What is a common name for type-NM cable?

Type NM cable, commonly referred to as Romex®, is a popular electrical wiring option used in residential settings. The name Romex® is a trademark owned by Southwire Company, and it has become synonymous with this type of non-metallic sheathed cable. Type NM cable is recognized for its ease of installation, flexibility, and suitability for a variety of indoor residential applications where it is not exposed to moisture.

Romex® consists of multiple insulated conductors housed within a non-metallic sheath, which provides protection while allowing for flexibility during installation. It is primarily used for light and power circuits within walls, ceilings, and floors.

The other choices mentioned are distinct types of wiring or cable. For example, aluminum wire is specifically made of aluminum and is commonly used in some electrical applications but does not refer to NM cable. Armored cable is a type of wiring that includes a protective metallic sheath, which differs significantly from the non-metallic sheath of NM cable. Knob-and-tube cable is an older wiring method that is no longer code-compliant in many areas and consists of individual wires run through ceramic knobs and tubes, thus not being related to NM cable in modern contexts.