Definition of terms Flashcards
Admitting close approach; not guarded by locked doors, elevation, or other effective means.
Accessible (as applied to equipment)
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.
Accessible (as applied to wiring methods)
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 (Readily Accessible)
The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
Ampacity
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.
Appliance
Acceptable to the authority having jurisdiction.
Approved
A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Askarels of various compositional types are used. Under arcing conditions, the gases produced, while consisting predominantly of noncombustible hydrogen chloride, can include varying amounts of combustible gases, depending on the askarel type.
Askarel
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.
Attachment Plug (Plug Cap) (Plug)
The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure
Authority Having Jurisdiction (AHJ)
Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current, pressure, temperature, or mechanical configuration.
Automatic
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 (Bonded)
A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.
Bonding Jumper
a set of conductors that extends beyond the last overcurrent device protecting the circuit and the outlet(s).
Branch Circuit
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
Circuit Breaker
Indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range.
Adjustable
- No delay is purposely introduced in the tripping action of the circuit breaker.
Instantaneous Trip
There is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.
Inverse Time
It does not have any adjustment to alter the value of current at which it will trip or the time required for its operation.
Nonadjustable
The value of current, time, or both, at which an adjustable circuit breaker is set to trip.
Setting
Rendered inaccessible by the structure or finish of the building. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them
Concealed
A conductor having no covering or electrical insulation whatsoever.
Conductor, Bare
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 included.
Conduit Body
- 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.
Connector, Pressure (Solderless)
A load where the maximum current is expected to continue for 3 hours or more.
Continuous Load
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
Conductors drawn from a copper-clad aluminum rod with the copper metallurgically bonded to an aluminum core. The copper forms a minimum of 10 percent of the cross- sectional area of a solid conductor or each strand of a stranded conductor.
Copper-Clad Aluminum Conductors
An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the box proper
Cutout Box
Without live parts exposed to a person on the operating side of the equipment.
Dead Front
The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration.
Demand Factor
A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
Disconnecting Means
Constructed so that dust will not enter the enclosing case under specified test conditions.
Dusttight
Operation at a substantially constant load for an indefinitely long time.
Continuous Duty
Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.
Intermittent Duty
- Intermittent operation in which the load conditions are regularly recurrent.
Periodic Duty
Operation at a substantially constant load for a short and definite, specified time.
Short-Time Duty
Operation at loads, and for intervals of time, may be subject to wide variation.
Varying Duty
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts
Enclosed
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.
Enclosure
Electrically connected to a source of voltage.
Energized
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.
Exposed (as applied to live parts)
On or attached to the surface or behind panels designed to allow access.
Exposed (as applied to wiring methods)
- 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.
Feeder
A string of outdoor lights that is suspended between two points.
Festoon Lighting
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
Fitting
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 Circuit Interrupter (GFCI)
A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes.
Grounding Conductor
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 conductor, or both, at the service equipment or at the source of a separately derived system.
Equipment Grounding Conductor
A device that establishes an electrical connection to the earth.
Grounding Electrode
The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded conductor, or to both, at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at the source of a separately derived system.
Grounding Electrode Conductor
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.
Guarded
An enclosure identified 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.
Handhole Enclosure
- Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.
Hoistway
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 15 m (50 ft) distant from the other.
In Sight From (Within Sight From, Within Sight)
The highest current at rated voltage that a device is intended to interrupt under standard test conditions.
Interrupting Rating
Conductor or conductive part intended to be energized in normal use.
Live Parts
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.
Damp Location
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.
Dry Location
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.
Wet Location
A complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and ballast (where applicable), and to connect the lamps to the power supply
Luminaire
A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.
Multioutlet Assembly
Action requiring personal intervention for its control. As applied to an electric controller, non-automatic control does not necessarily imply a manual controller, but only that personal intervention is necessary.
Non-automatic
A point on the wiring system at which current is taken to supply utilization equipment.
Outlet
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
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.
Overload
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.
Panelboard
A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system.
Plenum
An enclosed assembly that may include receptacles, circuit breakers, fuse holders, 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
Power Outlet
An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code. Raceways include, but are not limited to, RMC, RNMC, IMC, LFC, FMT, FMC, ENMT, EMT, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.
Raceway
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions.
Rainproof
Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions.
Raintight
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 contact devices on the same yoke.
Receptacle
An outlet where one or more receptacles are installed.
Receptacle Outlet
The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.
Service
Service conductors made up in the form of a cable.
Service Cable
The conductors from the service point to the service disconnecting means
Service Conductors
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.
Service Drop
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.
Service-Entrance Conductors, Overhead System
The service conductors between the terminals of the service equipment and the point of connection to the service lateral.
Service-Entrance Conductors, Underground System
- 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 Equipment
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 Lateral
The point of connection between the facilities of the serving utility and the premises wiring
Service Point -
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.
Show Window
Any electric circuit that energizes signaling equipment.
Signaling Circuit
- An automatic or non-automatic device for transferring one or more load conductor connections from one power source to another.
Transfer Switch
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. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets
Switchboard
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 (as applied to motors)
Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes.
Utilization Equipment
A flammable liquid having a flash point below 38°C, 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 at 38°C and whose temperature is above its flash point.
Volatile Flammable Liquid
The greatest root-mean-square (RMS/effective) difference of potential between any two conductors of the circuit concerned.
Voltage (of a circuit)
A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment.
Nominal Voltage
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.
Voltage to Ground
Constructed so that moisture will not enter the enclosure under specified test conditions
Watertight
Constructed or protected so that exposure to the weather will not interfere with successful operation
Weatherproof
The service conductors between the terminal of the service equipment and point usually outside the building, clear of building walls, where joined by a taps or splices to the service drop. A building or other structure served be supplied by one service only
Service Entrance
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 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 Lateral
A device that, when interrupting currents in its current-limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance.
Current-Limiting Overcurrent Protective Device
A conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected.
Tap Conductor
An intentionally constructed, permanent, low-impedance electrically conductive path designed and intended to carry current underground-fault conditions from the point of a ground fault on a wiring system to the electrical supply source and that facilitates the operation of the overcurrent protective device or ground fault detectors on high-impedance grounded systems.
Effective Ground-Fault Current Path
An unintentional, 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.
Ground Fault
An electrically conductive path from the point of a ground fault on a wiring system through normally non-current carrying conductors, equipment, or the earth to the electrical supply source.
Ground-Fault Current Path
connects the equipment grounding conductors, the service- equipment enclosures to the grounding electrode(s)
Grounding Electrode Conductor
Any metal underground water pipe 3000 mm or more and electrically continuous to the points of connection of the grounding electrode conductor and the bonding conductors.
Metal Underground Water Pipe
3000 mm or more of a single structure metal member in direct contact with earth or encased in concrete that is in direct contact with the earth.
Metal Frame of the Building
An electrode encased by at least 50 mm of concrete located near the bottom of concrete foundation or footing. It has 6000 mm of one or more electrically conductive steel coated bars.
Concrete Encased Electrode
Bare copper conductor not smaller than 30 mm2 encircling the building/structure. 6000 mm or more in length and buried at a depth not less than 750 mm
Ground Ring
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.
Surge Arrester
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.
Transient Voltage Surge Suppressor (TVSS)
A complete system of air terminals, conductors, ground terminals, interconnecting conductors, arresters, and other connectors or fittings required to complete the system.
Lighting Protection System
Generic terms for the component parts.
Rods and Points
Capable to drawing lighting discharge to it in preference to vulnerable parts of the protected area. It may consist of a pointed, solid, or tubular rod or one with special design and material provided with a mounting base having a proper conductor connection.
Air Terminal
All conductors, fittings, and fixture for protection not exceeding 23 m in height.
Class I Materials
All conductors, fittings and fixtures for protection exceeding 23 m in height; or one which has a structural steel frame, of any height.
Class II Materials
Steel with a coating of copper to bond it
Copper-Clad Steel
A conductor encircling a building and inter-connecting all ground terminals
Counterpoise (ground)
An attachment to secure the conductor to the structure
Fastener
Self-closing gage hatches, vapor seals, pressure-vacuum breather valves, flame arresters, or other reasonably effective means to minimize the possibility of flame entering the vapor space of a tank.
Flame Protection
The vapors given from a flammable liquid at or above its flash point.
Flammable Vapors
The minimum temperature at which it gives off vapor in sufficient concentration to form an ignitable mixture with air near the surface of the liquid within the vessel.
Flash Point
A building over 23m in height.
High-Rise Building
Metal objects at the flat roof level subject to direct lighting stroke.
Metal Body of Conductance
Metal objects located 2000 mm of a conductor subject to buildup of potential.
Metal Body of Inductance
Building with either sides or roof made of or covered with sheet metal.
Metal-Clad Building
Building with electrically continuous framing of sufficient size and conductivity.
Metal-Framed Building
A spark between nearby metallic objects to lighting protection system or to ground.
Sideflash
Any short air space between two conductors electrically insulated to each other.
Spark Gap
A smoke/vent stack with greater than 0.32 m2 and the height is greater than 23 m.
Stack, Heavy-Duty
Openings for tank breathing, tank gaging, and fire fighting.
Vapor Openings
Provided by a grounded air terminal or mast or overhead ground wire which is immune to direct strokes of lighting.
Zone of Protection
A fabricated assembly of insulated conductors in a flexible metallic enclosure.
Armored Cable
A factory assembly of one or more conductors, each individually insulated and enclosed in a loose fit, nonmetallic flexible conduit as an integrated gas spacer cable rated 0 through 600V
Integrated Gas Spacer (IGS)
A run Type IGS shall not contain more than equivalent of four quarter bends. (360 bends)
bends
The terminations and splices shall be suitable for maintaining gas pressure within the conduit. Valve and cap shall be provided to check the gas pressure or to inject gas into the conduit
Fittings
Solid aluminum rods, lay parallel, consisting of 1 to 19 (13 mm diam. rods). The minimum size conductor size shall be 125 mm2, and the maximum size shall be 2375 mm2. (4750 kcmil)
Conductors
Shall be dry kraft paper tapes and a pressurized sulfur hexafluoride (SF6). The nominal gas pressure shall be 138 kPA gauge.
Insulation
The conduit shall be a medium density polyethylene identified as suitable for use with natural gas rated pipe in race size 50 mm, 80 mm, or 100 mm.
Conduit
An assembly of parallel conductors formed integrally with an insulating material web specifically for field installation in surface metal raceway
Flat Cable Assemblies
3 or more flat copper conductors placed edge-to-edge and separated and enclosed within an insulating assembly.
Flat Conductor Cable
The protective layer installed between the floor and Type FCC for protection
Bottom Shield
A grounded metal shield covering under-carpet components.
Top Shield
Connector designed to join Type FCC without using a junction box.
Cable Connector
Complete wiring system for branch circuits design for installation under carpet squares.
FCC System
Insulator designed to electrically insulate the end of Type FCC.
Insulating End
Means of connection designed to electrically and mechanically connect a metal shield to another metal.
Metal Shield Connections
Incorporated with electrical connection and a suitable box or covering for safety.
Transition Assembly
A single conductor or multiconductor assembly provided with or without an overall covering, primarily used for services, and of the following types:
Service-Entrance Cable
Cable with flame-retardant, moisture-resistant covering.
Type SE
Cable identified for underground use, having a moisture-resistant covering, but not required to have a flame-retardant covering.
Type USE
The radius of the curve of the inner edge shall not be less than 5 times the diameter of the cable.
Bending Radius
A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape or a smooth or corrugated metallic sheath.
Metal Clad Cable
A factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath.
Mineral Insulated, Metal-Sheathed Cable
A factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a nonmetallic jacket.
Power and Control Tray Cable
A factory assembly of two or more insulated conductors enclosed within an overall nonmetallic jacket.
Nonmetallic-Sheathed Cable
Insulated conductors enclosed within an overall nonmetallic jacket.
Type NM
Insulated conductors enclosed within an overall, corrosion resistant, nonmetallic jacket.
Type NMC
Insulated power or control conductors with signaling, data, and communications conductors within an overall nonmetallic jacket.
Type NMS
A factory assembly of one or more insulated conductors with an integral or an overall covering of nonmetallic material suitable for direct burial in the earth
Underground Feeder and Branch-Circuit
A steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings.
Intermediate Metal Conduit
A threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings. RMC is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous). Special use types are silicon bronze and stainless steel.
Rigid Metal Conduit
A nonmetallic raceway of circular cross section, with integral or associated couplings, connectors, and fittings for the installation of electrical conductors and cables.
Rigid Nonmetallic Conduit
A raceway of circular cross section made of helically wound, formed, interlocked metal strip.
Flexible Metal Conduit
A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors.
Liquidtight Flexible Metal Conduit
A nonmetallic raceway of circular cross section, with associated couplings, connectors, and fittings for the installation of electrical conductors.
High Density Polyethylene Conduit
A factory assembly of conductors/cables inside a nonmetallic, smooth wall conduit.
Nonmetallic Underground Conduit with Conductors
A smooth seamless inner core and cover bonded together and having one or more reinforcement layers between the core and covers.
Type LFNC-A
A smooth inner surface with integral reinforcement within the conduit wall.
Type LFNC-B
A corrugated internal & external surface without integral reinforcement within the conduit.
Type LFNC-C
An unthreaded thin wall raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed utilizing appropriate fittings. EMT is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous).
Electrical Metallic Tubing
A raceway that is circular in cross section, flexible, metallic, and liquidtight without a nonmetallic jacket
Flexible Metallic Tubing
A nonmetallic pliable corrugated raceway of circular cross section with integral or associated couplings, connectors, and fittings for the installation of electric conductors. ENT is composed of a material that is resistant to moisture and chemical atmospheres and is flame retardant.
A pliable raceway can be bent by hand with a reasonable force but without other assistance
Electrical Nonmetallic Tubing
Sheet metal enclosures with hinged or removable covers for housing and protecting electric wires, cable, and busbars in which conductors are laid in place after the wireway.
Metallic Auxiliary Gutters
Flame retardant, nonmetallic enclosures with removable covers for housing and protecting electric wires, cable, and busbars in which conductors are laid in place after the wireway.
Nonmetallic Auxiliary Gutters
A grounded metal enclosure containing factory-mounted, bare or insulated conductors, which are usually a copper or aluminum bars, rods, or tubes.
Busways
An assembly of insulated conductors with fittings and conductor terminations in a completely enclosed ventilated protective metal housing.
Cablebus
The hollow spaces of cellular metal floors, together with suitable fittings, that may be approved as enclosures for electric conductors.
Cellular Metal Floor Raceway
A single, enclosed tubular space in a floor made of precast cellular concrete slabs or metal, the direction of the cell being parallel to the direction of the floor member.
Cell
Transverse metal raceways for conductors, providing access to predetermined cells of a precast cellular concrete floor.
Header
Sheet metal troughs with hinged or removable covers for housing and protecting electric wires and cable and in which conductors are laid in place after the wireway.
Metal Wireways
Flame retardant, nonmetallic troughs with removable covers for housing and protecting electric wires and cables in which conductors are laid in place after the wireway.
Nonmetallic Wireways
A wiring method using knobs, tubes, and flexible nonmetallic tubing for the protection and support of single insulated conductors.
Concealed Knob-and-Tube Wiring
A metallic raceway mounted to the surface of or suspended from a structure, with associated accessories for the installation of electrical conductors and cables
STRUT-TYPE CHANNEL RACEWAY
A raceway that is intended to be mounted to the surface of a structure, with associated couplings, connectors, boxes, and fittings for the installation of electrical conductors.
SURFACE RACEWAYS (METAL AND NON METAL)
An exposed wiring support system using a messenger wire to support insulated conductors.
MESSENGER SUPPORTED WIRING
A grounded metal shield covering under-carpet components.
Top Shield
Connector designed to join Type FCC without using a junction box.
Cable Connector
Complete wiring system for branch circuits design for installation under carpet squares.
FCC System
Insulator designed to electrically insulate the end of Type FCC.
Insulating End
Means of connection designed to electrically and mechanically connect a metal shield to another metal.
Metal Shield Connections
Incorporated with electrical connection and a suitable box or covering for safety.
Transition Assembly
A single conductor or multiconductor assembly provided with or without an overall covering, primarily used for services, and of the following types:
Service-Entrance Cable
Cable with flame-retardant, moisture-resistant covering.
Type SE
Cable identified for underground use, having a moisture-resistant covering, but not required to have a flame-retardant covering.
Type USE
The radius of the curve of the inner edge shall not be less than 5 times the diameter of the cable.
Bending Radius
A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape or a smooth or corrugated metallic sheath.
Metal Clad Cable
A factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath.
Mineral Insulated, Metal-Sheathed Cable
A factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a nonmetallic jacket.
Power and Control Tray Cable
A factory assembly of two or more insulated conductors enclosed within an overall nonmetallic jacket.
Nonmetallic-Sheathed Cable
Insulated conductors enclosed within an overall nonmetallic jacket.
Type NM
Insulated conductors enclosed within an overall, corrosion resistant, nonmetallic jacket.
Type NMC
Insulated power or control conductors with signaling, data, and communications conductors within an overall nonmetallic jacket.
Type NMS
A factory assembly of one or more insulated conductors with an integral or an overall covering of nonmetallic material suitable for direct burial in the earth
Underground Feeder and Branch-Circuit
Equipment having electrical/electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas-air, vapor-air, or dust-air mixture due to arcing or thermal means.
Nonincendive Equipment
A threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings. RMC is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous). Special use types are silicon bronze and stainless steel.
Rigid Metal Conduit
A nonmetallic raceway of circular cross section, with integral or associated couplings, connectors, and fittings for the installation of electrical conductors and cables.
Rigid Nonmetallic Conduit
A raceway of circular cross section made of helically wound, formed, interlocked metal strip.
Flexible Metal Conduit
A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors.
Liquidtight Flexible Metal Conduit
A nonmetallic raceway of circular cross section, with associated couplings, connectors, and fittings for the installation of electrical conductors.
High Density Polyethylene Conduit
A factory assembly of conductors/cables inside a nonmetallic, smooth wall conduit.
Nonmetallic Underground Conduit with Conductors
A smooth seamless inner core and cover bonded together and having one or more reinforcement layers between the core and covers.
Type LFNC-A
A smooth inner surface with integral reinforcement within the conduit wall.
Type LFNC-B
A corrugated internal & external surface without integral reinforcement within the conduit.
Type LFNC-C
An unthreaded thin wall raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed utilizing appropriate fittings. EMT is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous).
Electrical Metallic Tubing
A raceway that is circular in cross section, flexible, metallic, and liquidtight without a nonmetallic jacket
Flexible Metallic Tubing
A nonmetallic pliable corrugated raceway of circular cross section with integral or associated couplings, connectors, and fittings for the installation of electric conductors. ENT is composed of a material that is resistant to moisture and chemical atmospheres and is flame retardant.
A pliable raceway can be bent by hand with a reasonable force but without other assistance
Electrical Nonmetallic Tubing
Sheet metal enclosures with hinged or removable covers for housing and protecting electric wires, cable, and busbars in which conductors are laid in place after the wireway.
Metallic Auxiliary Gutters
Flame retardant, nonmetallic enclosures with removable covers for housing and protecting electric wires, cable, and busbars in which conductors are laid in place after the wireway.
Nonmetallic Auxiliary Gutters
A grounded metal enclosure containing factory-mounted, bare or insulated conductors, which are usually a copper or aluminum bars, rods, or tubes.
Busways
An assembly of insulated conductors with fittings and conductor terminations in a completely enclosed ventilated protective metal housing.
Cablebus
The hollow spaces of cellular metal floors, together with suitable fittings, that may be approved as enclosures for electric conductors.
Cellular Metal Floor Raceway
A single, enclosed tubular space in a floor made of precast cellular concrete slabs or metal, the direction of the cell being parallel to the direction of the floor member.
Cell
Transverse metal raceways for conductors, providing access to predetermined cells of a precast cellular concrete floor.
Header
Sheet metal troughs with hinged or removable covers for housing and protecting electric wires and cable and in which conductors are laid in place after the wireway.
Metal Wireways
Flame retardant, nonmetallic troughs with removable covers for housing and protecting electric wires and cables in which conductors are laid in place after the wireway.
Nonmetallic Wireways
A wiring method using knobs, tubes, and flexible nonmetallic tubing for the protection and support of single insulated conductors.
Concealed Knob-and-Tube Wiring
A metallic raceway mounted to the surface of or suspended from a structure, with associated accessories for the installation of electrical conductors and cables
STRUT-TYPE CHANNEL RACEWAY
A raceway that is intended to be mounted to the surface of a structure, with associated couplings, connectors, boxes, and fittings for the installation of electrical conductors.
SURFACE RACEWAYS (METAL AND NON METAL)
An exposed wiring support system using a messenger wire to support insulated conductors.
MESSENGER SUPPORTED WIRING
An assembly of a systematic and standard arrangement of two or more components such as motor controllers, overload relays, fused disconnect switches, and circuit breakers and related control devices such as pushbutton stations, selector switches, timers, switches, control relays, and the like with associated wiring, terminal blocks, pilot lights, and similar components. The industrial control panel does not include the controlled equipment.
Minimum Size and Ampacity
Industry Control Panel
A manufactured assembly designed to support and energize luminaires (lighting fixtures) that are capable of being readily repositioned on the track. Its length can be altered by the addition or subtraction of sections of track.
Lighting Track
A combination of the power converter, motor, and motor mounted auxiliary devices (encoders, tachometers, thermal switches and detectors, air blowers, heaters, and vibration sensors).
Adjustable Speed Drive
The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.
Motor Control Circuit
A redundantly monitored, remotely operated contactor-isolating system, packaged to provide the disconnection/isolation function, capable of verifiable operation from multiple remote locations by means of lockout switches, each having the capability of being padlocked in the ―off‖ (open) position.
System Isolation Equipment
An overload device that can restart a motor automatically after overload tripping shall not be installed unless approved if automatic restarting may result in injury to persons
Automatic Restarting
Consist of a compressor and motor, both of which are enclosed in the same housing, with no external shaft or shaft seals the motor operating in the refrigerant.
Hermetic Refrigerant Motor-Compressor
A device provided in a power supply cord or cord set that senses leakage current flowing between or from the cord conductors and interrupts the circuit at a predetermined level of leakage current.
Leakage Current Detection and Interruption (LCDI) Protection
Apparatus in which the circuits are not necessarily nonincendive themselves but that affects the energy in nonincendive field wiring circuits and is relied upon to maintain nonincendive energy levels.
Associated Nonincendive Field Wiring Apparatus
A protection technique utilizing stationary gas detectors
Combustible Gas Detection System
Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure.
Dust-Ignitionproof
Enclosures constructed so that dust will not enter under specified test conditions.
Dusttight
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.
Explosionproof Apparatus
sealed against the entrance of an external atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.
Hermetically Sealed Equipment
Electrical equipment immersed in a protective liquid in such a way that an explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.
Oil Immersion
supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas/vapor initially present to an acceptable level.
Purging
supplying an enclosure with a protective gas with or without continuous flow at sufficient pressure to prevent flammable gas/vapor, a combustible dust, or an ignitable fiber to enter.
Pressurization
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
Equipment having electrical/electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas-air, vapor-air, or dust-air mixture due to arcing or thermal means.
Nonincendive Equipment
Flammable gases or vapor are present in air which is sufficient to produce explosive or ignitable mixtures.
CLASS I LOCATIONS
Locations that has presence of combustible dust.
CLASS II LOCATIONS
Locations that has the presence of ignitable fibers or flyings.
CLASS III LOCATIONS
One or more generator sets, or batter systems where permitted, intended to provide power during the interruption of the normal electrical services or the public utility electrical service intended to provide power during interruption of service normally provided by the generating facilities on the premises.
Alternate Power Source
A building or part thereof used to provide services or treatment to four or more patients at the same time.
Ambulatory Health Care Facility
A subsystem of the emergency system consisting of feeders and branch circuits supplying energy to task illumination, special power circuits, and selected receptacles serving areas and functions related to patient care, and which are connected to alternate power sources by one or more transfer switches during interruption of the normal power source.
Critical Branch
Electrically powered equipment whose continuous operation is necessary to maintain a patient’s life.
Electrical Life-Support Equipment
A system of circuits and equipment intended to supply alternate power to a limited number of prescribed functions vital to the protection of life and safety.
Emergency System
Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care are provided. Health care facilities include, but are not limited to, hospitals, nursing homes, limited care facilities, clinics, medical and dental offices, and ambulatory care centers, whether permanent or movable.
Health Care Facilities
A building or part thereof used for the medical, psychiatric, obstetrical, or surgical care, on a 24-hour basis, of four or more inpatients. Hospital shall include general hospitals, mental hospitals, tuberculosis hospitals, children’s hospitals, and any such facilities providing inpatient care.
Hospital
A transformer of the multiple-winding type, with the primary and secondary windings physically separated, which inductively couples its secondary winding to the grounded feeder systems that energize its primary winding.
Isolation Transformer
n an area in which patients are normally cared for, the patient vicinity is the space with surfaces likely to be contacted by the patient or an attendant who can touch the patient. Typically in a patient room, this encloses a space within the room not less than 1800 mm beyond the perimeter of the bed in its nominal location, and extending vertically not less than 2300 mm above the floor.
Patient Vicinity
Occupancy of any room or space for assembly of 100 persons or more.
Multiple Occupancies
These are any such building structure or portion thereof, contains a projection booth or stage platform or area for the presentation of theatrical or musical productions.
Theatrical Areas
Flexible cables and cords approved for hard or extra-hard usage shall be permitted to be laid on floors where protected from contact by the general public
Temporary Wiring
The fixed wiring methods shall be metal raceways, flexible metal raceways, nonmetallic raceways encased in not less than 50 mm of concrete, Type MI, MC, or AC cable with an insulated EGC.
Wiring in General
A permanently installed overhead strip light.
Border Light
An adapter used to connect a multipole connector containing two or more branch circuits to multiple individual branch-circuit connectors.
Breakout Assembly
Cables/conductors that are physically tied, wrapped, taped or periodically bound together.
Bundled
A metal wireway containing pendant or flush receptacles.
Connector Strip
A box containing pendant or flush-mounted receptacles attached to a multiconductor cable via strain relief or a multipole connector.
Drop Box
A border light installed on or in the stage.
Footlight
Cables or conductors adjacent to one another but not in continuous contact with each other.
Grouped
The stage and audience seating area associated with a temporary stage structure, whether indoors or outdoors, constructed of scaffolding, truss, platforms, or similar devices, that is used for the presentation of theatrical or musical productions or for public presentations.
Performance Area
fed with portable cords/cables intended to be moved from a place to another.
Portable Equipment
A power distribution box with receptacles and overcurrent devices.
Portable Power Distribution Unit
The wall and arch that separates the stage from the auditorium (house).
Proscenium
A portable stand that contains a general-purpose luminaire or lampholder with guard for the purpose of providing general illumination on the stage or in the auditorium.
Stand Lamp (Work Light)
A luminaire (lighting fixture) with multiple lamps arranged in a row.
Strip Light
An adapter cable containing one male plug and two female cord connectors used to connect two loads to one branch circuit.
Two-Fer
Contains 1/more grounding-type polarized receptacles that may contain overcurrent protection devices.
Alternating-Current Power Distribution Box (Alternating-Current Plugging Box, Scatter Box)
An externally operated wall-mounted safety switch that may or may not contain overcurrent protection and is designed for the connection of portable cables and cords.
Bull Switch
Portable equipment containing a lighting contactor or contactors and overcurrent protection designed for remote control of stage lighting.
Location Board (Deuce Board)
A dc device consisting of one or more 2-pole, 2-wire, nonpolarized, nongrounding-type receptacles intended to be used on dc circuits only
Plugging Box
A device that is installed at the ends of portable, flexible, single conductor cable that is used to establish connection or disconnection between two cables or one cable and a single-pole, panel-mounted separable connector.
Single-Pole Separable Connector
A device that contains busbars that are insulated from each other for the purpose of splicing or distributing power to portable cables and cords that are terminated with single- pole busbar connectors.
Spider (Cable Splicing Block)
A type of projector using 35- or 70-mm film that has a minimum width of 35 mm and has on each edge 212 perforations per meter, or a type using carbon arc, xenon, or other light source equipment that develops hazardous gases, dust, or radiation.
Professional Projector
A structure, transportable in one or more sections, that is 2400 mm or more in width or 12 m or more in length in the traveling mode or, when erected on site, is 30 m2 or more; which is built on a chassis and designed to be used as a dwelling, with or without a permanent foundation, when connected to the required utilities, including the plumbing, heating, air conditioning, and electrical systems contained therein. Calculations used to determine the number of square meters in a structure will be based on the structure’s exterior dimensions, measured at the largest horizontal projections when erected on site. These dimensions include all expandable rooms, cabinets, and other projections containing interior space but do not include inside bay windows.
Manufactured Home
A factory-assembled structure or structures transportable in one or more sections that is built on a permanent chassis and designed to be used as a dwelling without a permanent foundation where connected to the required utilities and that includes the plumbing, heating, air-conditioning, and electric systems contained therein.
Mobile Home
A vehicular-type unit primarily designed as temporary living quarters for recreational, camping, or travel use, which either has its own motive power or is mounted on or drawn by another vehicle. The basic entities are travel trailer, camping trailer, truck camper, and motor home.
Recreational Vehicle
A plot of land upon which two or more recreational vehicle sites are located, established, or maintained for occupancy by recreational vehicles of the general public as temporary living quarters for recreation or vacation purposes.
Recreational Vehicle Park
A building unit that floats on water, is moored in a permanent location, and has a premises wiring system served through connection by permanent wiring to an electricity supply system not located on the premises.
Floating Building
An enclosed assembly that can include receptacles, circuit breakers, fused switches, fuses, watt-hour meter(s), and monitoring means approved for marine use.
Marine Power Outlet
Utilizes fluorescent lamps, high intensity discharge lamps, or neon tubing.
Neon Tubing - Electric-discharge tubing manufactured into shapes that form letters, parts of letters, skeleton tubing, outline lighting, other decorative elements, or art forms, and filled with various inert gases.
Electric-Discharge Lighting
Neon tubing that is itself the sign/outlines lighting and not attached to an enclosure.
Skeleton Tubing
A lighting fixture intended for installation in the wall of a pool or fountain in a niche that is sealed against the entry of pool water.
Dry-Niche Luminaire (Lighting Fixture)
A lighting fixture intended for installation in a forming shell mounted in a pool or fountain structure where the fixture will be completely surrounded by water.
Wet-Niche Luminaire (Lighting Fixture)
Shall be self-contained units, circuit-breaker types, receptacle types, or other approved types.
Ground-Fault Circuit Interrupters (GFCI)
A complete, environmentally protected unit consisting of solar cells, optics, inverter, and other components, exclusive of tracker, designed to generate ac power when exposed to sunlight.
Alternating-Current Photovoltaic Module
A mechanically integrated assembly of modules or panels with a support structure and foundation, tracker, and other components, as required, to form a direct-current power-producing unit.
Array
A photovoltaic array that has two outputs, each having opposite polarity to a common reference point or center tap.
Bipolar Photovoltaic Array
A diode used to block reverse flow of current into a photovoltaic source circuit.
Blocking Diode
Photovoltaic cells, devices, modules, or modular materials that are integrated into the outer surface/structure of a building and serve as the outer protective surface of that building.
Building Integrated Photovoltaics
Equipment that controls dc voltage or dc current, or both, used to charge a battery
Charge Controller
Equipment that regulates the charging process of a battery by diverting power from energy storage to DC or AC loads or to an interconnected utility service.
Diversion Charge Controller
A system comprised of multiple power sources. These power sources may include photovoltaic, wind, micro-hydro generators, engine-driven generators, and others, but do not include electrical production and distribution network systems. Energy storage systems, such as batteries, do not constitute a power source for the purpose of this definition.
Hybrid System
A solar photovoltaic system that operates in parallel with or may deliver power to an electrical production and distribution network. For the purpose of this definition, an energy storage subsystem of a solar photovoltaic system, such as a battery, is not another electrical production source
Interactive System
Equipment that is used to change voltage level or waveform, or both, of electrical energy [also known as a power conditioning unit (PCU) or power conversion system (PCS)] is a device that changes dc input to an ac output. Inverters may also function as battery chargers that use alternating current from another source and convert it into direct current for charging batteries.
Inverter
A complete, environmentally protected unit consisting of solar cells, optics, and other components, exclusive of tracker, designed to generate dc power when exposed to sunlight.
Module
A collection of modules mechanically fastened together, wired, and designed to provide a field- installable unit.
Panel -
The basic photovoltaic device that generates electricity when exposed to light
Solar Cell
The total components and subsystems that, in combination, convert solar energy into electrical energy suitable for connection to utilization load.
Solar Photovoltaic System
A solar photovoltaic system that supplies power independently of an electrical production and distribution network.
Stand-Alone System
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