Underground Enclosures (UG-22 CA07017E)

NEC and Underground Enclosures The National Electric Code states in article 314.30 that enclosures “...shall be designed and installed to withstand all loads likely to be imposed...” and “addresses issues related to enclosure size, wiring entries, enclosures without bottoms and bonding requirements for covers.” The code references the ANSI/SCTE 77 “Specification for Underground Enclosure Integrity” National Standard, which outlines various tests that enclosures must pass to meet the standard. ANSI/SCTE 77 also provides load charts with Tier ratings to help users determine the appropriate enclosure to select based on the loadings expected in the application. PenCell PenCell DT enclosures with polymer concrete covers meet or exceed the test provisions of ANSI/SCTE 77 2017. To achieve this, PenCell enclosures must pass numerous material and product performance tests before they can meet ANSI/SCTE 77 2017.

Testing Requirements for ANSI/SCTE 77 2017 • Three-Position Load Testing to simulate actual application performance • UV Degradation per ASTM G-154 • Fire Resistance per RUS 7CFR 1755.910 (PE-91)

• Chemical Resistance per ASTM D-543 • Water Absorption per ASTM D-570 • Impact Resistance per ASTM D2444

“K” Rating For projects where Tier Ratings are not required, we offer products that have been tested in our labs to meet 5K, 10K or 20K loads. The K-load testing differs from ANSI/SCTE 77 Tier testing in that the K-load testing is a one-time, vertical cover test to ensure the enclosure can safely withstand the static load. By contrast, the ANSI/ SCTE 77 Tier testing includes cyclic testing of enclosures in three positions: lateral sidewall, vertical sidewall and vertical cover. We carefully test and periodically retest our products to ensure they meet and will continue to meet the demands of their intended use. Currently, there is not a standard for testing enclosures with a “K” load rating designation. No association should be made stating that enclosures with this designation meet the testing requirements of any standard such as ANSI/SCTE 77, WUC 3.6 or any other.

PENCELL

Cover Type

Cover Rating Test Area

Plastic

5K (5,000 lbs)

10” X 10”

Steel 10K (10,000 lbs) 10” X 10” Polymer Concrete 20K (20,000 lbs) 10” X 10”

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