Excavator Operator Certification Exam Prep · Question
In stable, self-supporting ground (e.g., Type A soil), what is the maximum vertical side wall allowed for a trench before shoring or sloping is required, according to typical Canadian regulations?
Even in seemingly stable ground, provincial regulations like Ontario Reg 213/91 (s. 235) and WorkSafeBC G20.96 generally limit unsupported vertical trench walls
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Question: In stable, self-supporting ground (e.g., Type A soil), what is the maximum vertical side wall allowed for a trench before shoring or sloping is required, according to typical Canadian regulations?
Answer options: ✅ 1.2 metres (4 feet)
- 2.4 metres (8 feet)
- 0.6 metres (2 feet)
- No limit, as long as it's 'stable'
Correct answer: 1.2 metres (4 feet)
Explanation: Even in seemingly stable ground, provincial regulations like Ontario Reg 213/91 (s. 235) and WorkSafeBC G20.96 generally limit unsupported vertical trench walls to a maximum of 1.2 metres (4 feet) before protective systems become mandatory to prevent collapse.
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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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