According to Federal Regulations, a confined or enclosed space that is being prepared for crew members to enter, should be tested and designated "NOT SAFE FOR WORKERS" if the oxygen content of the atmosphere in the compartment is LESS than ____.
• Oxygen percentage limits for safe entry into confined or enclosed spaces under U.S. regulations • Difference between normal atmospheric oxygen and the minimum acceptable level for workers to enter • How regulations distinguish between safe for entry and NOT SAFE FOR WORKERS designations
• First, recall the approximate percentage of oxygen in normal fresh air, then think about how far below that regulators set the danger threshold • Consider which of the answer choices is most realistic as a percentage of volume (e.g., 13.5%, 15.5%, etc.) for labeling an area unsafe to enter • Think about which oxygen level would still be close enough to normal to be acceptable, versus clearly unsafe for human occupancy
• Confirm that these numbers represent fractions of 1.0 (e.g., 0.195 = 19.5%) and not percent directly • Compare each option to normal atmospheric oxygen (~21%) and ask which level regulations would treat as clearly hazardous • Verify in current 46 CFR and related confined space guidance what the minimum safe oxygen content is for worker entry, then match it to one of the decimal values
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