What type of wiring is commonly used for residential electrical installations?

Non-metallic sheathed cable, commonly referred to as NM cable or Romex, is widely used in residential electrical installations due to its combination of flexibility, ease of installation, and cost-effectiveness. This type of wiring consists of multiple conductors insulated with a non-metallic sheath that provides protection against environmental factors and physical damage. It is ideal for use in dry, indoor environments typical of homes, allowing electrical circuits to be easily routed throughout various fixtures and appliances.

The construction of NM cable includes both hot and neutral conductors, along with a ground wire, allowing for safe and compliant residential wiring. It is specifically designed to be used in walls, ceilings, and floors of homes, adhering to safety codes and providing sufficient insulation to prevent electrical hazards.

Other types of wiring, while valuable in specific circumstances, are not as prevalent in standard residential settings. Metal conduit and armored cable, for instance, offer additional mechanical protection and are often used in commercial or industrial applications rather than typical home environments. Twisted pair cable is primarily utilized for telecommunications and data transfer rather than electrical installations. Hence, NM cable stands out as the preferred choice for residential electrical wiring applications.