Service-entrance cables exposed to physical damage must be protected by which type of conduit?

Service-entrance cables that are exposed to potential physical damage require a higher level of protection than standard conduits can provide. Schedule 80 PVC conduit is specifically designed for applications where additional strength and impact resistance are needed, making it appropriate for areas where physical damage could occur. It features a thicker wall than Schedule 40 PVC, providing enhanced durability against various types of forces and impacts.

Using Schedule 80 PVC conduit ensures that the conductors within are adequately shielded, thus maintaining the integrity of the electrical system and ensuring safety. In contrast, other types of conduit such as Schedule 40 PVC may not offer the same level of protection in high-risk environments, and flexible conduit does not provide the rigid protection necessary in these situations. Non-metallic conduit, while useful for certain applications, may lack the impact strength required in exposed locations. The requirement for protection from physical damage underscores the importance of selecting the appropriate conduit to ensure compliance with safety standards and electrical codes.