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Charles Industries, LLC
An Amphenol Company

1450 American Lane
20th Floor
Schaumburg, IL
60173-5492 USA



Tier 15 and 22 Advanced Composite Material Tapered Rectangular Handhole Enclosures

*Typical findings from competitive product comparisons of like-sized fiberglass enclosures with polymer concrete lids conducted 2013.

Charles Industries 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, Charles has developed an Advanced Composite Material (ACM) formulation that, when molded, provides superior performance and integrity exceeding industry tier loading standards during load testing. Through the use of its proprietary ACM formulation, Charles has developed grade level enclosures that meet and exceed Tier 15 and Tier 22 Loading while weighing up to 50-75% less than equivalent useable volume polymer concrete alternatives.

Charles' Tier Rated Underground Enclosures™ (TRUE) are made from advanced composite material using a Resin Transfer Molding (RTM) process. Combining the design flexibility of RTM and the strength of advanced composite materials, TRUE grade level enclosures provide Tier 15 and 22 performance with ease of handling and installation. TRUE grade level enclosures have a tapered wall design that provides greater useable volume compared to competitive polymer concrete cover sizes. The grade level enclosure industry has long focused on product sizes based on cover or lid size. However, the majority of grade level enclosure usages are for bulk volume applications (i.e. cable storage, splicing, drop management, valve control and metering). TRUE grade level enclosures provide more useable volume than competitive models with the same cover size.

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 RTM process is flexible for color customization for unique branding or identification requirements, please call for custom lid color options.

TRUE grade level enclosures meet and exceed the Society of Cable Telecommunications Engineers' ANSI/SCTE-77 2017 "Specification for Underground Enclosure Integrity" Tier 15 and 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.  

TRUE 15 and 22 Series Datasheet (.pdf)

TRUE 15 and TRUE 22 Series Handholes


  • Fiber optic, copper and coaxial slack cable coiling and storage

  • Access to sealed cases (splice cases, repeaters, load coils, SmartCoils™, etc.)

  • Meter boxes / Junction boxes / Pull boxes 

  • Irrigation system and other waterway control valves / Valve and Hose boxes

  • Traffic and railway signal controls

  • Ground rods

Usable Volume Comparison to Competitive Tier 15 Rated Enclosures 

Freight, Labor and Lifecycle Savings 

Due to weight and design, most concrete and polymer concrete enclosures are not stackable and must be shipped one per pallet. TRUE Series advanced composite materials are significantly lighter and designed with tapered sides to allow stacking. TRUE 15 and 22 Series enclosures can make a BIG difference in freight savings, as up to eight 18"/24" depth enclosures or six 30"/36" depth enclosures may be shipped per pallet (see chart below). 
Model #
Max Units
per Pallet
Pallet Size
Pallet Weight
Pallet Weight
Max. Nested
C173024 (Tier 15) 8 40"x48" 60 684
T173024 (Tier 22) 8 40"x48" 60 732
C243624 (Tier 15) 8 48"x48" 65 993
T243624 (Tier 22) 8 48"x48" 65 1,041
C304836 (Tier 15) 6 48"x62" 80 1,292
T304836 (Tier 22) 6 48"x62" 80 1,352
The savings doesn't end with freight though. At the garage and job site, two technicians can easily lift a TRUE handhole into and out of a pickup flat bed or trailer, and place it in its hole at the work site. No crane or heavy lifting equipment is required, creating further savings on truck rolls and number of technicians needed for placement. The product's light weight also helps prevent worker injuries resulting from lifting and moving heavy concrete enclosures. Because the TRUE Series' advanced composite material and formulation and gelcoat finish does not chip, crumble or crack like concrete, TRUE handholes provide a long service life, resulting in lowest lifecycle costs.
 Ordering Information
Please see Page 4 of the TRUE 15 and 22 Series Datasheet for part number ordering information.  The following table provides a list of sizes and product options currently available, please call (847) 806-6300 for sales support and to inquire about additional sizes or configurations.

Available Depths

Cover Size 18" 24" 30" 36" Tier 15 Tier 22 One-Piece Cover Two-Piece Split Cover 8" Sq. Pedestal 
10" Sq. Pedestal Cut-Out
17"x30"   X     X X X      
24"x36" X X X X X X X X X
30"x48"   X   X X X X X X X
30"x60" X X X X X X


Bolt Options

Bolts and washers are stainless steel. Custom bolt types are available, call customer service for details.

  • Hex-head
  • 7/8" Penta-head
EMS Detection:

Integrated EMS Detection is available.

  • Telephone
  • Power
Nameplate Options

One standard nameplate is included with each assembly, installed in the factory or easily installed in the field. Custom nameplates are available, contact customer service for details.

  • CATV
  • (Blank - Filler)
  • (Empty)
Vault Mount Square Base Pedestal Lid Option

Select Charles Tier-Rated Underground Enclosures (TRUE) are available with a vault mount pedestal lid option for mounting Charles square base vault mount fiber pedestals. Vault mount pedestal lids are available for TRUE 24”x36”x24” and 30”x48”x36” sizes with a split lid design. On these models, a vault mount pedestal can be placed on the half of the split lid that features a cut-out and mounting brackets designed to accept Charles square base, vault mount pedestals. 6”, 8” and 10" diameter pedestals may be placed on the TRUE 24”x36”x24” enclosure, while 8", 10” and 12” diameter pedestals may be placed on the TRUE 30”x48”x36” enclosure. 

TRUE Vault Mount Pedestal Enclosures
Ordering Guide


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