Article 100 NEC Definitions (Letter Q y R)

Qualified Person

A qualified person is someone with skills and knowledge related to the construction and operation of electrical equipment and installations, who has also received safety training to recognize and avoid potential hazards.
Informational Note: For electrical safety training requirements, refer to NFPA 70E—2021, Standard for Electrical Safety in the Workplace.
(CMP—1)

Raceway

A raceway is an enclosed channel designed specifically for holding wires, cables, or busbars. It may also serve additional functions as permitted by this Code.
(CMP—8)

Raceway Cell

A raceway cell is a single enclosed tubular space within a cellular metal or concrete floor member, with its axis parallel to the axis of the floor member.
(CMP—8)

Raceway, Cellular Metal Floor (Cellular Metal Floor Raceway)

This term refers to the hollow spaces within cellular metal floors, along with suitable fittings, that may be approved as an enclosed channel for electrical conductors.
(CMP—8)

Raceway, Communications (Communications Raceway)

An enclosed channel made from nonmetallic materials, designed specifically for holding communications wires and cables, including optical fiber cables, data cables for information technology and communication equipment, Class 2 and 3 cables, and power-limited fire alarm cables in various applications such as plenum, riser, and general-purpose.
(CMP—16)

Raceway, Strut-Type Channel (Strut-Type Channel Raceway)

A strut-type channel raceway is a metal raceway intended to be mounted to the surface or suspended from a structure. It includes accessories for the installation of electrical conductors and cables.
(CMP—8)

Raceway, Surface Metal (Surface Metal Raceway)

A surface metal raceway is a metal raceway designed 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)

This is a nonmetallic raceway designed to be mounted to the surface of a structure. It also comes with couplings, connectors, boxes, and fittings to facilitate the installation of electrical conductors.
(CMP—8)

Raceway, Underfloor (Underfloor Raceway)

An underfloor raceway is a raceway system intended to be installed beneath or flush with the surface of a floor for the installation of cables and electrical conductors.
(CMP—8)

Rail

A rail is a structural support for a suspended ceiling system, typically forming the ceiling grid that supports ceiling tiles and listed utilization equipment like sensors, actuators, A/V devices, and low-voltage luminaires.
(CMP—18)

Rainproof

Rainproof refers to equipment constructed or treated to prevent rain from interfering with its operation under specified test conditions.
(CMP—1)

Raintight

Raintight refers to equipment that is constructed or protected so that it will not allow rainwater to enter under specified test conditions.
(CMP—1)

Rated-Load Current (RLC)

The rated-load current (RLC) refers to the current of a hermetic refrigerant motor-compressor when it is operating at the rated load, rated voltage, and rated frequency of the equipment it serves.
(CMP—11)

Rated Output Power

Rated output power is the amplifier manufacturer’s stated or marked power capability into its rated load.
(CMP—12)

Rated Power

Rated power refers to the output power of a wind turbine at its rated wind speed.
(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 receptacle is a contact device installed at the outlet for connecting an attachment plug or directly connecting electrical utilization equipment.

• Single Receptacle: A single contact device with no other contact device on the same yoke or strap.
• Multiple Receptacle: 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.

Receptacle, Weight-Supporting Ceiling (WSCR)

A weight-supporting ceiling receptacle is installed in an outlet box for the connection and support of luminaries or ceiling-suspended fans using a weight-supporting attachment fitting.
Informational Note: See ANSI/NEMA WD 6, American National Standard for Wiring Devices for dimensional specifications.
(CMP—18)

Receptacle Outlet

An outlet where one or more receptacles are installed.
(CMP—18)

Reconditioned

Reconditioned refers to electromechanical systems, equipment, or components that are restored to operating conditions, different from normal servicing or replacing equipment on a one-to-one basis.
Informational Note: The term reconditioned is often referred to as rebuilt, refurbished, or remanufactured.
(CMP—1)

Recreational Vehicle (RV)

A recreational vehicle (RV) is a vehicle or slide-in camper primarily designed as temporary living quarters for recreational or camping use. It is self-propelled or mounted on another vehicle, regulated by the National Highway Traffic Safety Administration, and easily transportable and set up.
Informational Note: See NFPA 1192, Standard on Recreational Vehicles, for definitions and product types.
(CMP—7)

Recreational Vehicle Park

A recreational vehicle park is a parcel of land offering two or more recreational vehicle sites for overnight stays, controlled by a person or organization.
(CMP—7)

Recreational Vehicle Site

A recreational vehicle site is a designated area within a recreational vehicle park set aside for the use of a camping unit.
(CMP—7)

Recreational Vehicle Site Supply Equipment

The recreational vehicle site supply equipment is a power outlet assembly near the supply conductors’ entry point into a recreational vehicle site, acting as the disconnecting means.
(CMP—7)

Recreational Vehicle Stand

A recreational vehicle stand is the designated area within a recreational vehicle site for placing a recreational vehicle.
(CMP—7)

Reference Grounding Point

The reference grounding point is the ground bus of the panelboard or isolated power system panel supplying a patient care room.
(CMP—15)

Relative Analgesia

Relative analgesia is a state of sedation and partial pain perception block caused by inhaling nitrous oxide, insufficient to cause loss of consciousness (conscious sedation).
(CMP—15)

Relay, Automatic Load Control

An automatic load control relay is a device used in emergency lighting to restore normally dimmed or off emergency lighting to full power during a loss of normal supply. It returns the lighting to normal status once the supply is restored.
(CMP—13)
Informational Note: See ANSI/UL 924, Emergency Lighting and Power Equipment, for detailed requirements.

Remote-Control Circuit

A remote-control circuit is an electrical circuit that controls another circuit through a relay or equivalent device.
(CMP—3)

Remote Disconnect Control

A remote disconnect control is an electrical device and circuit used to control a disconnecting means through a relay or equivalent device.
(CMP—12)

Resistance Heating Element

A resistance heating element is a standalone element designed to generate heat, which can be externally attached, embedded, or integrated with the object being heated.
Informational Note: Examples include tubular heaters, heating cable, heating tape, and immersion heaters.
(CMP—17)

Restricted Industrial Establishment

A restricted industrial establishment refers to locations with restricted public access where qualified persons perform maintenance and service installations.
(CMP—14)

Retrofit Kit

A retrofit kit is a complete subassembly of parts and devices designed for field conversion of utilization equipment.
(CMP—18)

Retrofit Kit, General Use

A general use retrofit kit is a kit consisting of primary parts, with instructions for completing the subassembly in the field.
(CMP—18)

Retrofit Kit, Sign Specific

A sign-specific retrofit kit includes parts and hardware for field installation in a host sign, based on the included instructions.
(CMP—18)

Reverse Polarity Protection (Backfeed Protection)

Reverse polarity protection prevents two interconnected power supplies from passing current into each other when connected positive to negative.
(CMP—18)

Ride Device

A ride device is a combination of devices that carry or direct people over a fixed or restricted course within an area for amusement or entertainment.
(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)

---

Summary Table

Term	Definition
Qualified Person	A person trained to recognize and avoid electrical hazards.
Raceway	An enclosed channel for wires, cables, or busbars.
Raceway Cell	A tubular space in a cellular floor member.
Raceway, Cellular Metal Floor	Hollow spaces in cellular metal floors for conductors.
Raceway, Communications	Raceway for communications and data cables.
Raceway, Strut-Type Channel	Metal raceway mounted to a surface for electrical conductors.
Raceway, Surface Metal	Metal raceway mounted to a structure’s surface.
Raceway, Surface Nonmetallic	Nonmetallic raceway mounted to a structure’s surface.
Raceway, Underfloor	Raceway installed under or flush with the floor.
Rail	Structural support for suspended ceiling systems.
Rainproof	Protection against rain interference with operation.
Raintight	Protection from rain entering equipment.
Rated-Load Current (RLC)	Current of a refrigerant motor-compressor under rated conditions.
Rated Output Power	Amplifier’s stated output power capability.
Rated Power	Output power of a wind turbine at rated wind speed.
Receptacle	A device for connecting electrical equipment.
Receptacle, Weight-Supporting Ceiling	Receptacle for supporting ceiling equipment.
Receptacle Outlet	An outlet with one or more receptacles installed.
Reconditioned	Equipment restored to operating conditions.
Recreational Vehicle (RV)	A self-propelled or towable vehicle for temporary living quarters.
Recreational Vehicle Park	Land offering multiple recreational vehicle sites.
Recreational Vehicle Site	A designated area for a camping unit in a park.
Recreational Vehicle Site Supply Equipment	Power outlet assembly for disconnecting recreational vehicles.
Recreational Vehicle Stand	The area for placing a recreational vehicle in a site.
Reference Grounding Point	Ground bus in a panel supplying a patient care room.
Relative Analgesia	Sedation state from nitrous oxide causing partial pain block.
Relay, Automatic Load Control	Emergency lighting control device for full illumination.
Remote-Control Circuit	A circuit controlling another via a relay.
Remote Disconnect Control	A device controlling disconnecting means through a relay.
Resistance Heating Element	Element designed to generate heat in various applications.
Restricted Industrial Establishment	Location where qualified persons service installations.
Retrofit Kit	Subassembly for field conversion of equipment.
Retrofit Kit, General Use	Kit with primary parts and installation instructions.
Retrofit Kit, Sign Specific	Kit for installation in a host sign.
Reverse Polarity Protection	System preventing current backfeed between power supplies.
Ride Device	Device that carries people over a fixed course for amusement.