Florida InterNACHI State Practice Exam

The term "Romex" commonly refers to non-metallic sheathed cable used for residential wiring; however, it specifically pertains to a brand name from Southwire. When discussing "Romex" that is not actually from that brand, it is appropriate to refer to it as Type NM cable, which stands for Non-Metallic Sheathed Cable. Type NM cable is widely used in residential applications for wiring inside buildings. Its structure typically includes two or more insulated conductors and a ground wire, all encased in a flexible, non-metallic sheath. This type of cable is suitable for dry locations and is considered safe for residential use, making it a popular choice among electricians. The other types of cables mentioned serve different purposes. For example, Type UF cable is designed for underground applications, Type SE cable is used for service entrances, and Type THHN is a wire type used primarily in conduit and is rated for use in dry locations. Understanding these distinctions helps clarify why Type NM cable is the correct terminology when referring to "Romex" that is not branded as such.