Wiring Methods

Vocabulary flashcards for wiring methods based on lecture notes.

Open Wiring on Insulators

An exposed wiring method using cleats, knobs, tubes, and flexible tubing for the protection and support of single insulated conductors run in or on buildings, and not concealed by the building structure.

Concealed Knob-and-Tube Wiring

A wiring method using knobs, tubes, and flexible nonmetallic tubing for the protection and support of single insulated conductors concealed in hollow spaces of walls and ceilings of buildings.

Armored Cable (Type AC)

A fabricated assembly of insulated conductors in a flexible metal enclosure; also known as BX Cable.

Metal-Clad Cable (Type MC)

A factory assembly of one or more conductors, each individually insulated and enclosed in a metallic sheath of interlocking metal tape, or a smooth or corrugated metallic tube.

Mineral-Insulated, Metal-Sheathed Cable (Type MI)

A factory assembly of one or more conductors insulated with a highly-compressed refractory mineral and enclosed in liquidtight and gastight continuous copper or alloy steel sheathe.

Nonmetallic-Sheathed Cable (Type NM and NMC)

A factory assembly of two or more insulated conductors having an outer sheath of moisture resistant, flame-retardant, nonmetallic material.

Shielded Nonmetallic-Sheathed Cable (Type SNM)

A factory assembly of two or more insulated conductors in an extruded core of moisture-resistant, flame-resistant nonmetallic material, covered with an overlapping spiral metal tape and wire shield, and jacketed with an extruded nonmetallic material resistant to moisture, flame, oil, corrosion, fungal growth, and sunlight.

Service Entrance Cable (Types SE and USE)

A single conductor or multi-conductor assembly provided with or without an overall covering, primarily used for services.

Underground Feeder and Branch Circuit Cables (Type UF)

Approved Type UF cables in sizes 2.0 mm2 copper and 3.5 mm2 aluminum or copper-clad aluminum through 100 mm2, with an overall covering that is flame-retardant, moisture-resistant, fungus-resistant, corrosion-resistant, and suitable for direct burial in the earth.

Power and Control Tray Cable (Type TC)

A factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductor under a nonmetallic sheath, approved for installation in cable trays, raceways, or where supported by messenger wire.

Flat Cable Assemblies (Type FC)

An assembly of parallel conductors formed integrally with an insulating material web specially designed for field installation in metal surface raceway.

Flat Conductor Cable (Type FCC)

Cable consisting of three or more flat copper conductors placed edge-to-edge and separated and enclosed within an insulating assembly.

Nonmetallic Extensions

An assembly of two insulated conductors within a nonmetallic jacket or an extruded thermoplastic covering; includes both surface extensions and aerial cable.

Medium Voltage Cable (Type MV)

A single or multi-conductor solid dielectric cable rated at 2001 volts or higher.

Messenger-Supported Wiring

An exposed support system using a messenger wire to support insulated conductors.

Integrated Gas Spacer Cable (Type IGS)

A factory assembly of one or more conductors, each individually insulated and enclosed in a loose-fit nonmetallic flexible conduit.

Raceway

An enclosed channel designed expressly for holding wires, cables, or busbars with additional functions.

Intermediate Metal Conduit (IMC)

A metal raceway of circular cross-section with integral or associated couplings, connectors, and fittings approved for the installation of electrical conductors.

Rigid Metal Conduit (RMC)

A raceway specially constructed for pulling in or withdrawing wires or cables after the conduit is in place, made of metal pipe of standard weight and thickness permitting the cutting of standard threads.

Rigid Nonmetallic Conduit

A type of conduit and fittings of suitable nonmetallic material that is resistant to moisture and chemical atmosphere.

Liquidtight 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.

Flexible Metallic Tubing (FMT)

Non-rigid metal conduit into which conductors may be drawn.

Electrical Metallic Tubing (EMT)

Metal pipe into which electrical conductors may be drawn, with a thinner wall thickness than a rigid metal conduit.

Surface Metal Raceway (SMR)

A raceway consisting of an assembly of metal backing and capping.

Surface Nonmetallic Raceway

A type of nonmetallic raceway.

Underfloor Raceway

A raceway type suitable for use under floor.

Cellular Floor Raceway

The hollow spaces of cellular metal floors together with suitable fittings which may be approved enclosure for electrical conductors.

Multi-outlet Assembly

A type of surface or flush raceway designed to receive conductors and receptacles assembled in the field or in the factory.

Busway

An approved, completely assembled metal troughing and fitting containing bare conductors intended for use as feeders, the conductors being suitably supported on insulators.

Cable Tray

A unit of assembly of units or sections and associated fittings forming a rigid structural system used to support cables.

Cable Bus

An approved assembly of insulated conductors with fittings and conductors terminating in a completely enclosed ventilated metal housing.

Type SE

Possesses a flame-retardant moisture-resistant covering.

Type USE

Type USE cables used for service laterals shall be permitted to emerge above ground outside at terminations in meter bases or other enclosures where protected. Furthermore, they can also be utilized as branch circuit connectors or feeders.