What is a nonmetallic-sheathed cable commonly known as?

A nonmetallic-sheathed cable is commonly referred to as NM cable or Romex. This type of cable is widely utilized in residential wiring due to its ease of installation and cost-effectiveness. The "NM" stands for nonmetallic, indicating that the outer sheath is made from plastic instead of metal, which is typical in other cable types. Romex is actually a brand name that has become synonymous with NM cable in many regions, but it is important to recognize that NM is the official designation as per the National Electrical Code (NEC).

This type of cable typically contains two or more insulated conductors along with a bare ground wire housed together in a nonmetallic sheath. NM cable is suitable for dry locations and is designed for use in building structures, making it a favorable choice for residential applications. Its design also provides protection against physical damage and moisture, as required by specific building codes.

Understanding this terminology is vital for anyone dealing with electrical installations, ensuring accurate communication and compliance with regulations.