According to OSHA, excavations that reach a depth of what measurement require an adequate protective system?

The Occupational Safety and Health Administration (OSHA) specifies that excavations reaching a depth of 5 feet or more require an adequate protective system. This requirement is designed to ensure worker safety and prevent cave-ins, which can be extremely dangerous.

The rationale for setting the threshold at 5 feet is based on safety data that indicates the risk of serious injury or fatality increases significantly at this depth. Protective systems may include trench boxes, shoring, or sloping, and are essential for effectively managing the hazards associated with excavation work. By mandating protective measures at this depth, OSHA helps to protect workers from potential collapses and related accidents, ensuring a safer work environment in excavation operations.