What type of wire is typically used for residential branch circuits?

THHN wire is the correct choice for residential branch circuits because it is a type of thermoplastic high-heat-resistant nylon-coated wire that is commonly used in electrical wiring applications. This wire is designed to be durable and flexible, making it suitable for a variety of indoor and outdoor installations. THHN wire has excellent resistance to heat and moisture, which is essential for the safety and longevity of electrical circuits in residential settings.

In residential branch circuits, THHN wire is typically used in conduit systems and can handle the standard voltage levels encountered in homes. Its versatility allows it to be used for both general-purpose wiring and in specialized applications, ensuring reliable performance in different environments.

Other options like FEP wire are specialized for specific industrial applications and not suited for general residential wiring. Coaxial cable is primarily used for cable television and internet connections, and fiber optic cable is used for high-speed data transmission, not for power distribution. These types of wires do not meet the requirements for standard electrical branch circuits in a home.