QUAZITE® underground handhole enclosures are designed to meet or exceed the tier loadings set forth in the American National Standards Institute’s ANSI/SCTE 77 2002 “Specification
for Underground Enclosure Integrity”1.
ANSI tier designations are minimum specifications used by the industry to
ensure the safe and reliable performance of underground handhole enclosures.
The ANSI application tier number relates to a nominal design load times 1,000 pounds (i.e.: Tier 8 = 8 x 1,000 lbs. = 8,000 lbs.). All ANSI tier loadings will have a corresponding test load which is 50% greater than the design load. The maximum deflection at the indicated design load shall be 1/2 inch for vertical tests and 1/4 inch per foot of length for lateral tests.
Three Position Testing
A key requirement outlined in ANSI/SCTE 77 2002 is three position testing for enclosures. Three position testing is required to determine how a product will perform in actual use.
In order to qualify a product’s performance, test loading should be performed at the lateral center of the longest sidewall, at the vertical center of the longest sidewall, and at the vertical in the center of the cover. QUAZITE® products
have been tested to each of the three positions as required by ANSI and
all have met or exceeded the requirements.
Fig.4.1 from ANSI/SCTE 77 2002
- Loadings for enclosures meet and exceed ANSI/SCTE
77 Tier 15 test provisions. Loadings for HH covers comply with all test
provisions of ANSI/SCTE 77 except that they have a vertical design load
of 22,500 lbs. with a test load of 33,750 lbs. over a 10” x 20” plate.
- 3 Some QUAZITE® products are currently not
UL Listed. Refer to pg. 15 for a complete listing of products.
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