Which type of cable is generally used for underground feeder applications?

The type of cable generally used for underground feeder applications is UF-B, or Underground Feeder cable. This cable is specifically designed for direct burial in the ground, which makes it well-suited for outdoor installations. UF-B cable is constructed with a moisture-resistant plastic jacket that provides protection against damp conditions, making it durable in underground environments.

Moreover, UF-B cable can be used for various applications, including powering outdoor lighting, barns, and other structures, that may not have direct access to electrical sources without going underground. The insulation and construction of UF-B cables ensure they are safe and reliable for such applications, adhering to the necessary building codes and safety standards for buried electrical wiring.

In contrast, other types of cables like NM-B (Non-Metallic Sheathed Cable) are intended for indoor use only and do not provide the moisture resistance required for underground installation. THHN (Thermoplastic High Heat-resistant Nylon-coated) cable, while useful for conduits, is not rated for direct burial either. AC (Armored Cable) is generally used for indoor applications and exposed locations and does not meet the requirements for underground feeder installations.