xak

ity is defined not only by the location of a patient bed but also by other equipment that supports a patient during examination or treatment. The vicinity is also determined by equipment in its normal location used for treatment or in the architect’s plans, rather than the temporary location of eq...

ity is defined not only by the location of a patient bed but also by other equipment that supports a patient during examination or treatment. The vicinity is also determined by equipment in its normal location used for treatment or in the architect’s plans, rather than the temporary location of equipment subject to movement by housekeeping staff or for the convenience of the medical staff. Patient Equipment Grounding Point. A jack or terminal that serves as the collection point for redundant grounding of electric appliances serving a patient care vicinity or for grounding other items in order to eliminate electromagnetic interference problems. [99:3.3.142] (517) (CMP-15) Performance Area. 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. (520) (CMP-15) Permanent Amusement Attraction. A ride device, entertainment device, or a combination of both that is installed such that portability or relocation is impracticable. (522) (CMP-15) Permanently Installed Decorative Fountains and Reflection Pools. Those that are constructed in the ground, on the ground, or in a building in such a manner that the fountain cannot be readily disassembled for storage, whether or not served by electrical circuits of any nature. These units are primarily constructed for their aesthetic value and are not intended for swimming or wading. (680) (CMP-17) Personnel Protection System (as applied to EVSE). A system of personnel protection devices and constructional features that when used together provide protection against electric shock of personnel. (625) (CMP-12) Phase, Manufactured. (Manufactured Phase) The phase that originates at the phase converter and is not solidly connected to either of the single-phase input conductors. (CMP-13) Phase Converter. An electrical device that converts single-phase power to 3-⁠phase electric power. (CMP-13) Informational Note: Phase converters have characteristics that modify the starting torque and locked-rotor current of motors served, and consideration is required in selecting a phase converter for a specific load. Phase Converter, Rotary. (Rotary-Phase Converter) A device that consists of a rotary transformer and capacitor panel(s) that permits the operation of 3-phase loads from a single-phase supply. (455) (CMP-13) Phase Converter, Static. (Static-Phase Converter) A device without rotating parts, sized for a given 3-phase load to permit operation from a single-phase supply. (455) (CMP-13) Photovoltaic Cell (PV). (Solar Cell). The basic photovoltaic device that generates dc electricity when exposed to light. (CMP-4) Pier. A structure extending over the water and supported on a fixed foundation (fixed pier), or on flotation (floating pier), that provides access to the water. [303:3.3.18] (CMP-7) Pier, Fixed. (Fixed Pier) Pier constructed on a permanent, fixed foundation, such as on piles, that permanently establishes the elevation of the structure deck with respect to land. [303:3.3.18.2] (CMP-7) Pier, Floating. (Floating Pier) Pier designed with inherent flotation capability that allows the structure to float on the water surface and rise and fall with water level changes. [303:3.3.18.3] (CMP-7) Pipeline. A length of pipe including pumps, valves, flanges, control devices, strainers, and/or similar equipment for conveying fluids. (CMP-17) Plenum. A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system. (CMP-3) ENHANCED CONTENT Collapse Because of concerns about the transfer of products of combustion through environmental air systems, the NEC provides specific requirements — in 300.22(B), (C), and (D) and in Articles 725, 760, 770, 800, 820, 830, and 840 — for the installation of wiring methods that are subject to the direct flow of environmental air. The NEC definition of the term plenum is similar to the definition of plenum in NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems. The definition is used in conjunction with the requirements for the installation of wiring methods in spaces used for air transfer that are not specifically fabricated as ducts for environmental air. See also Article 645 for requirements specific to the air-handling space under a computer room floor. Plenum Cable, Cable Routing Assemblies, and Raceways. Cables, cable routing assemblies, and raceways that have adequate fire-resistant and low smoke-producing characteristics and are suitable for use in ducts, plenums, and other spaces used for environmental air. (722) (CMP-3) Point of Entrance. The point within a building at which the wire or cable emerges from an external wall, from the roof, or from a concrete floor slab. (CMP-16) Pool. Manufactured or field-constructed equipment designed to contain water on a permanent or semipermanent basis and used by persons for swimming, wading, immersion, or therapeutic purposes, but not including bodies of water incorporated as part of an industrial process or lakes, lagoons, surf parks, or other natural and man-made bodies of water that may incorporate swimming and swimming areas. (680) (CMP-17) Informational Note: Natural and man-made bodies of water, which includes lakes, lagoons, surf parks, or other similar bodies of water, are addressed in Article 682. Pool, Immersion. (Immersion Pool) A pool for ceremonial or ritual immersion of users, which is designed and intended to have its contents drained or discharged. (680) (CMP-17) ENHANCED CONTENT Collapse Immersion pools used for baptisms or other ceremonial rituals that are permanently installed inside or outside a building must comply with the requirements in Parts I and IV of Article 680; portable immersion pools are covered by the requirements in Parts I and III. Pool, Permanently Installed Swimming, Wading, Immersion, and Therapeutic. (Permanently Installed Swimming, Wading, Immersion, and Therapeutic Pools) Those that are constructed or installed in the ground or partially in the ground, and all pools installed inside of a building, whether or not served by electrical circuits of any nature. (680) (CMP-17) ENHANCED CONTENT Collapse Swimming pools without electrical equipment, such as underwater lighting or filtration pumps, are still required to comply with applicable requirements in Article 680 such as those covering overhead clearances, the proximity of underground wiring, and equipotential bonding. This underscores the concern for electrical influences that not only could originate from the premises wiring, but it also addresses the concern about stray currents in the earth resulting from the required grounding and bonding of premises and utility electrical systems or a failure of a premises system at a neighboring property that introduces stray current into the earth. In brook- or stream-fed “natural” swimming pools, water circulation is accomplished by the water flowing through the pool instead of by an electric motor-driven filtration pump. Pool, Storable; used for Swimming, Wading, or Immersion (Storable Immersion Pool). (Storable Pool) Pools installed entirely on or above the ground that are intended to be stored when not in use and are designed for ease of relocation, regardless of water depth. (680) (CMP-17) ENHANCED CONTENT Collapse Storable pools are intended to be temporary structures without the need for special wiring or modification to the pool site. They are usually sold as a complete package, consisting of the pool walls, vinyl liner, plumbing kit, and pump/filter device. A storable pool is often disassembled and stored during the winter months. Pool Cover, Electrically Operated. (Electrically Operated Pool Cover) Motor-driven equipment designed to cover and uncover the water surface of a pool by means of a flexible sheet or rigid frame. (680) (CMP-17) Pool Lift, Electrically Powered. (Electrically Powered Pool Lift) An electrically powered lift that provides accessibility for people with disabilities to and from a pool or spa. (680) (CMP-17) Portable. A device intended for indoor or outdoor use that is designed to be hand-carried from location to location, or easily transported without the use of other devices or equipment. (625) (CMP-12) Portable. X-ray equipment designed to be hand-carried. (660) (CMP-12) Portable (as applied to equipment). Equipment that is actually moved or can easily be moved from one place to another in normal use. (680) (CMP-17) Portable Power Distribution Unit. A power distribution box containing receptacles and overcurrent devices. (520) (CMP-15) Informational Note: See ANSI/UL 1640, Portable Power-Distribution Equipment, for information on portable power distribution units. Portable Structures. Units designed to be moved including, but not limited to, amusement rides, attractions, concessions, tents, trailers, trucks, and similar units. (525) (CMP-15) Portable Substation. A portable assembly, usually mounted on a trailer, containing primary and secondary switchgear and a transformer. (530) (CMP-15) Powder Filling “q”. Type of protection where electrical parts capable of igniting an explosive atmosphere are fixed in position and completely surrounded by filling material (glass or quartz powder) to prevent the ignition of an external explosive atmosphere. (CMP-14) Informational Note: See ANSI/UL 60079-5, Explosive Atmospheres — Part 5: Equipment protection by powder filling “q”, for additional information. Power Outlet. An enclosed assembly that may include receptacles, circuit breakers, fuseholders, fused switches, buses, and watt-hour meter mounting means; intended to supply and control power to mobile homes, recreational vehicles, park trailers, or boats or to serve as a means for distributing power required to operate mobile or temporarily installed equipment. (CMP-7) Power Outlet, Marina. (Marina Power Outlet) An enclosed assembly that can include equipment such as receptacles, circuit breakers, fused switches, fuses, watt-hour meters, panelboards, and monitoring means identified for marina use. (555) (CMP-7) Power Production Equipment. Electrical generating equipment supplied by any source other than a utility service, up to the source system disconnecting means. (CMP-4) Informational Note: Examples of power production equipment include such items as generators, solar photovoltaic systems, and fuel cell systems. Power Source Output Conductors. The conductors between power production equipment and the service or other premises wiring. (CMP-4) Power Supply. A Class 2 power supply connected between the branch-circuit power distribution system and the busbar low-voltage suspended ceiling power distribution system. (393) (CMP-18) Power-Supply Cord. An assembly consisting of an attachment plug and a length of flexible cord connected to utilization equipment. (CMP-6) Premises. The land and buildings located on the user’s side of the point of demarcation between the communications service provider and the user. (800) (CMP-16) Premises-Powered. Using power provided locally from the premises. (CMP-16) Premises Wiring (System). Interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed. This includes one of the following: Wiring from the service point or power source to the outlets Wiring from and including the power source to the outlets where there is no service point Such wiring does not include wiring internal to appliances, luminaires, motors, controllers, motor control centers, and similar equipment. (CMP-1) Informational Note: Power sources include, but are not limited to, interconnected or stand-alone batteries, solar photovoltaic systems, other distributed generation systems, or generators. ENHANCED CONTENT Collapse A premises wiring system does not have to be supplied by an electric utility. For example, portable generators and stand-alone PV systems can supply premises wiring systems. If there is no service point, there are no service conductors. The supply conductors are feeder conductors. Pressurized. The process of supplying an enclosure with a protective gas with or without continuous flow at sufficient pressure to prevent the entrance of combustible dust or ignitible fibers/flyings. (CMP-14) Pressurized Enclosure “p”. Type of protection for electrical equipment that uses the technique of guarding against the ingress of the external atmosphere, which might be explosive, into an enclosure by maintaining a protective gas therein at a pressure above that of the external atmosphere. (CMP-14) Informational Note: See ANSI/UL-60079-2, Explosive Atmospheres — Part 2: Equipment protection by pressurized enclosures “p”, for additional information. Pressurized Room “p”. A room volume protected by pressurization and of sufficient size to permit the entry of a person who might occupy the room. (CMP-14) Informational Note: See ANSI/UL 60079-13, Explosive Atmospheres — Part 13: Equipment protection by pressurized room “p” and artificially ventilated room “v”, for information on the requirements for rooms intended for human entry where pressurization is used as a means of reducing the risk of explosion. Primary Pad. A device external to the EV that transfers power via the contactless coupling as part of a wireless power transfer system. (625) (CMP-12) Primary Source. An electric utility or another source of power that acts as the main forming and stabilizing source in an electric power system. (CMP-4) Prime Mover. The machine that supplies the mechanical horsepower to a generator. (CMP-13) Process Seal. A seal between electrical systems and flammable or combustible process fluids where a failure could allow the migration of process fluids into the premises’ wiring system. (CMP-14) Informational Note: See ANSI/UL 122701, Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process Fluids, for additional information. Production Areas. Areas where portable electrical equipment is used to implement the capture of images. (530) (CMP-15) Projector, Nonprofessional. (Nonprofessional Projector) Those types of projectors that do not comply with the definition of Professional-Type Projector. (540) (CMP-15) Projector, Professional-Type. (Professional-Type Projector) A type of projector using 35- or 70-mm film that has a minimum width of 35 mm (13⁄8 in.) and has on each edge 212 perforations per meter (5.4 perforations per inch), or a type using carbon arc, xenon, or other light source equipment that develops hazardous gases, dust, or radiation. (540) (CMP-15) Proscenium. The wall and arch that separates the stage from the auditorium (i.e., house). (520) (CMP-15) Protection by Enclosure “t”. Type of protection for explosive dust atmospheres where electrical equipment is provided with an enclosure providing dust ingress protection and a means to limit surface temperatures. (CMP-14) Informational Note: See ANSI/UL 60079-31, Explosive Atmospheres — Part 31: Equipment Dust Ignition Protection by Enclosure “t”, for additional information. Psychiatric Hospital. A building used exclusively for the psychiatric care, on a 24-hour basis, of four or more inpatients. (517) (CMP-15) Purged and Pressurized. The process of (1) purging, supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level; and (2) pressurization, supplying an enclosure with a protective gas with or without continuous flow at sufficient pressure to prevent the entrance of a flammable gas or vapor, a combustible dust, or an ignitible fiber. (CMP-14) Informational Note: See NFPA 496, Standard for Purged and Pressurized Enclosures for Electrical Equipment, for additional information. Purpose-Built. A custom luminaire, a piece of lighting equipment, or an effect that is constructed for a specific purpose and is not serially manufactured or available for general sale. (530) (CMP-15) PV DC Circuit (PV System DC Circuit). Any dc conductor in PV source circuits, PV string circuits, and PV dc-to-dc converter circuits. (690) (CMP-4) PV DC Circuit, Source. (PV Source Circuit) The PV dc circuit conductors between modules in a PV string circuit, and from PV string circuits or dc combiners, to dc combiners, electronic power converters, or a dc PV system disconnecting means. (690) (CMP-4) PV DC Circuit, String. (PV String Circuit) The PV source circuit conductors of one or more series-connected PV modules. (690) (CMP-4) PV Module (Module). A complete, environmentally protected unit consisting of solar cells and other components designed to produce dc power. (CMP-4) ENHANCED CONTENT Collapse An alternating current (ac) PV module consists of a single integrated unit. Because there is no accessible, field-installed dc wiring in this single unit, the direct current (dc) PV source-circuit requirements in the NEC are not applicable to the dc wiring in an ac PV module. PV (Photovoltaic) System (PV System) (Photovoltaic System). The total components, circuits, and equipment up to and including the PV system disconnecting means that, in combination, convert solar energy into electric energy. (CMP-4) Qualified Person. One who has 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. (CMP-1) Informational Note: See NFPA 70E-2021, Standard for Electrical Safety in the Workplace, for electrical safety training requirements. ENHANCED CONTENT Collapse Section 110.6(A) of NFPA 70E®, Standard for Electrical Safety in the Workplace®, 2021 edition, provides training requirements for qualified and unqualified persons who might be exposed to electrical hazards. Raceway. An enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code. (CMP-8) ENHANCED CONTENT Collapse Cable trays are support systems for wiring methods and are not considered to be raceways. For cable tray requirements, see Article 392. Raceway Cell. A single enclosed tubular space in a cellular metal or concrete floor member, the axis of the cell being parallel to the axis of the floor member. (CMP-8) Raceway, Cellular Metal Floor. (Cellular Metal Floor Raceway) The hollow spaces of cellular metal floors, together with suitable fittings, that may be approved as enclosed channel for electrical conductors. (CMP-8) Raceway, Communications. (Communications Raceway) An enclosed channel of nonmetallic materials designed expressly for holding communications wires and cables; optical fiber cables; data cables associated with information technology and communications equipment; Class 2, Class 3, and Type PLTC cables; and power-limited fire alarm cables in plenum, riser, and general-purpose applications. (CMP-16) Raceway, Strut-Type Channel. (Strut-Type Channel Raceway) A metal raceway that is intended to be mounted to the surface of or suspended from a structure, with associated accessories for the installation of electrical conductors and cables. (CMP-8) Raceway, Surface Metal. (Surface Metal Raceway) A metal 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. (CMP-8) Raceway, Surface Nonmetallic. (Surface Nonmetallic Raceway) A nonmetallic 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. (CMP-8) Raceway, Underfloor. (Underfloor Raceway) A raceway and associated components designed and intended for installation beneath or flush with the surface of a floor for the installation of cables and electrical conductors. (CMP-8) Rail. The structural support for the suspended ceiling system typically forming the ceiling grid supporting the ceiling tile and listed utilization equipment, such as sensors, actuators, A/V devices, and low-voltage luminaires and similar electrical equipment. (393) (CMP-18) Rainproof. Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions. (CMP-1) ENHANCED CONTENT Collapse See also 110.28 and its enhanced content for more information on enclosures considered to be rainproof. Raintight. Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions. (CMP-1) ENHANCED CONTENT Collapse See also Table 110.28 for information on enclosure types that are considered to be raintight and 300.6(A)(2) for related requirements for raintight boxes and cabinets. Rated-Load Current (RLC). The current of a hermetic refrigerant motor-compressor resulting when it is operated at the rated load, rated voltage, and rated frequency of the equipment it serves. (440) (CMP-11) Rated Output Power. The amplifier manufacturer’s stated or marked output power capability into its rated load. (640) (CMP-12) Rated Power. The output power of a wind turbine at its rated wind speed. (694) (CMP-4) Informational Note: See IEC 61400-12-1, Power Performance Measurements of Electricity Producing Wind Turbines, for the method for measuring wind turbine power output. Receptacle. A contact device installed at the outlet for the connection of an attachment plug, or for the direct connection of electrical utilization equipment designed to mate with the corresponding contact device. A single receptacle is a single contact device with no other contact device on the same yoke or strap. A multiple receptacle is two or more contact devices on the same yoke or strap. (CMP-18) Informational Note: A duplex receptacle is an example of a multiple receptacle that has two receptacles on the same yoke or strap. ENHANCED CONTENT Collapse Not all receptacles are for cord-and-plug-connected equipment. A receptacle can be used for the connection of specific utilization equipment, such as luminaires. Pictured below is an example of a locking support and mounting receptacle used for the connection of luminaires. (Courtesy of Safety Quick Lighting and Fans Corp.) Receptacle, Weight-Supporting Ceiling (WSCR). (Weight-Supporting Ceiling Receptacle) A contact device installed at an outlet box for the connection and support of luminaries or ceiling-suspended (paddle) fans using a weight-supporting attachment fitting (WSAF). (CMP-18) Informational Note: See ANSI/NEMA WD 6, American National Standard for Wiring Devices — Dimensional Specifications, for the standard configuration of weight-supporting ceiling receptacles and related weight-supporting attachment fittings. Receptacle Outlet. An outlet where one or more receptacles are installed. (CMP-18) Reconditioned. Electromechanical systems, equipment, apparatus, or components that are restored to operating conditions. This process differs from normal servicing of equipment that remains within a facility, or replacement of listed equipment on a one-to-one basis. (CMP-1) Informational Note: The term reconditioned is frequently referred to as rebuilt, refurbished, or remanufactured. Recreational Vehicle (RV) (Camping Trailer) (Motor Home) (Travel Trailer) (Truck Camper). A vehicle or slide-in camper that is primarily designed as temporary living quarters for recreational, camping, or seasonal use; h