SafetyQuestion 1306 of 1605
Before entering a permit-required confined space, the entry permit must document that the atmosphere has been tested. Which is typically tested FIRST?
a.Temperature
b.Humidity
c.Noise
d.Oxygen level, then flammables, then toxics
Explanation
Atmospheric testing order is oxygen first, then combustible/flammable gases, then toxic contaminants, because oxygen readings affect the accuracy of the other sensors and oxygen hazards are immediately dangerous.
Law Reference: 29 CFR 1926.1204Practice all 1605 questions free — no signup required.
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