Excavator Operator Certification Exam Prep · Question
When working with a trench box (trench shield), where should workers be positioned during its installation or removal?
Workers must always remain outside the excavation and away from the immediate area of trench box installation or removal to avoid being struck or crushed, as se
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Question: When working with a trench box (trench shield), where should workers be positioned during its installation or removal?
Answer options:
- Inside the trench box, guiding it into place.
- Directly below the trench box, adjusting its position.
- On the spoil pile, observing the operation. ✅ On the surface, outside the potential collapse zone.
Correct answer: On the surface, outside the potential collapse zone.
Explanation: Workers must always remain outside the excavation and away from the immediate area of trench box installation or removal to avoid being struck or crushed, as serious injury or fatality could occur (CSA Z275.5-12, Section 5.3.3.3).
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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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