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UL 1990

3rd Edition, January 20, 2017

Complete Document

UL Standard for Safety Nonmetallic Underground Conduit with Conductors

Includes all amendments and changes through Revision Page(s) , January 20, 2017

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Product Details:

  • Revision: 3rd Edition, January 20, 2017
  • Published Date: January 20, 2017
  • Status: Active, Most Current
  • Document Language: English
  • Published By: UL (UL)
  • Page Count: 25
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

These requirements cover nonmetallic underground 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-A or EPEC-B High Density Polyethylene (HDPE) 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-A and EPEC-B refer to conduit having specific outside diameters and wall thicknesses.

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.