What is the minimum burial depth for direct burial cable protected by a 120-volt, 20-ampere GFCI breaker?

The minimum burial depth for direct burial cable typically depends on the type of cable and the conditions of its usage. In the context of a 120-volt, 20-ampere system that is protected by a Ground Fault Circuit Interrupter (GFCI) breaker, the National Electrical Code (NEC) provides guidelines that require such cables to be buried at a minimum depth to ensure safety and protection from physical damage.

For direct burial cables that are not placed in conduit, the NEC generally mandates a minimum burial depth of 12 inches. This depth is designed to reduce the risk of accidental contact with the cable and to protect it from environmental factors, such as soil movement and moisture, which could potentially compromise the cable's integrity.

While other options suggest depths that are either greater or lesser, the specific requirement for this scenario highlights that 12 inches is the appropriate minimum depth for cables intended for residential and similar applications when a GFCI is involved, reinforcing safety while complying with recognized electrical standards.