What is the most common descriptor of NM cable?

The most common descriptor of NM cable, or non-metallic cable, is plastic-insulated wires. NM cable is designed for residential and light commercial electrical wiring applications, and it features a flexible sheath made of plastic, which encases insulated conductors. This plastic insulation serves several important purposes: it protects the conductors from physical damage, provides electrical insulation, and helps to prevent moisture intrusion.

The use of plastic for insulation allows NM cable to remain lightweight and easy to handle during installation compared to other types of cable, such as metal-sheathed wires. The plastic sheathing also provides a level of moisture resistance, making it suitable for dry, indoor environments. The characteristics of NM cable, including its composition and design, make it ideal for a variety of typical household electrical installations.