Which type of cable is suitable for direct burial in the earth?

UF (Underground Feeder) cable is specifically designed for direct burial applications in the ground. The construction of UF cable includes a durable moisture-resistant material that protects the conductors from water and soil exposure, making it ideal for outdoor use where it may be buried directly in the earth.

This cable is designed to withstand the harsh conditions typically found underground, such as moisture and potential chemical exposure from the surrounding soil. In addition to being rated for direct burial, UF cable can be used for various outdoor applications, including powering outdoor lighting and other electrical systems that do not require a conduit for protection.

In contrast, other types of cables mentioned have specific uses that do not include direct burial applicability. For example, MC (Metal Clad) cable is generally used indoors or in protected environments and requires additional protection when used outside. AC (Armored Cable) also is not specified for direct burial and is primarily used in building structures. NM (Non-Metallic Sheathed Cable) is not designed for exposure to moisture and should always be protected, thus is not suitable for direct burial either.