Electrical Wire and Cable Buying Guide

Armor-Clad (AC) Cable: AC cable includes THHN-insulated conductors with 16-gauge aluminum bond wire placed inside the armor to act as a grounding conductor.

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Automotive Cable: This is a general-purpose thermoplastic (GPT) wire, also referred to as primary wire. Normal applications are within motor vehicles with limited exposure to fluids, physical wear and abuse.

Bayonet Neill-Concelman (BNC) Cable: BNC cables are small, quick-connect/disconnect radio frequency connectors used for coaxial cables.

Category Cable: This is used for systems and data networking systems. Cat 5e is the most common variety of category cable that&#;s used for computer networking on internet service installations. The conductor pairs are twisted together to prevent cross-talk and interference from other paired conductors in the cable, as well as external interference. The higher the megahertz (MHz) capability, the more twists per foot.

Coaxial Cable: This is a metallic cable that carries television and video signals. It connects to video equipment and features a central conductor with a dielectric insulator, metallic shield and plastic jacket.

Doorbell Wire: Doorbell wire is used to connect a wired doorbell or video doorbell to a home&#;s electrical system. 18-gauge wire is the variety most often used.

Dual Armored Cable: This is a durable cable that offers protection without employing electrical conduit, elbows, offsets (which can be expensive) or conduit couplings. For areas where the cable may be exposed to moisture, metal-clad armor prevents corrosion. 

Flexible Cord: Typically used for industrial machinery, washing machines and large appliances, portable tools, equipment, and extension or power cords, flexible/power cord has its own naming convention based on a letter code, with a common option being SJEOOW.

• S: service cord (when not followed by a J, V or P; also indicates a rating of 600 volts)
• J: junior service cord, 300 volts
• T: thermoplastic
• E: elastomer, thermoplastic that looks and feels like rubber
• O: oil-resistant outer jacket
• OO: oil-resistant outer jacket and oil-resistant insulation
• P: parallel cord (light duty, flat)
• V: vacuum cleaner cord (light duty, round)
• W: sunlight- and moisture-resistant

Lamp Cord: Used with lamps, small appliances, radios and other similar products that don&#;t exceed 300 volts, lamp cord is available between 18- and 12-gauge sizes in a variety of colors. 

Landscape Lighting Low-Voltage (LV) Cable: This underground cable is suitable for outdoor accent lighting, landscape lighting and security lighting. Applications shouldn&#;t exceed 150 volts. It&#;s used for direct burial, is suitable for sunlight and is available between 16- and 8-gauge sizes.

Metal-Clad (MC) Cable: MC cable is used heavily in commercial electrical work, for running through concrete or in other commercial environments. Individual THHN wire conductors are run through an aluminum interlocked armor. It includes a grounding wire.

Mobile Home Feeder: This connects a mobile home to a supply of electricity where permanent wiring is required, and it&#;s suitable for direct burial and underground service entrance cable. It includes four RHH or RHW-2 conductors, with a white stripe for neutral and a green ground conductor. It&#;s sunlight-resistant.

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Network and Data Cable: This comes in three types &#; fiber-optic, twisted-pair and coaxial cable &#; and is used to connect multiple networking devices or computers in a network.

NM-B: This is a non-metallic sheathed cable that&#;s used as a residential building wire for branch circuits for outlets, lighting and other residential applications. NM-B is available between 14 AWG and 6 AWG with two or three conductors.

Preassembled Whips: These are pre-cut lengths of armored cable designed to increase jobsite productivity. Assembly comes with pre-stripped THHN conductors and pre-installed zinc die-cast, snap-in fittings.

Residential Grounding Wire: This is bare copper wire that&#;s available in 4-, 6- and 8-gauge solid and stranded construction. It&#;s used to ground the residential electrical system, usually at the meter before it enters the dwelling. It&#;s also used for grounding the perimeter surface around pools.

Service Entrance Cable: This includes individual conductors rated XHHW-2 or THHN/THWN and feeds power from a main breaker to a subpanel. It can be exposed to direct sunlight and used in wet or dry locations.

• SE-R: Twisted together with a bare ground, SE-R is used to bring service from the panel to other panels in multiple-unit dwellings and in SE-U purposes.
• SE-U: Bare conductor strands are helically wound about the two paralleled insulated conductors. It&#;s used for single-family residential buildings to convey power from the service drop to the meter base and from the meter base to the distribution panel board.

Speaker Wire: Made of copper and designed to transport a low-voltage electrical current, speaker wire has a variety of wiring uses, including doorbells, thermostats, home security sensors, landscape lighting and other low-current systems. 

Sprinkler Wire: Multi-conductor sprinkler wire is suitable for direct burial on applications up to 30 volts. It&#;s used in central controls for underground sprinkler systems and is available in 18-gauge construction with up to 25 conductors.

Submersible Pump Cable: This includes THWN copper conductors that are heat-, moisture-, oil- and gasoline-resistant. It&#;s suitable for temperatures below 75 degrees Celsius with two or three conductors. It&#;s used for power and circuits for submersible pump systems.

Thermostat Wire: Used in heating and air conditioning systems, along with bell and alarm systems, thermostat wire is available in 20- or 18-gauge sizes with up to 10 conductors.

Underground (UF-B) Wire: A copper wire used for underground purposes, including direct burial, it comes in a gray jacket and can be used for deck lighting, outdoor water features, landscape lighting and air conditioner compressors.

Underground Residential Distribution (URD) Cable: Used for secondary distribution and underground service applications at 600 volts or less, it&#;s suitable for direct burial or placement in ducts. It&#;s acceptable in wet locations in triplex or quadruplex. Conductors are stranded, compressed aluminum. The neutral conductor has a yellow, triple-extruded stripe.

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