This standard covers the following types of electrical polyvinyl chloride (PVC) conduit (EPC-40 and EPC-80). The designations "40" and "80" refer to Schedules 40 and 80, respectively, of iron pipe dimensions. EPC-40-PVC -Electrical PVC conduit designed for normal-duty applications above ground; also used for all concrete encased applications or direct burial. EPC-80-PVC -Electrical PVC conduit designed for heavy-duty (areas of physical damage) applications above ground; also used for all concrete encased applications or direct burial. NOTE -The values stated in U.S. customary units are to be regarded as the standard.