wichita.edu
…ladder, non-adjustable in length, with flat steps and a hinged base. Top Cap --- The uppermost horizontal member of a portable stepladder. Top Step --- The first step below the top cap of a portable stepladder. Where a ladder is constructed without a top cap, the top step is the first step below the top of the rails. Working Length --- The length of a…
https://www.wichita.edu/services/environmental_health_and_safety/Safety/ladder_safety_program.php