Excavator Operator Certification Exam Prep · Question
When heavy equipment is operating near an excavation, what measure should be taken to mitigate the risk of trench collapse due to vibration and surcharge?
Heavy equipment vibrations and the weight (surcharge) can significantly destabilize trench walls. Maintaining a safe setback or installing shoring systems desig
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Question: When heavy equipment is operating near an excavation, what measure should be taken to mitigate the risk of trench collapse due to vibration and surcharge?
Answer options: ✅ Maintain a safe distance from the trench edge for equipment, or use shoring designed for additional loads.
- Operate the equipment at maximum speed to minimize exposure time.
- Only allow foot traffic near the trench during equipment operation.
- Increase the trench depth to absorb vibrations.
Correct answer: Maintain a safe distance from the trench edge for equipment, or use shoring designed for additional loads.
Explanation: Heavy equipment vibrations and the weight (surcharge) can significantly destabilize trench walls. Maintaining a safe setback or installing shoring systems designed to withstand these loads is essential to prevent collapse, as per WorkSafeBC G20.94 and Ontario Reg 213/91 (s. 233(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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