What type of wire is typically used for light fixtures in residential wiring?

The use of Romex wire, particularly in residential wiring, is standard practice for light fixtures and other general electrical applications. Romex is a brand name for a type of non-metallic sheathed cable, which typically contains multiple conductors insulated within a plastic outer sheath. This design simplifies installation and provides adequate protection for the conductors.

Romex is commonly used because it is versatile, cost-effective, and suitable for both indoor and outdoor applications when properly rated. It's designed for use in dry locations and is suitable for various residential settings, such as connecting light fixtures to electrical boxes.

The other types of wires mentioned have specific uses that do not align with general residential wiring for light fixtures. Ground wire is essential for safety but does not carry current for lighting purposes. Twisted pair wire is primarily used in telecommunications and networking rather than in standard electrical installations. Coaxial cable is typically used for cable television and internet connections, not for powering light fixtures. Thus, Romex wire is the ideal and correct choice for this application.