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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. Stranded wires contain a large number of thin solid wires that are wrapped around each other to make a single larger wire. But while sheathing on NM cable is a separate plastic wrap, UF cable sheathing is solid plastic that surrounds each wire. 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. Cables left above ground can suffer weathering and accidents, and can even be purposefully damaged.

NM cable usually contains one or more "hot" (current-carrying) wires, a neutral wire, and a ground wire. 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). Conduit is often used in unfinished areas, such as basements and garages, and for short exposed runs inside the home, such as wiring connections for garbage disposers and hot water heaters. As an alternative to NM cable, individual wires can be installed inside of a rigid or flexible metal or plastic tubing called conduit. Many larger wires in your home carry 120- to 240-volt circuit voltage, often referred to as line voltage, and they can be very dangerous to touch. Several wires in your home carry much lesser amounts of "low-voltage" current. The phase cable is where the electrical current enters, and is the one you must be careful with, given that we are talking about a voltage of 220 or 230 volts. When selecting a cable for a particular electrical application, consideration is also given to the type of current the cable must carry.

Often called "Romex" after one popular brand name, nonmetallic (NM) cable is a type of circuit wiring designed for interior use in dry locations. W - Wet, this wire is also appropriate for dry locations. Underground Feeder (UF) is a type of nonmetallic cable designed for wet locations and direct burial in the ground. The function of a cable depends upon the type of cable. Ribbon cable is a type of wiring where each wire conductor is attached at its side, creating a flat ribbon-like wire. Consider the need for flexibility versus carrying capacity when selecting a wire gauge. NM cable is dangerous to handle while the circuit conductors are carrying voltage. One of the main differences between single and multicore cables is the structural strength of the cable. In Europe, this cable can be described more frequently by using the term multicore. Multicore cable is costlier than single-core cable. Instead of being protected by NM cable sheathing, these wires are protected by tubular metal or plastic conduit.

THHN and THWN are codes for the two most common types of insulated wire used inside conduit. Wire sizes range from about 22 gauge to 12 gauge, and these wires can be made of copper or aluminum. For example, a 2.5mm wire load capacity can hold a voltage of 24A in power circuits, while a 1 mm² flex is used for appliances with a rating of 2300W only. These wires typically have similar prices to NM wire (plus the cost of the conduit). Conduit is typically used where the wiring will be exposed and not hidden inside walls, floors, or ceilings. At the other end of those cables, there will be a vast complex of yet-unbuilt solar panels and wind turbines in the Moroccan desert thousands of miles away. Flat connectors on each end allow the wire to connect at two points while taking up a minimal amount of space.

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