UL 2420
Belowground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings

Edition Number:1SCC Approved:--
Edition Date:2009-07-30DOD Approved: --
Price Code:BANSI Approved: 2016-12-16


    1 Scope

    1.1 This Standard specifies the requirements for low-halogen belowground (Type BG) reinforced thermosetting resin conduit (RTRC) and fittings, for installation and use in accordance with CSA C22.1,  Canadian Electrical Code (CEC), Part I, and NFPA 70,  National Electrical Code (NEC).

    1.2 The products specified in this Standard are intended for use at -40°C (-40°F) to 110°C (230°F).

    1.3 Type BG conduit has not been evaluated for directional boring applications.

    1.4 This Standard covers ID (dimensions based on inside diameters) and IPS (dimensions based on outside diameters of iron pipe sizes) conduit and fittings. Trade sizes (metric designators) are 1/2 (16) to 6 (155).

    Note: The values in parenthesis are metric size designations of conduits and fittings and do not necessarily reflect metric trade sizes

    1.5 This Standard covers conduit with designations EB (encased burial) and DB (direct burial), which refer to specific wall thicknesses. EB conduit, is suitable for encasement in concrete. DB conduit is suitable for encasement in concrete and direct burial.

    1.6 Fittings specified in this Standard include, but are not limited to, straight couplings, 5° angle couplings, adapters, and elbows with plain ends or integral belled ends at one or both ends.

    Expand All

    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Belowground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings
        • 1 Scope
        • 2 Definitions
        • 3 Reference publications and units of measurement
          • 3.1 Reference publications
          • 3.2 Units of measurement
        • 4 Construction
          • 4.1 General
          • 4.2 Conduit with an integral belled end
          • 4.3 Couplings
          • 4.4 Elbows
          • 4.5 Adapters
        • 5 Qualification tests
          • 5.1 Conditioning
          • 5.2 Compression
          • 5.3 Impact resistance at low temperature
          • 5.4 Water absorption
          • 5.5 Chemical resistance (optional)
          • 5.6 Watertightness
          • 5.7 Joint separation
          • 5.8 Flattening resistance
          • 5.9 Halogen content
          • 5.10 Infrared spectroscopy
          • 5.11 Tensile strength
          • 5.12 Durability of printing (all types with surface-applied markings of ink, dyes, etc.)
        • 6 Marking
    • Annex A(Normative)Method to determine the halogen content of a low-halogen material using the calculation method from pH and acid gas evolution
    • Annex B(informative)Rationale for threaded adapter dimensions for size 4-1/2 (116)