A four-foot deep trench requires an additional ladder for each how many feet of open trench?

For a four-foot deep trench, it is required to have an additional ladder for every 25 feet of open trench. This requirement is in place to ensure the safety of workers operating in deeper excavations. The provision of ladders at appropriate intervals allows workers to safely enter and exit the trench, reducing the risk of accidents and ensuring quick access in case of an emergency.

The specific depth of the trench (in this case, four feet) indicates that the regulations are set to increase safety measures as the depth increases. By providing a ladder every 25 feet, it helps maintain a safe working environment, adhering to safety standards and regulations set forth by occupational safety organizations. This practice is vital for minimizing hazards associated with trench work, including the risk of cave-ins and falls.

Therefore, the requirement for an additional ladder for every 25 feet of open trench is an important aspect of excavation safety protocols.