When are trench shields required to be used in excavation?

Trench shields are required when the trench depth exceeds 5 feet primarily due to the increased risk of cave-ins at greater depths. The Occupational Safety and Health Administration (OSHA) provides guidelines indicating that protective systems, such as trench shields, must be used in these situations to protect workers. Trench depths greater than 5 feet pose a significant risk of collapsing walls, thereby necessitating the use of these safety devices to prevent potentially fatal accidents.

Utilizing trench shields in deeper excavations helps create a secure environment where workers can perform their tasks without exposure to hazardous conditions. The requirement for shielding at this depth is a crucial safety measure that reflects the dangers associated with excavation work, emphasizing the importance of following safety regulations to protect lives on the job site.