Excavator Operator Certification Exam Prep · Question
What is the primary purpose of a trench box (trench shield) in excavation work?
A trench box (or trench shield) is designed to protect workers inside the excavation from the hazards of a cave-in by creating a protective workspace (CSA Z275.
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Question: What is the primary purpose of a trench box (trench shield) in excavation work?
Answer options:
- To provide a stable platform for equipment to operate on.
- To prevent water accumulation in the trench. ✅ To protect workers inside the trench from cave-ins.
- To improve the aesthetic appeal of the construction site.
Correct answer: To protect workers inside the trench from cave-ins.
Explanation: A trench box (or trench shield) is designed to protect workers inside the excavation from the hazards of a cave-in by creating a protective workspace (CSA Z275.5-12, Section 5.3.1).
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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