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When choosing speaker wire, consult the manufacturer's instructions closely. Many speaker manufacturers will specify choosing larger gauge wire if running longer distances of wire or wiring up higher-ohm systems. When you're installing new wiring, choosing the right wire or cable is half the battle. The function of a cable depends upon the type of cable. An electrical wire is a type of ­conductor, which is a material that conducts electricity. Electrical wire is typically made of copper or aluminum, and these conductive materials are insulated as wires that bring electricity to various parts of your home. Unlike NM cable, in which two or more individually insulated conductors (copper or aluminum) are bundled inside a plastic sheathing, THHN and THWN wires are single conductors, each with its color-coded insulation. This type of electrical wire is also a bit more expensive than NM wire because of its durable insulation. The most commonly used telephone and data wires are Cat 5 (category 5) cable and its more modern counterpart Cat 6, which can be used for both phone and data transmission and offer greater capacity and quality than standard phone wire.

Instead of being protected by NM cable sheathing, these wires are protected by tubular metal or plastic conduit. As an alternative to NM cable, individual wires can be installed inside of a rigid or flexible metal or plastic tubing called conduit. It consists of two or more individual wires wrapped inside a protective plastic sheathing. Electrical cables may be made more flexible by stranding the wires. Telephone cables may contain four or eight wires, while ethernet cables (internet connection) consist of eight wires arranged in four twisted pairs. Telephone and data wiring are low-voltage wires used for landline phones and internet connections, typically made from copper. While still used today, it's beginning to grow less common thanks to the use of other forms of data wiring, such as HDMI, for television data transmission. In the film industry and on a television crew the head electrician is referred to as a Gaffer.

An auto electrician is a tradesperson specializing in electrical wiring of motor vehicles. When examining the old wiring in your home, identifying the wire type can tell you a lot about the circuit the wiring belongs to (for example, if you open a junction box and need to determine which wires go where). One of the purposes of armored cable's metal jacket is to eliminate the need for conduit, as the wire has its protective layer. In the case of household wiring, the conductor itself is usually copper or aluminum (or copper-sheathed aluminum) and is either a solid metal conductor or stranded wire. Armored Cable Cutters: Commonly referred to by the trademark 'Roto-Split', is a tool used to cut the metal sleeve on MC (Metal Clad) cable. UF cable is also used for major circuit wiring and can carry a dangerous amount of voltage when the circuits are turned on. The minuscule amount of voltage carried by coaxial cable signals makes it very unlikely to cause a shock of any type-provided the cables are not in contact with another source of current.

UF cable is normally sold with gray outer sheathing. Gray sheathing is not used for NM cable but is reserved for underground (UF) cable or service entrance cable (SE or SER). Orange sheathing indicates NM cable with 10-gauge conductors. Yellow sheathing indicates NM cable with 12-gauge conductors. White sheathing indicates NM cable with 14-gauge conductors. NM cable usually contains one or more "hot" (current-carrying) wires, a neutral wire, and a ground wire. Like standard NM cable, UF contains insulated hot and neutral wires, plus a bare copper ground wire. One notable exception is ground wires, which are typically solid copper and are either insulated with green sheathing or uninsulated (bare). Low-voltage wires typically are insulated and may be contained in cable sheathing or combined in twisted pairs, similar to lamp cord wire. Twin-lead - This type of cable is a flat two-wire line. There is no difference between the two wires electrically speaking, but one or both wires will often feature some type of marking to make them more easily traceable over a distance. In this process, smaller individual wires are twisted or braided together to produce larger wires that are more flexible than solid wires of similar size. In the United States, power transmission is, variously, 230 kV to 500 kV, with less than 230 kV or more than 500 kV as exceptions.

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