Which type of conductor is recognized by the NEC?

The National Electrical Code (NEC) recognizes various types of conductors, each designated for specific applications and environments. Type NM (Non-metallic sheathed cable) is commonly used for residential wiring in dry locations due to its affordability and ease of installation. It consists of two or more insulated conductors and a bare ground wire, all encased in a non-combustible sheath.

Type NM is particularly fantastic for interior residential applications because it can be easily routed through walls and ceilings, making it convenient for general-purpose lighting and receptacle circuits. The conductor is designed to be flexible and can accommodate bends and turns, which adds to its practical use in typical household wiring scenarios.

Other types listed are indeed recognized by the NEC but serve different purposes. For example, Type UF is designed for underground applications, Type THW for wet and high-temperature environments, and Type SE is intended for service entrance applications. Each of these types has specific attributes that suit them for their intended usage, but Type NM stands out as the common choice for general residential wiring, making it the correct answer in this context.