Question 1005 of 234 · California Wastewater Operator Exam
Which instrument reading means a confined space has a flammable atmosphere hazard?
Exactly one answer is correct.
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Correct answer to question 1005
- C: A combustible gas reading above 10 percent of the lower explosive limit
Explanation
Cal/OSHA treats a flammable gas, vapor or mist above 10 percent of its lower flammable limit as an atmospheric hazard that makes a space a permit-required confined space. A normal oxygen reading of 20.9 percent and 0 ppm H2S are normal results, not hazards.
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