temporarily installed equipment. Premises Wiring (System) - Interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed. This includes (a) wiring from the service point or power source to the outlets or (b) wiring from and including the power source to the outlets where there is no service point. Such wiring does not include wiring internal to appliances, luminaires, motors, controllers, motor control centers, and similar equipment.
Service-Entrance Conductors, Overhead System - The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors. Service-Entrance Conductors, underground system - The service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors. Service Equipment - The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply. Service Lateral - The underground service conductors between the street main, including any risers at a pole or other structure or from transformers, and the first point of connection to the service-entrance conductors in a terminal box or meter or other enclosure, inside or outside the building wall. Where there is no terminal box, meter, or other enclosure, the point of connection is considered to be the point of entrance of the service conductors into the building Service Point - The point of connection between the facilities of the serving utility and the premises wiring. show window - Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level. Signal circuit - Any electric circuit that energizes signaling equipment Solar photovoltaic system - The total components and subsystems that, in combination, convert solar energy into electrical energy suitable for connection to a utilization load. Special Permission - The written consent of the authority having jurisdiction. Structure - Built or constructed Supplementary Overcurrent Protective Device - A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires (lighting fixtures) and appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.
Switch, Bass Isolation - A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch Switch, General-Use - A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage. Switch, General-Use Snap - A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this Code. Switch, Isolating - 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. Switch, Motor-Circuit - A switch rated in 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. switch, transfer - An automatic or nonautomatic device for transferring one or more load conductor connections from one power source to another. switchboard - A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. These assemblies are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. Thermally Protected (as applied to motors) - The words Thermally Protected appearing on the nameplate of a motor or motor-compressor indicate that the motor is provided with a thermal protector. Thermal protector - 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 Utilization Equipment - Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. Ventilated - Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors. Volatile Flammable Liquid - A flammable liquid having a flash point below 38°C (100°F), or a flammable liquid whose temperature is above its flash point, or a Class II combustible liquid that has a vapor pressure not exceeding 276 kPa (40 psia) at 38°C (100°F) and whose temperature is above its flash point.
Service Drop - The overhead service conductors from the last pole or other aerial support to and including splices, if any, connecting to the service entrance conductors at the building. Service-Entrance Conductors, Overhead System - The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors. Service-Entrance Conductors, underground system - The service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors. Service Equipment - The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply. Service Lateral - The underground service conductors between the street main, including any risers at a pole or other structure or from transformers, and the first point of connection to the service-entrance conductors in a terminal box or meter or other enclosure, inside or outside the building wall. Where there is no terminal box, meter, or other enclosure, the point of connection is considered to be the point of entrance of the service conductors into the building Service Point - The point of connection between the facilities of the serving utility and the premises wiring. show window - Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level. Signal circuit - Any electric circuit that energizes signaling equipment Solar photovoltaic system - The total components and subsystems that, in combination, convert solar energy into electrical energy suitable for connection to a utilization load. Special Permission - The written consent of the authority having jurisdiction. Structure - Built or constructed Supplementary Overcurrent Protective Device - A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires (lighting fixtures) and appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.
Switch, Bass Isolation - A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch Switch, General-Use - A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage. Switch, General-Use Snap - A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this Code. Switch, Isolating - 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. Switch, Motor-Circuit - A switch rated in 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. switch, transfer - An automatic or nonautomatic device for transferring one or more load conductor connections from one power source to another. switchboard - A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. These assemblies are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. Thermally Protected (as applied to motors) - The words Thermally Protected appearing on the nameplate of a motor or motor-compressor indicate that the motor is provided with a thermal protector. Thermal protector - 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 Utilization Equipment - Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. Ventilated - Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors. Volatile Flammable Liquid - A flammable liquid having a flash point below 38°C (100°F), or a flammable liquid whose temperature is above its flash point, or a Class II
