A confined space has an oxygen level of 19.2%. What action is required before entry?
Correct Answer
C) Entry is prohibited - oxygen level is too low
OSHA requires oxygen levels between 19.5% and 23.5% for safe confined space entry. At 19.2%, the oxygen level is below the minimum safe threshold and entry is prohibited until the atmosphere is corrected.
Why This Is the Correct Answer
OSHA 29 CFR 1926.95 establishes strict atmospheric requirements for confined space entry, mandating oxygen levels between 19.5% and 23.5%. At 19.2%, the oxygen concentration falls below the minimum safe threshold of 19.5%, creating an oxygen-deficient atmosphere. Entry is absolutely prohibited until the atmospheric conditions are corrected through ventilation or other means. No amount of PPE or monitoring can override this fundamental safety requirement when oxygen levels are deficient.
Why the Other Options Are Wrong
Option B: Entry is permitted with standard PPE
Standard PPE cannot protect against oxygen deficiency - workers would still be breathing oxygen-deficient air which can cause unconsciousness or death
Option D: Entry is permitted with supplied air respirators only
Continuous air monitoring alone does not solve the problem of insufficient oxygen - it only tracks the dangerous condition
Memory Technique
Remember '19.5 to SURVIVE' - oxygen must be at least 19.5% or entry is prohibited
Reference Hint
OSHA 29 CFR 1926.95 - Safety and Health Regulations for Construction, Confined Spaces section
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