What is the minimum depth required for drop cables according to the National Electrical Safety Code (NESC)?

The National Electrical Safety Code (NESC) specifies that the minimum depth for drop cables, especially when they are buried to provide protection against physical damage and weather, is 18 inches. This depth is established to ensure that the cables are adequately protected and insulated from potential damage caused by surface activities such as digging or plowing.

Choosing this depth helps to reduce the risk of accidental cuts or breaks in the cable, as well as protecting it from environmental factors that could cause wear over time. The regulations are designed with safety and long-term durability in mind, ensuring that both the infrastructure and the surrounding environment are protected.

While other depths are mentioned in common practices or might be appropriate for different applications, the NESC clearly mandates 18 inches as the minimum standard for drop cables to ensure compliance and safety.