Excavator Operator Certification Exam Prep · Question
A trench is being excavated in unstable soil to a depth of 2.1 metres. What is the minimum slope ratio permitted for the trench walls if no shoring or shielding is used, according to CSA Z275.3 Safety Code for Excavation?
For unstable or loose soil conditions, CSA Z275.3 often specifies a minimum slope ratio of 1.5:1 (horizontal to vertical) when no protective systems like shorin
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Question: A trench is being excavated in unstable soil to a depth of 2.1 metres. What is the minimum slope ratio permitted for the trench walls if no shoring or shielding is used, according to CSA Z275.3 Safety Code for Excavation?
Answer options:
- 1:1
- 0.75:1
- 1.25:1 ✅ 1.5:1
Correct answer: 1.5:1
Explanation: For unstable or loose soil conditions, CSA Z275.3 often specifies a minimum slope ratio of 1.5:1 (horizontal to vertical) when no protective systems like shoring or shielding are employed. This increased slope helps to enhance stability and prevent collapse, which is a significant hazard in deep trenches.
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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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