During a confined space entry, what must the entry supervisor verify before permitting entry?

The requirement for the entry supervisor to verify that atmospheric conditions are safe is paramount before allowing entry into a confined space. This is due to the potential hazards presented by poor air quality, explosive atmospheres, or the presence of toxic gases, which can lead to severe health risks or fatalities.

Atmospheric testing is necessary to measure levels of oxygen, flammable gases, and toxic substances. Ensuring that the atmosphere is within acceptable limits is a critical step in hazard assessment and mitigation. Only once it is confirmed that these conditions are safe can other preparations for entry and work in the space be appropriately addressed.

While having personnel present, ensuring the space's size, and having tasks ready are important factors, they do not hold the same life-preserving significance as verifying atmospheric safety. If the air quality is not safe, then even a fully prepared team may face dire consequences upon entry.