Which type of conduit must be used for protecting above-ground service-entrance cables?

The use of Schedule 80 PVC conduit for protecting above-ground service-entrance cables is appropriate because this type of conduit offers additional strength and a thicker wall compared to Schedule 40 PVC conduit. Schedule 80 is specifically designed for higher pressure applications and is more robust, providing greater resistance against physical damage and environmental factors that may impact above-ground installations.

Conduits are chosen based on the requirements of the installation environment, and above-ground service-entrance cables are often exposed to various external conditions such as UV radiation, moisture, and other elements that could cause degradation over time. Schedule 80 PVC conduit’s durability and enhanced protection make it a suitable choice for these applications, ensuring that the cables inside remain safe and functional.

The other types of conduits may not provide the same level of protection. Flexible conduit is typically used for applications that require frequent movement or adjustment. Sch. 40 PVC conduit, while it can be used in various electrical applications, does not possess the same thickness and strength as Sch. 80, making it less ideal for above-ground service entrances where additional protection is warranted. Metal conduit, while strong, may not have the necessary insulating properties required for certain installations, depending on the local electrical code and environmental conditions.