Excavator Operator Certification Exam Prep · Question
An excavator operator is using a trench box that is 2.4 metres long. The trench requires workers to enter for pipe installation that will cover a length of 15 metres. How should the trench box be advanced to ensure continuous protection?
CSA Z248 and OHS guidance recommend that when using a trench box, excavation ahead of the box should be minimized, typically not exceeding 0.6 metres (2 feet) t
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Question: An excavator operator is using a trench box that is 2.4 metres long. The trench requires workers to enter for pipe installation that will cover a length of 15 metres. How should the trench box be advanced to ensure continuous protection?
Answer options:
- Advance the box 15 metres at once and then backfill.
- Excavate the entire 15-metre trench, then place the box and work from one end. ✅ Excavate ahead of the box by no more than 0.6 metres, then pull the box forward.
- Backfill one end of the box while excavating to advance the other end simultaneously.
Correct answer: Excavate ahead of the box by no more than 0.6 metres, then pull the box forward.
Explanation: CSA Z248 and OHS guidance recommend that when using a trench box, excavation ahead of the box should be minimized, typically not exceeding 0.6 metres (2 feet) to ensure continuous protection while advancing.
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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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