Covers several types of high-density polyethylene (HDPE) conduit for use in providing a protective raceway for electrical cables buried underground. The HDPE conduit types in this specification can be installed direct buried or concrete encased. They are: EPEC-17 - HDPE This type represents the nominal dimensions for HDPE conduit as specified by ASTM D 3035, SDR 17 and UL 651B or UL1990 for CIC. EPEC-13.5 - HDPE This type represents the nominal dimensions for HDPE conduit as specified by ASTM F 2160, SDR 13.5 and UL 651B or UL 1990 for CIC. EPEC-40 - HDPE This type represents the nominal dimensions for HDPE conduit as specified by ASTM F 2160, Schedule 40 and UL 651B or UL 1990 for CIC. EPEC-80 - HDPE This type represents the nominal dimensions for HDPE conduit as specified by ASTM F 2160, Schedule 80 and UL 651B or UL 1990 for CIC. EPEC-11-HDPE This type represents the nominal dimensions for HDPE conduit as specified by ASTM F 2160, SDR 11 and is not currently covered by UL.