UL 1990 Nonmetallic Underground Conduit with Conductors

standard by Underwriters Laboratories, 04/30/1998

Full Description

Please note: All interim revisions for this edition available at time of your purchase will be included.



1.1 These requirements cover nonmetallic underground conduit with conductors. These products consist of a factory assemblyof conductors or cables inside a coilable, smooth-wall, continuous length conduit with a circular cross section. Theconduit is Schedule-40, Schedule-80, EPEC-A or EPEC-B High Density Polyethylene (HDPE) in trade sizes < (16) 4 (103). Thisproduct is intended for installation in accordance with the National Electrical Code, NFPA 70. The values in parenthesesare metric trade designators o f conduit. The designations Schedule-40, Schedule-80, EPEC-A and EPEC-B refer to conduithaving specific outside diameters and wall thicknesses.

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

1.3 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involve a risk of fire, electric shock, or injury to persons shall beevaluated using the appropriate additional component and end-product requirements as determined necessary to maintain theacceptable level of safety as originally anticipated by the intent of this standard. A product whose features,characteristics, components, materials, or systems conflict with specific requirements or provisions of this standardcannot be judged to comply with this standard. Where considered appropriate, revision of requirements shall be proposed andadopted in conformance with the methods employed for development, revision, and implementation of this standard.

Product Details

Edition: 1st Published: 04/30/1998 Number of Pages: 20