What is the proper term for "Romex" cable that is not actually of that brand?

The term "Romex" is a common name that refers to non-metallic sheathed cable, specifically one that is commonly manufactured by the Southwire Company. However, the generic or proper term for this type of cable is Type NM cable (Non-Metallic). Type NM cable is designed for dry locations and typically contains two or more insulated conductors and a bare ground wire, all encased in a plastic sheath.

Understanding the various types of electrical cables is crucial in electrical work. Type THHN refers to a specific type of insulated wire typically used in commercial and industrial applications and is not non-metallic sheathed cable. Type UF cable is designed for underground use, and while it is also non-metallic, it serves a different purpose compared to regular indoor wiring. Type NMD cable is a designation used primarily in Canada for non-metallic sheathed cable and is not commonly used in the U.S.

Thus, Type NM cable is the correct term to reference "Romex" cables generically, providing clarity in both discussions and applications in electrical installations.