Question 4023 of 229 · California Water Distribution Operator Exam
What oxygen concentration range is considered safe to enter a confined space?
Exactly one answer is correct.
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Correct answer to question 4023
- B: 19.5 to 23.5 percent
Explanation
Below 19.5 percent is oxygen deficient, and above 23.5 percent is oxygen enriched and a fire risk. Atmospheric testing is required before entry.
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