Plumber Red Seal · Question
Before entering a deep sewer manhole that has been closed, which safety procedure is most critical?
Sewer manholes are confined spaces where dangerous gases can accumulate and oxygen can be displaced. Atmospheric testing is essential to ensure the space is saf
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Question: Before entering a deep sewer manhole that has been closed, which safety procedure is most critical?
Answer options:
- Wearing high-visibility clothing and a hard hat. ✅ Testing the atmosphere for oxygen deficiency, flammability, and toxic gases.
- Setting up a barricade and traffic cones around the work area.
- Ensuring a ladder is securely placed for entry and egress.
Correct answer: Testing the atmosphere for oxygen deficiency, flammability, and toxic gases.
Explanation: Sewer manholes are confined spaces where dangerous gases can accumulate and oxygen can be displaced. Atmospheric testing is essential to ensure the space is safe to enter, even for a short duration.
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