What is the recommended depth for underground feeder (UF) cable?

The correct depth for underground feeder (UF) cable is indeed 24 inches below ground for direct burial. This depth is specified in the National Electrical Code (NEC) to ensure the safe installation of electrical wiring where it may be subjected to physical disturbance or environmental conditions.

Burial depth is critical for protecting the cable from accidental damage and environmental factors. The 24-inch depth requirement allows for sufficient coverage to minimize the risk of damage from soil movement, such as from landscaping or digging. It also helps ensure that the cable is well within the frost line in many areas, reducing the risk of frost damage.

In contrast, other depths listed might not provide adequate protection based on safety standards and industry recommendations. The NEC guidelines are in place to standardize electrical installations to promote safety and functionality in residential wiring projects.