Which action is essential to prevent trench collapse during excavation near plumbing work?

• A. Inspect soil
• B. Use shoring or trench boxes
• C. Provide escape routes
• D. Keep loads away

Answer: (B)

Protecting trench walls against collapse requires installing a protective system that physically supports the soil. Using shoring or trench boxes directly stabilizes the sides, preventing cave-ins and keeping the trench safe for workers near plumbing lines. While inspecting soil, providing escape routes, and keeping loads away are important safety practices, they do not by themselves provide the structural support needed to stop a trench from collapsing.