Created with Sketch. Created with Sketch.

Shop by Category

Load Ratings for Underground Pull Boxes

Determining Proper ANSI Load Ratings for Underground Pull Boxes

Determining the proper load ratings for underground pull boxes is critical to ensuring public safety. The following information will help you understand what factors to consider in choosing the proper traffic rating for pull boxes and covers.  Should you have any questions, please call GUS at 800-245-8339.

Traffic Type

ANSI 77 sets forth 6 types of traffic for load ratings. Consider each of these when determining which tier rating is needed for your project. 

Light Duty: Pedestrian traffic only.
Example: grassy areas in residential properties that are located away from vehicular traffic.

TIER 5: Sidewalk applications with a safety factor for occasional non-deliberate vehicular traffic.
Example: Residential sidewalk that is not crossed by a driveway. 

TIER 8: Sidewalk applications with a safety factor for non-deliberate vehicular traffic.
Example: Most public sidewalks
Example: Within parking curbs of parking lots where it is highly unlikely to be run over. 

TIER 15: Driveway, parking lot, and off-roadway applications subject to occasional non-deliberate heavy vehicular traffic.
Example: Sidewalks in residential or public areas where heavy vehicle traffic is unlikely, but may occur.

TIER 22: Driveway, parking lot, and off-roadway applications subject to occasional non-deliberate heavy vehicular traffic. 
Example: Non-paved median between a divided highway or non-paved shoulder area. 

AASHTO H-20: Deliberate vehicular traffic applications. 
Example: Within streets, highways and paved shoulders along highways. 

 tier-rating.jpg

There are no products listed under this category.