Plumber Red Seal · Question
What is the primary hazard associated with working in an unshored trench that is deeper than 1.2 meters (4 feet)?
In any trench deeper than 1.2 meters (4 feet), the weight of the soil creates a significant risk of the walls collapsing, which is the primary and most life-thr
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Question: What is the primary hazard associated with working in an unshored trench that is deeper than 1.2 meters (4 feet)?
Answer options:
- Exposure to hazardous gases
- Contact with underground electrical lines ✅ Cave-in or soil collapse
- Flooding from a high water table
Correct answer: Cave-in or soil collapse
Explanation: In any trench deeper than 1.2 meters (4 feet), the weight of the soil creates a significant risk of the walls collapsing, which is the primary and most life-threatening hazard.
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