Plumber Red Seal · Question
Before entering a manhole to work on a sewer line, what is the first critical safety action?
Manholes are confined spaces with a high potential for hazardous atmospheres. Before any entry, the atmosphere must be tested from the outside to ensure it is s
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Question: Before entering a manhole to work on a sewer line, what is the first critical safety action?
Answer options:
- Don a full-face respirator. ✅ Test the atmosphere inside for oxygen deficiency, flammability, and toxic gases.
- Set up a powerful ventilation fan.
- Lower a ladder into the space.
Correct answer: Test the atmosphere inside for oxygen deficiency, flammability, and toxic gases.
Explanation: Manholes are confined spaces with a high potential for hazardous atmospheres. Before any entry, the atmosphere must be tested from the outside to ensure it is safe to enter, even for a moment.
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