What is the minimum cover required for polyethylene and polyamide piping installed outside and underground?

The minimum cover required for polyethylene and polyamide piping installed outside and underground is indeed 12 inches. This requirement is established as a safety measure to ensure adequate protection from physical damage that could be caused by surface activities, such as vehicle traffic or ground movement. Proper cover also helps prevent temperature fluctuations and provides insulation against external environmental conditions.

While other cover depths may be relevant in various contexts or with different piping materials, the specific 12-inch requirement for polyethylene and polyamide piping is designed to strike a balance between safety, material integrity, and practical installation. Understanding these requirements is crucial for ensuring the longevity of the system and minimizing risks associated with underground installations.