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166 Cards in this Set
- Front
- Back
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Accessible (as applied to equipment)
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Admitting close approach; not guarded by locked doors, elevation, or other effective means.
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Accessible (as applied to wiring methods)
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Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building.
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Accessible, Readily (Readily Accessible)
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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.
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Ampacity |
The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
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Appliance
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Utilization equipment, generally other an 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.
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Approved
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Acceptable to the authority having jurisdiction
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Arc-Fault Circuit Interrupter
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A device intended to provide protection from the effect of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected.
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Askarel
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A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media.
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Attachment Plug (Plug Cap) |
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.
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Automatic
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Performing a function without the necessity of human intervention.
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Bathroom
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An area including a basin with one or more of the following: a toilet, a urinal, a tub, a shower, a bidet, or similar plumbing fixture.
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Bonded
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Connected to establish electrical continuity and conductivity
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Bonding Conductor or Jumper
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A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. |
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Bonding Jumper, Equipment
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The connection between two or more portions of the equipment grounding conductor
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Bonding Jumper, Main
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The connection between the grounded circuit conductor and the equipment grounding conductor at the service.
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Bonding Jumper, System
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The connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system.
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Branch Circuit
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The circuit conductors between the final overcurrent device protecting the circuit and the outlets.
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Branch Circuit, Appliance
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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 part of an appliance.
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Branch Circuit, General-Purpose
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A branch circuit that supplies two or more receptacles or outlets for lighting and appliances.
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Branch Circuit, Individual
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A branch circuit that supplies only one utilization equipment.
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Branch Circuit, Multiwire
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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.
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Building
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A structure that stands alone or that is cut off from adjoining structures by fire walls with all opening therein protected by approved fire doors.
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Cabinet
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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.
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Circuit Breaker
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A device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
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Adjustable (as applied to circuit breakers)
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A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range.
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Instantaneous Trip (as applied to circuit breakers)
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A qualifying term indicating that no delay is purposely introduced in the tripping action of a circuit breaker.
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Inverse Time (as applied to circuit breakers)
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A qualifying term indicating that there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.
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Nonadjustable (as applied to circuit breakers)
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A qualifying term indicating that the circuit breaker does not have any adjustment to alter the value of current at which it will trip or the time required for its operation.
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Setting (of circuit breakers)
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The value of current, time, or both, at which an adjustable circuit breaker is set to trip.
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Clothes Closet
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A non-habitable room or space intended primarily for storage of garments and apparel.
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Communications Equipment
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The electronic equipment that performs the telecommunications operations for the transmission of audio, video, and data, and includes power equipment and technical support equipment.
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Concealed |
Rendered inaccessible by the structure or finish of the building. Wires in concealed raceways are considered concealed ever though they may become accessible by withdrawing them.
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Conductor, Bare
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A conductor having no covering or electrical insulation whatsoever.
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Conductor, Covered
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A conductor encased within material of composition or thickness that is not recognized by this code as electrical insulation.
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Conductor, Insulated
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A conductor encased within material of composition and thickness that is recognized by this code as electrical insulation.
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Conduit Body |
A separate portion of a conduit or tubing system that provides access through a removable cover to the interior of the system at a junction of two or more sections of the system or at terminal point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not classified as conduit bodies.
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Connector, Pressure (Solderless)
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A device that establishes a connection between two or more conductors or between one ore more conductors and a terminal by means of mechanical pressure and without the use of solder.
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Continuous Load
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A load where the maximum current is expected to continue for 3 or more hours. |
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Controller
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A device or gorup of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected. |
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Cooking Unit, Counter-Mounted
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A cooking appliance designed for mounting in or on a counter and consisting of one or more heating elements, internal wiring, and built-in or mountable controls.
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Coordination (Selective)
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Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the choice of overcurrent protective devices and their ranges or settings.
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Copper-Clad Aluminum Conductors
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Conductors drawn from copper-clad aluminum rod with the copper metallurgically bonded to an aluminum core. The copper forms a minimum of 10% of the cross-sectional area of a solid conductor or each strand of a stranded conductor. |
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Cutout Box |
An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the box proper.
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Dead Front
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Without live parts exposed to a person on the operating side of the equipment.
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Demand Factor
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The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or part of a system under consideration.
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Device
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A unit of an electrical system that carries or controls electric energy as its principal function.
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Disconnecting Means
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A device or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
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Dusttight
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Constructed so that dust will not enter the enclosing case under specified conditions.
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Duty, Continuous
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Operation at a substantially constant load for an indefinitely long time.
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Duty, Intermittent
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Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.
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Duty, Periodic
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Intermittent operations in which the load conditions are regularly recurrent. |
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Duty, Short-Time
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Operation at a substantially constant load for a short and definite, specified time.
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Duty, Varying
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Operations at loads, and for intervals of time, both of which may be subject to wide variation.
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Dwelling One-Family
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A building that consists solely of one dwelling unit.
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Dwelling, Two-Family
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A building that consists solely of two dwelling units.
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Dwelling, Multi-Family
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A building that contains three or more dwelling units.
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Dwelling unit
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A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
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Electric Sign
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A fixed, stationary, or portable self-contained, electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention.
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Electric Power Production and Distribution Network
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Power production, distribution, and utilization equipment and facilities, such as electric utility systems that deliver electric power to the connected loads that are external to and not controlled by an interactive system.
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Enclosed
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Surrounded by a case, housing, fence or walls(s) that prevents persons from accidentally contacting energized parts.
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Enclosure
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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. |
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Energized
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Electrically connected to, or is, a source of voltage.
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Equipment
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A general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation.
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Explosionproof Equipment
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Equipment closed 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 the surrounding flammable atmosphere will not be ignited thereby.
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Exposed (as applied to live parts)
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Capable of being inadvertently touched or approached nearer than a safe distance by a person . It is applied to parts that are not suitably guarded, isolated, or insulated.
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Exposed (as applied to wiring methods)
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On or attached to the surface or behind panels designed to allow access.
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Externally Operable
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Capable of being operated without exposing the operator to live parts.
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Feeder
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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.
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Festoon Lighting
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A string of outdoor lights that is suspended between two points.
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Fitting
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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.
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Garage
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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.
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Ground
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The earth
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Ground Fault
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An unintended, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth.
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Grounded (Grounding)
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Connected to ground or to a conductive body that extends to the ground connection.
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Grounded, Solidly
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Connected to ground without inserting any resistor or impedance device.
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Grounded Conductor
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A system or circuit conductor that is intentionally grounded.
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Ground-Fault Circuit Interrupter (GFCI)
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A device intended to provide 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.
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Ground-Fault Protection of Equipment.
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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.
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Grounding Conductor, Equipment (EGC)
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The conductive path(s) installed to connect normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.
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Grounding Electrode
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A conducting object through which a direct connection to earth is established.
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Grounding Electrode Conductor
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A conductor used to connect the system grounded conductor or equipment to the grounding electrode system.
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Guarded
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Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.
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Guest Room
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An accommodation combining living, sleeping, sanitary, and storage within a compartment.
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Guest Suite
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An accommodation with two or more contiguous rooms comprising a compartment, with or without doors between such rooms, that provides living, sleeping, sanitary, and storage facilities.
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Handhole Enclosure
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An enclosure for use in underground systems, provided with an open or closed bottom, and sized to allow personnel to reach into, but not enter, for the purpose of installing, operating, or maintaining equipment or wiring or both.
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Hoistway
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Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.
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Identified (as applied to equipment)
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Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular Code requirement.
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In Sight From (Within Sight From, Within Sight)
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Where this code specifies that one equipment shall be "in sight from" "within sight from" or "within sight of" and so forth, another equipment, the specified equipment is to be visible and not more than 15m (50ft) distant from the other.
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Interactive System
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An electric power production system that is operating in parallel with and capable of delivering energy to an electric primary source supply system.
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Interrupting Rating
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The highest current at rated voltage that a device is identified to interrupt under standard test conditions.
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Intersystem Bonding Termination
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A device that provides a means for connecting bonding conductors for communication systems to the grounding electrode system.
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Isolated (as applied to location)
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Not readily accessible to persons unless special means for access are used.
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Kitchen
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An area with a sink and permanent provisions for food preparation and cooking.
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Labeled
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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 jurisdiction 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. |
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Lighting Outlet |
An outlet intended for the direct connection of a lampholder or luminaire.
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Listed
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Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with the 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.
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Live Parts
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Energized conductive components.
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Location, Damp
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Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold storage warehouses.
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Location, Dry
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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.
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Location, Wet
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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.
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Luminaire
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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 ballast or to distribute the light. A lampholder itself is not a luminaire.
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Metal-Enclosed Power Switchgear
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A switchgear assembly completely enclosed on all sides and top with sheet metal (except for ventilating opening and inspection windows) and 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. Metal-enclosed power switchgear is available in non-arc resistant or arc resistant construction.
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Motor Control Center
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An assembly of one or more enclosed sections having a common power bus and principally containing motor control circuits.
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Multioutlet Assembly
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A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.
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Neutral Conductor
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The conductor connected to the neutral point of a system that is intended to carry current under normal conditions.
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Neutral Point
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The common point on a wye-connection in a poly-phase system or midpoint on a single-phase, 3-wire system, or midpoint of a single phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system.
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Nonautomatic
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Requiring human intervention to perform a function.
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Nonlinear load
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A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.
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Outlet |
A point on the wiring system at which current is taken to supply utilization equipment.
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Outline Lighting
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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.
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Overcurrent
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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.
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Overcurrent Protective Device, Branch-Circuit
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A device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of overcurrents between its rated current and its interrupting rating. Branch circuit overcurrent protective devices are provided with interrupting ratings appropriate for the intended use but no less than 5000 amperes.
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Overcurrent Protective Device, Supplementary
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A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires and appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.
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Overload |
Operations of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when persists for a sufficient length of time, would cause damage or dangerous overheating. A fault, such as a short circuit or a ground fault, is not an overload. |
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Panelboard
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A single panel or group of panel units designed for assembly in the form of a single panel, including buss and over current 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.
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Plenum
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A compartment or chamber to which on or more air ducts are connected and that forms part of the air distribution system.
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Power Outlet
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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.
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Premesis 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 and including the 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, luminaries, motors, controllers, motor control centers, and similar equipment. |
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Qualified Person |
One who has the skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved. |
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Raceway |
An enclosed channel of metal or nonmetallic materials designed expressley for holding wires, cables, or bus-bars, with additional functions as permitted in this Code. Raceways include, but are not limited to, rigid metal conduit, rigid not non-metallic conduit, intermediate metallic conduit, liquid-tight flexible metal conduit, flexible metallic tubing, flexible metal conduit, electrical nonmettalic tubing, electrical mettalic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wire ways and busways. |
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Rainproof |
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified conditions. |
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Raintight |
Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions. |
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Receptacle |
A receptacle is a contact device installed at the outlet for the connection of an attachment plug. A single receptacle is a single contact device with no other contact device on the same yoke. A multiple receptacle is two or more devices on the same yoke. |
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Receptacle Outlet |
An outlet where one or more receptacles are installed. |
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Remote-Control Circuit |
Any electrical circuit that controls any other circuit through a relay or an equivalent device. |
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Sealable Equipment |
Equi[pment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure. The equipment may or may not be operated without opening the enclosure. |
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Separately Derived System |
A premises wiring system whose power is derived from a source of electrical energy or equipment other than the service. Such systems have no direct connection from circuit conductors of one system to circuit conductors of another system, other than connections through the earth, metal enclosures, metallic raceways, or equipment grounding conductors. |
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Service |
The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premesis served. |
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Service Cable |
Service conductors made up in the form of a cable. |
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Service Conuctors |
The conductors from the service point to the service disconnecting means. |
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Service Conductors, Overhead |
The overhead conductors between the service point and the first point of connection to the service-entrance conductors at the building or other structure. |
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Service Conductors, Underground |
The underground conductors between the service point and the first point of connection to the service-entrance conductors in a terminal box, meter, or other enclosure, inside or outside the building wall. |
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Service Drop |
The overhead conductors between the utility electric supply system and the service point. |
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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 a tap or splice to the service drop or overhead service conductors. |
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Service- Entrance Conductors, Underground System |
The service conductors between the terminals of the service equipment and to the point of connection to the service lateral or underground service conductors. |
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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. |
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Service Lateral |
The ungrounded conductors between the utility electric supply system and the service point. |
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Service Point |
The point of connection between the facilities of the serving utility and the premesis wiring. |
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Short-Circuit Current Rating |
The prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria. |
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Show Window |
Any window used or designated 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. |
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Signaling Circuit |
Any electrical circuit that energizes signaling equipment. |
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Solar Photovoltaic System |
The total components and subsystems that, in combination, convert solar energy into electric energy suitable for connection to a utilization load. |
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Special Permission |
The written consent of the authority having jurisdiction. |
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Structure |
That which is built or constructed. |
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Surge Arrestor |
A protective device for limiting surge voltages by discharging or bypassing surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions. |
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Surge-Protective Device |
A protective device for limiting transient voltages by diverting or limiting surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions. |
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Switch, Bypass 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. |
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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 it's rated current at its rated voltage. |
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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. |
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Switch, Isolating |
A switch intended for isolating an electrical circuit from the source of power. It has no interrupting rating, and is intended to be operated only after the circuit has been operated by some other means. |
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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. |
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Switch, Transfer |
An automatic or non-automatic device for transferring one or more load conductor connections from one power source to another. |
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Switchboard |
A large single panel, or frame, or assembly of panels on which are mounted on the face, back, or both, switches, over current and other protective devices, buses and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. |
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Thermal Protector (as applied to motors) |
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. |
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Thermally Proteced (as applied to motors) |
The words Thermally Protected appearing on the nameplate of a motor or motor compressor indicate that the motor is thermally protected. |
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Ungrounded |
Not connected to ground or to a conductive body that extends the ground connection. |
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Uninterruptible Power Supply |
A power supply used to provide alternating current power to a load for some period of time in the vent of a power failure. |
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Utility-Interactive Inverter |
An inverted intended for use in parallel with an electric utility to supply common loads that may deliver power to the utility. |
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Utilization Equipment |
Equipment that utilizes electric energy for electronics, electromechanical, chemical, heating, lighting, or similar purposes. |
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Ventilated |
Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors. |
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Volatile Flammable Liquid |
A flammable liquid having a flash point below 38 degrees Celsuis (100F) or a flammable liquid whose temperature is above its flashpoint, or a Class II combustible liquid that has a vapor pressure not exceeding 276kPa (40 psia) at 38 degrees Celsuis (100F) and whose temperature is above its flash point. |
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Voltage (of a circuit) |
The greatest root-mean-square (rms) (effective) difference of potential between and two conductors of the circuit concerned. |
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Voltage, Nominal |
A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class. (120/240, 480/277) The actual voltage at which a circuit operates can vary from the nominal writhing a range that permits satisfactory operation of equipment. |
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Voltage to Ground |
For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit. |
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Watertight |
Constructed so that moisture will not enter the enclosure under specified conditions. |
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Weatherproof |
Constructed or protected so that exposure to the weather will not interfere with successful operation. |
