Which conductor type is commonly used for underground residential services?

Type UF cable, or Underground Feeder cable, is specifically designed for underground installations, making it the most suitable choice for underground residential services. This cable is constructed with a moisture-resistant, durable outer jacket that safeguards the conductors from environmental factors such as moisture and physical damage.

Type UF cable is rated for direct burial, ensuring that it can be buried without additional conduit in most residential applications. Its ability to withstand underground conditions, including water exposure and soil acids, is crucial for maintaining a safe and reliable electrical service.

Other conductor types mentioned do not have the same level of designation for underground use. For instance, Type NM cable is intended for indoor residential use and lacks the protective qualities required for underground burial. Type MC cable, while versatile and suitable for indoor and some outdoor applications, is typically not intended for direct burial without conduit. Type SE cable is also not designed specifically for underground use; it is primarily used for service entrance applications above ground. Thus, the characteristics and intended use of Type UF cable make it the appropriate choice for underground residential service installations.