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Tier Rated Underground Enclosures™ (TRUE)

Amphenol has achieved a major breakthrough in material science as applied to grade level enclosures. Utilizing a process first proven and perfected in the manufacture of wind turbine blades, marine vessels and aircraft, Amphenol has developed an Advanced Composite Material (ACM) formulation that, when molded, provides superior performance and integrity exceeding industry tier loading standards. Through the use of its proprietary ACM formulation, Amphenol has developed grade level enclosures that are certified to meet and exceed all the requirements of ANSI/SCTE-77, including Tier 15 and Tier 22 loading. The revolutionary aspect of all of this performance is that it is accomplished while weighing up to 50-75% less than equivalent usable volume polymer concrete alternatives.

The exterior surfaces of TRUE are finished with gelcoat, which cures to a durable, smooth finish resistant to ultraviolet degradation and hydrolysis. TRUE grade level enclosures are available in two standard colors, Utility Green or Graystone. The molding process is flexible for color customization for unique branding or identification requirements, please call for custom lid color options.

TRUE 15 and TRUE 22 Series grade level enclosures meet and exceed the Society of Cable Telecommunications Engineers’ ANSI/SCTE-77 2013 “Specification for Underground Enclosure Integrity” Tier 15 Rated Loadings, while TRUE 22 Series enclosures meet and exceed Tier 22 Rated Loadings. ANSI tier loading designations establish minimum industry specifications for the safe and reliable performance of underground/grade level enclosures. Tier loadings measure supported weight loads and maximum deflection, both laterally and vertically.

Product Gallery:


  • Designed to meet or exceed ANSI/SCTE-77 Tier 15 ratings (TRUE 15 Series) or Tier 22 ratings (TRUE 22 Series) for various traffic applications
  • Structurally rugged, non-metallic advanced composite material construction produces enclosures that are durable, lightweight, easy to install, and resistant to chemicals and water
  • Tapered wall sides create maximum usable interior space
  • Interior walls can support splice case and other mounting brackets using epoxy adhesive kits
  • Deep well bottom edges provide long-term stability in grade level placements
  • Units are available in two standard molded-in colors: Utility (Munsell) Green and Graystone,

    with many other special-order colors available

  • Stainless steel hardware, including hex-head or penta head bolts
  • Integrated EMS detection available

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