A residential wiring system typically uses what type of cable?

In a residential wiring system, nonmetallic-sheathed cable, often known as NM cable or Romex, is commonly used because it is designed for general wiring and meets the specific needs of residential environments. This type of cable is lightweight, flexible, and easy to install, making it ideal for running electrical circuits in homes.

Nonmetallic-sheathed cable contains insulated conductors protected by a nonmetallic sheath, which provides a degree of protection against moisture and physical damage. Additionally, its design allows for greater ease of handling and installation in various residential applications, such as walls, ceilings, and attics.

Other options, like metal-clad cable and armored cable, are more suited for commercial or industrial applications where additional protection from physical damage and moisture is necessary. Flexible conduit, while useful for certain applications, does not offer the same level of convenience or use for general residential wiring as nonmetallic-sheathed cable does.