Practice Quiz

Red Seal Construction Electrician

Category - Construction Electrician

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A worker is tasked with climbing into a vessel with a single access hatch at the top. The atmosphere in the vessel was tested and found to be free of hazardous gasses and contained 20.9% oxygen, but has previously contained combustible gasses. Which of the following is correct?
  1. The worker may proceed with the task with no additional PPE.
  2. The vessel is considered a hazardous confined space, and additional measures will be required including continuous gas monitoring, a harness securely attached to a lifeline, and a safety watch person.
  3. The worker may proceed with the task if effective two-way communication with a safety watch person is maintained for the duration.
  4. The vessel may remain open once the worker has completed the task and be marked as having a safe atmosphere.
Explanation
Answer: B. Explanation: Even though the atmosphere was tested, the fact that it previously contained hazardous gasses means that additional safety steps are required.
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