UL 1990 PDF

1 Scope

1.1 These requirements cover nonmetallic underground High Density Polyethylene (HDPE) conduit with conductors. These products consist of a factory assembly of conductors or cables inside a coilable, smooth-wall, continuous length conduit with a circular cross section. The conduit is Schedule-40, Schedule-80, EPEC-9, EPEC-11, EPEC-13.5 or EPEC-A conduit in trade sizes 1/2 (16) – 4 (103). This product is intended for installation in accordance with the National Electrical Code, NFPA 70. The values in parentheses are metric trade designators of conduit. The designations Schedule-40, Schedule-80, EPEC-9, EPEC-11, EPEC-13.5, and EPEC-A refer to conduit having specific outside diameters and wall thicknesses.

1.2 HDPE conduit material, dimensions and performance requirements are defined with reference to UL 651A. Requirements specific to conduit with conductors are included in this standard.

1.3 This product is for aboveground use where encased in not less than 2 inches (51 mm) of concrete and for underground use by direct burial or encasement in concrete.

Summary of Topics

This revision of ANSI/UL 1990 dated January 3, 2024 includes the following changes in requirements:

– Referenced Publication Correction; Section 2, Section 2A

– Unit Conversion Error; Section 9.1