For excavations over two meters in depth, how many ladders are required per three meters of depth?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: (B)

Ladders are provided so workers can safely climb out of deep excavations. When the depth goes beyond two meters, the rule requires a ladder for each three-meter vertical segment. So the depth is effectively divided into three-meter increments, each needing its own ladder. That means a depth of just over two meters already starts the first three-meter segment, giving you one ladder, and if the depth increases to six meters, you would need two ladders, and so on. Therefore, the required number is one ladder for every three meters of depth.