Excavator Operator Certification Exam Prep · Question
When trenching in unstable soil conditions, what is the safest and most effective method to prevent cave-ins, according to Ontario Regulation 213/91?
Ontario Regulation 213/91, Section 234(2), mandates the use of trench boxes, shoring, or sloping when a trench's depth exceeds 1.2 metres and the ground is unst
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Question: When trenching in unstable soil conditions, what is the safest and most effective method to prevent cave-ins, according to Ontario Regulation 213/91?
Answer options: ✅ Use trench boxes or shoring systems.
- Slope the trench walls at a 1:1 ratio.
- Increase the trench width to improve stability.
- Excavate in 1.5-metre sections and backfill immediately.
Correct answer: Use trench boxes or shoring systems.
Explanation: Ontario Regulation 213/91, Section 234(2), mandates the use of trench boxes, shoring, or sloping when a trench's depth exceeds 1.2 metres and the ground is unstable, to prevent cave-ins. Trench boxes or shoring provide positive support against lateral earth pressure.
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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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