Which type of wiring method is generally used in residential installations?

Nonmetallic sheathed cable, commonly known as NM cable or Romex, is the preferred wiring method for residential installations due to its flexibility, ease of installation, and affordability. NM cable consists of insulated conductors encased in a nonmetallic jacket, which offers protection against environmental factors while remaining lightweight and easy to handle.

Its design allows for straightforward installation in walls, ceilings, and floors, making it ideal for new construction and renovations in homes. Additionally, NM cable is suitable for use in dry locations and complies with the National Electrical Code (NEC) for light residential wiring applications, ensuring that it meets safety standards.

Other wiring methods, while viable in specific situations, are not typically used as the primary wiring method in residential settings. Metal conduit is often utilized for commercial installations or in areas requiring extra protection from physical damage. Underground feeder cable is specifically designed for outdoor applications and direct burial, whereas armored cable is also used in some residential applications but is less common than NM cable due to its greater expense and complexity in installation.