What type of conductor is typically used for residential wiring?

Non-metallic sheathed cable (NM) is commonly used for residential wiring due to its versatility, ease of installation, and cost-effectiveness. NM cable, also known as Romex, consists of two or more insulated conductors and often a bare ground wire, all encased in a non-metallic sheath. This design provides excellent insulation and protection for the wires, making it suitable for indoor use in homes.

One of the key advantages of NM cable is its lightweight nature, which simplifies handling and installation in walls, ceilings, and floors. Additionally, the non-metallic sheath allows for the cable to be easily cut and manipulated, enabling electricians to work efficiently in a variety of residential layouts.

In contrast, armored cable, while providing sturdy protection, is generally used in applications where additional mechanical protection is necessary, and its installation can be more labor-intensive. Metal conduit wiring offers robust shielding against physical damage and electromagnetic interference, but it tends to be more expensive and labor-intensive to install, making it less ideal for standard residential wiring needs. Flexible cord wiring is typically reserved for portable applications and is not suitable for fixed installations in residential structures.

These characteristics collectively make non-metallic sheathed cable the preferred choice for most residential wiring projects.