xal

as its own motive power or is mounted on or towed by another vehicle; is regulated by the National Highway Traffic Safety Administration as a vehicle or vehicle equipment; does not require a special highway use permit for operation on the highways; and can be easily transported and set up on a daily...

as its own motive power or is mounted on or towed by another vehicle; is regulated by the National Highway Traffic Safety Administration as a vehicle or vehicle equipment; does not require a special highway use permit for operation on the highways; and can be easily transported and set up on a daily basis by an individual. [1192:3.3.52] (551) (CMP-7) Informational Note: See NFPA 1192, Standard on Recreational Vehicles, Informative Annex A, for product types and definitions for motor homes and towable recreational vehicles. Recreational Vehicle Park. Any parcel or tract of land under the control of any person, organization, or governmental entity wherein two or more recreational vehicle, recreational park trailer, and/or other camping sites are offered for use by the public or members of an organization for overnight stays. (551) (CMP-7) Recreational Vehicle Site. A specific area within a recreational vehicle park or campground that is set aside for use by a camping unit. (551) (CMP-7) Recreational Vehicle Site Supply Equipment. A power outlet assembly located near the point of entrance of supply conductors to a recreational vehicle site and intended to constitute the disconnecting means for connected recreational vehicles. (551) (CMP-7) Recreational Vehicle Stand. That area of a recreational vehicle site intended for the placement of a recreational vehicle. (551) (CMP-7) Reference Grounding Point. The ground bus of the panelboard or isolated power system panel supplying the patient care room. [99:3.3.158] (517) (CMP-15) Relative Analgesia. A state of sedation and partial block of pain perception produced in a patient by the inhalation of concentrations of nitrous oxide insufficient to produce loss of consciousness (conscious sedation). (517) (CMP-15) Relay, Automatic Load Control. (Automatic Load Control Relay) An emergency lighting control device used to set normally dimmed or normally-off switched emergency lighting equipment to full power illumination levels in the event of a loss of the normal supply by bypassing the dimming/switching controls, and to return the emergency lighting equipment to normal status when the device senses the normal supply has been restored. (700) (CMP-13) Informational Note: See ANSI/UL 924, Emergency Lighting and Power Equipment, for the requirements covering automatic load control relays. ENHANCED CONTENT Collapse One use of automatic load control relays is in a lighting branch circuit supplied by the emergency system where the load is controlled by an energy management system. The automatic load control relay functions to restore the required level of emergency lighting where the lighting either has been dimmed or has been completely turned off by an energy management system. When the emergency loads are transferred from the normal source to the alternate source, the relay overrides the energy management mode and provides full power to the load. When the normal source is restored, the relay returns the load to the normal operating mode that is controlled by the energy management system. Remote-Control Circuit. Any electrical circuit that controls any other circuit through a relay or an equivalent device. (CMP-3) Remote Disconnect Control. An electric device and circuit that controls a disconnecting means through a relay or equivalent device. (645) (CMP-12) Resistance Heating Element. A specific separate element to generate heat that is stand-alone, externally attached to, embedded in, integrated with, or internal to the object to be heated. (CMP-17) Informational Note: Tubular heaters, strip heaters, heating cable, heating tape, heating blankets, immersion heaters, and heating panels are examples of resistance heaters. Restricted Industrial Establishment [as applied to hazardous (classified) locations]. Establishment with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation. (CMP-14) Retrofit Kit. A complete subassembly of parts and devices for field conversion of utilization equipment. (CMP-18) Retrofit Kit, General Use. (General Use Retrofit Kit) A kit consisting of primary parts, which does not include all the parts for a complete subassembly but includes a list of required parts and installation instructions to complete the subassembly in the field. (600) (CMP-18) Retrofit Kit, Sign Specific. (Sign Specific Retrofit Kit) A kit consisting of the necessary parts and hardware to allow for field installation in a host sign, based on the included installation instructions. (600) (CMP-18) Reverse Polarity Protection (Backfeed Protection). A system that prevents two interconnected power supplies, connected positive to negative, from passing current from one power source into a second power source. (393) (CMP-18) Ride Device. A device or combination of devices that carry, convey, or direct a person(s) over or through a fixed or restricted course within a defined area for the primary purpose of amusement or entertainment. (522) (CMP-15) Riser Cable, Cable Routing Assemblies, and Raceways. Cables, cable routing assemblies, and raceways that have fire-resistant characteristics capable of preventing the carrying of fire from floor to floor and are suitable for use in a vertical run in a shaft or from floor to floor. (722) (CMP-3) Safe Zone. Low probability of damage other than a slight swelling of the capacitor case, as identified by the case rupture curve of the capacitor. (460) (CMP-11) Safety Circuit. The part of a control system containing one or more devices that perform a safety-related function. [79:3.3.95] (CMP-12) Informational Note: See NFPA 79-2021, Electrical Standard for Industrial Machinery. Safety-related control system and safety interlock circuit are common terms that can be used to refer to the safety circuit in other standards. The safety circuit can include hard-wired, communication, and software-related components. Sealable Equipment. Equipment 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. (CMP-1) Informational Note: The equipment may or may not be operable without opening the enclosure. Sealed [as applied to hazardous (classified) locations]. Constructed such that equipment is sealed effectively against entry of an external atmosphere and is not opened during normal operation or for any maintenance activities. (CMP-14) Informational Note: See ANSI/UL 121201, Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations, for additional information. Sealed, Hermetically. (Hermetically Sealed) Sealed against the entrance of an external atmosphere, such that the seal is made by fusion of metal to metal, ceramic to metal, or glass to metal. (CMP-14) Informational Note: See ANSI/UL 121201, Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations, for additional information. Section Sign. A sign or outline lighting system, shipped as subassemblies, that requires field-installed wiring between the subassemblies to complete the overall sign. The subassemblies are either physically joined to form a single sign unit or are installed as separate remote parts of an overall sign. (600) (CMP-18) ENHANCED CONTENT Collapse The definition of the term section sign clarifies that the multiple parts are referred to as subassemblies, and the only field wiring involved is the connection between subassemblies and connection of the subassemblies to the power source. The power source may be a branch circuit or the secondary wiring from a sign power supply. In accordance with 600.3, section signs are required to be listed. In accordance with ANSI/UL 48, Standard for Electric Signs, each subassembly is provided with installation instructions containing detailed information on the mechanical and electrical connections to be performed when the subassemblies are installed to form the completed section sign. (Courtesy of Kieffer-Starlite) Selected Receptacles. A minimal number of receptacles selected by the health care facility’s governing body as necessary to provide essential patient care and facility services during loss of normal power. [99:3.3.164] (517) (CMP-15) Self-Contained Therapeutic Tubs or Hydrotherapeutic Tanks. A factory-fabricated unit consisting of a therapeutic tub or hydrotherapeutic tank with all water-circulating, heating, and control equipment integral to the unit. Equipment may include pumps, air blowers, heaters, light controls, sanitizer generators, and so forth. (680) (CMP-17) Separable Power Supply Cable Assembly. A flexible cord or cable, including ungrounded, grounded, and equipment grounding conductors, provided with a cord connector, an attachment plug, and all other fittings, grommets, or devices installed for the purpose of delivering energy from the source of electrical supply to the truck or transport refrigerated unit (TRU) flanged surface inlet. (626) (CMP-12) Separately Derived System. An electrical power supply output, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections. (CMP-5) ENHANCED CONTENT Collapse Examples of separately derived systems include generators, batteries, converter windings, transformers, and solar photovoltaic systems, provided they have no direct electrical connection to another source. The earth, metal enclosures, metal raceways, and equipment grounding conductors may provide incidental connection between systems. This definition clarifies that those systems can still be considered to be separately derived systems as long as the separately derived systems have no direct electrical connection to service-derived systems. See also 250.30(A)(6), which permits a common grounding electrode conductor to be installed for multiple separately derived systems. Service. The conductors and equipment connecting the serving utility to the wiring system of the premises served. (CMP-10) ENHANCED CONTENT Collapse A service can be supplied only by the serving utility. If electric energy is supplied by something other than the serving utility, the supplied conductors and equipment are considered feeders and not a service. Service Conductors. The conductors from the service point to the service disconnecting means. (CMP-10) ENHANCED CONTENT Collapse The term service conductors is broad and may include overhead service conductors, underground service conductors, and service-entrance conductors. The term specifically excludes any wiring on the supply side (serving utility side) of the service point. The service conductors originate at the service point (where the serving utility ends) and end at the service disconnect. Service conductors originate only from the serving utility. The definition no longer includes service drops and service laterals; those terms now apply only to conductors that are under the control of the serving utility. If the utility has specified that the service point is at the utility pole, the service conductors from an overhead distribution system originate at the utility pole and terminate at the service disconnecting means. If the utility has specified that the service point is at the utility manhole, the service conductors from an underground distribution system originate at the utility manhole and terminate at the service disconnecting means. Where utility-owned primary conductors are extended to outdoor pad-mounted transformers on private property, the service conductors originate at the secondary connections of the transformers only if the utility has specified that the service point is at the secondary connections. See also Part V of Article 235 and the enhanced content for 235.401 for information on service conductors exceeding 1000 volts, nominal. Service Conductors, Overhead. (Overhead Service Conductors) The overhead conductors between the service point and the first point of connection to the service-entrance conductors at the building or other structure. (CMP-10) Service Conductors, Underground. (Underground Service Conductors) 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. (CMP-10) Informational Note: 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 Drop. The overhead conductors between the serving utility and the service point. (CMP-10) ENHANCED CONTENT Collapse This definition correlates with the definition of the term service lateral. Service-drop and service-lateral conductors are conductors on the line side of the service point and are not subject to the NEC. Overhead conductors on the load side of the service point are overhead service conductors. In the exhibit below, the service-drop conductors run from the utility pole and connect to the service-entrance conductors at the service point. Conductors on the utility side of the service point are not covered by the NEC. The utility specifies the location of the service point. Exact locations of the service point can vary from utility to utility as well as from occupancy to occupancy. Service-Entrance Conductor Assembly. Multiple single-insulated conductors twisted together without an overall covering, other than an optional binder intended only to keep the conductors together. (CMP-6) Service-Entrance Conductors. The service conductors between the terminals of the service equipment to the service drop, overhead service conductors, service lateral, or underground service conductors. (CMP-10) Informational Note: Where service equipment is located outside the building walls, there could be no service-entrance conductors or they might be entirely outside the building. ENHANCED CONTENT Collapse The exhibit below illustrates service-entrance conductors in an overhead system. The system shows a service drop from a utility pole to attachment on a house and service-entrance conductors from point of attachment (spliced to service-drop conductors), down the side of the house, through the meter socket, and terminating in the service equipment. In this instance, the service point is at the drip loop. The conductors on the line side of the service point are under the control of the utility. The following two exhibits illustrate service-entrance conductors in an underground system. The first shows underground service lateral conductors run from a pole to a service point underground. The conductors from the service point into the building are underground service conductors. The second exhibit shows service lateral conductors run from a utility transformer. Service Equipment. The necessary equipment, consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the serving utility and intended to constitute the main control and disconnect of the serving utility. (CMP-10) ENHANCED CONTENT Collapse Service equipment may consist of circuit breakers or fused switches that are provided to disconnect all ungrounded conductors in a building or other structure from the service-entrance conductors. Individual meter socket enclosures are not considered service equipment according to 230.66(B) but must be listed and rated for the voltage and current rating of the service. The disconnecting means at any one location in a building or other structure is not allowed to consist of more than six circuit breakers or six switches. The disconnecting means is required to be readily accessible either outside or inside nearest the point of entrance of the service-entrance conductors. See also Part VI of Article 230 for service conductor disconnecting means requirements, and see 230.6 for service conductor requirements outside the building. Service Equipment, Mobile Home. (Mobile Home Service Equipment) The equipment containing the disconnecting means, overcurrent protective devices, and receptacles or other means for connecting a mobile home feeder assembly. (550) (CMP-7) Service Lateral. The underground conductors between the utility electric supply system and the service point. (CMP-10) ENHANCED CONTENT Collapse Service-drop and service-lateral conductors are conductors on the line side of the service point and are not subject to the requirements of the NEC. In other words, these conductors are under the exclusive control of the utility. Underground conductors on the load side of the service point are underground service conductors. As the following exhibits show, the underground service laterals may be run from poles or from transformers, with or without terminal boxes, provided they terminate at the service point. The next transition would be to the underground service conductors, which would connect to the service-entrance conductors, or they may terminate in a terminal box, meter, or some other enclosure, which may be inside or outside the building. Conductors on the utility side of the service point are not covered by the NEC. The utility specifies the location of the service point. Exact locations of the service point can vary from utility to utility as well as from occupancy to occupancy. Service Point. The point of connection between the facilities of the serving utility and the premises wiring. (CMP-10) Informational Note: The service point can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. The serving utility generally specifies the location of the service point based on the conditions of service. ENHANCED CONTENT Collapse The exact location for a service point is generally determined by the utility and can vary from utility to utility. Only those conductors that are located on the premises wiring side of the service point are covered by the NEC. Conductors on the serving utility side of the service point generally are not covered by the NEC. For example, a typical suburban residence has overhead conductors from the utility pole to the house. If the utility specifies that the service point is at the point of attachment of the overhead conductors to the house, the overhead conductors are service-drop conductors and are not covered by the NEC because the conductors are not on the premises wiring side of the service point. Alternatively, if the utility specifies that the service point is at the pole, the overhead conductors are considered overhead service conductors, and the NEC would apply to those conductors. Servicing. The process of following a manufacturer’s set of instructions or applicable industry standards to analyze, adjust, or perform prescribed actions upon equipment with the intention to preserve or restore the operational performance of the equipment. (CMP-1) Informational Note: Servicing often encompasses maintenance and repair activities. Shore Power. The electrical equipment required to power a floating vessel including, but not limited to, the receptacle and cords. (555) (CMP-7) Shoreline. The farthest extent of standing water under the applicable conditions that determine the electrical datum plane for the specified body of water. (682) (CMP-17) Short Circuit. An abnormal connection (including an arc) of relatively low impedance, whether made accidentally or intentionally, between two or more points of different potential. (CMP-10) 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. (CMP-10) ENHANCED CONTENT Collapse The short-circuit current rating is marked on the equipment nameplate as shown below. The available input current must not exceed this rating. Otherwise, the equipment can be damaged by short-circuit currents, posing a hazard to personnel and property. See also the definition of interrupting rating. Show Window. Any window, including windows above doors, 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. (CMP-2) Sign, Photovoltaic (PV) Powered (PV Powered Sign). [Photovoltaic (PV) Powered Sign] A complete sign powered by solar energy consisting of all components and subassemblies for installation either as an off-grid stand-alone, on-grid interactive, or non-grid interactive system. (600) (CMP-18) Sign Body. A portion of a sign that may provide protection from the weather but is not an electrical enclosure. (600) (CMP-18) Signaling Circuit. Any electrical circuit that energizes signaling equipment. (CMP-3) Simple Apparatus. An electrical component or combination of components of simple construction with well-defined electrical parameters that does not generate more than 1.5 volts, 100 mA, and 25 mW, or a passive component that does not dissipate more than 1.3 watts and is compatible with the intrinsic safety of the circuit in which it is used. (CMP-14) Informational Note No. 1: The following are examples of simple apparatus: Passive components; for example, switches, instrument connectors, plugs and sockets, junction boxes, resistance temperature devices, and simple semiconductor devices such as LEDs Sources of stored energy consisting of single components in simple circuits with well-defined parameters; for example, capacitors or inductors, whose values are considered when determining the overall safety of the system Sources of generated energy; for example, thermocouples and photocells, that do not generate more than 1.5 volts, 100 mA, and 25 mW Informational Note No. 2: See ANSI/UL 913, Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations, and ANSI/UL 60079-11, Explosive Atmospheres — Part 11: Equipment Protection by Intrinsic Safety “i”, for additional information. Single-Pole Separable Connector. 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. (CMP-18) Site-Isolating Device. A pole-mounted disconnecting means installed at the distribution point for the purposes of isolation, system maintenance, emergency disconnection, or connection of optional standby systems. (547) (CMP-7) ENHANCED CONTENT Collapse The site-isolating device provides a means to disconnect and isolate the agricultural premises wiring system from the serving utility under emergency conditions for maintenance of the load-side wiring system or to allow for the connection of an alternate power source when there is a power outage. In accordance with 547.41(A)(2), the site-isolating device must be pole-mounted. And, as its name implies, it is an isolating switch and is not considered to be the service disconnecting means for the agricultural premises. Skeleton Tubing. Neon tubing that is itself the sign or outline lighting and is not attached to an enclosure or sign body. (600) (CMP-18) Slip. A berthing space between or adjacent to piers, wharves, or docks; the water areas associated with boat occupation. [303:3.3.21] (555) (CMP-7) Informational Note: See the definition of Berth for additional information. Solid-State Phase-Control Dimmer. A solid-state dimmer where the wave shape of the steady-state current does not follow the wave shape of the applied voltage such that the wave shape is nonlinear. (CMP-15) ENHANCED CONTENT Collapse Solid-state phase-control dimmers are nonlinear devices. Where they are used, nonlinear loading of the neutral conductor occurs, which could necessitate increasing the size of the neutral cond