OSHA 30 Hour Construction Program Practice Test

What is the minimum depth at which workers should not enter an unprotected trench without an adequate protective system?

1. 3 feet

2. 4 feet

3. 5 feet

4. 6 feet

The correct answer is: 5 feet

The minimum depth at which workers should not enter an unprotected trench without an adequate protective system is 5 feet. This standard is in place because trenches can easily collapse, and the risk of injury or fatality increases significantly as the depth of the trench increases. OSHA regulations specify that a protective system must be implemented for trenches that are 5 feet deep or greater, as at this depth the hazard of a cave-in becomes a serious concern. An adequate protective system could involve the use of trench boxes, shoring, or other methods designed to prevent soil from moving and ensure the safety of workers inside the trench. This requirement is crucial for preventing accidents and protecting the health and safety of employees working in excavation sites. Working in trenches less than 5 feet deep may still pose risks; however, the specific legal requirement for protective systems is established at 5 feet to provide a clear guideline for safety practices in construction operations.