What type of wiring is characterized by its insulated conductors?

The correct choice, non-metallic sheathed cable, is characterized by its insulated conductors, which are enclosed within a plastic sheath. This type of wiring typically includes multiple insulated wires bundled together for protection and ease of installation in residential and commercial applications. The insulation surrounding each conductor helps to reduce the risk of electrical shock and protects against short circuits, making it suitable for a variety of electrical applications.

Non-metallic sheathed cable, often referred to by brand names such as Romex, is popular for its lightweight, flexibility, and ease of use, allowing for faster installation compared to other types of wiring. The insulation also improves the durability of the wires and helps to prevent moisture from causing corrosion or electrical failures.

While the other cables mentioned have their own characteristics, they either include metal shielding or a specific wiring structure not focused solely on insulated conductors in a bundled format like non-metallic sheathed cable does. For example, armored cable has a metallic protective layer, twisted pair cable is typically used for data transmission and has pairs of wires twisted together, and coaxial cable consists of a central conductor, insulation, and a metallic shield which is not as relevant to the characteristic of insulated conductors in the same manner as non-metallic sheathed cable.