Which of the following is a required action before entry into a permit space?

Before entering a permit-required confined space, conducting atmospheric tests for flammable gases and vapors is a critical safety procedure. This action ensures that the environment within the space is safe for entry, as the presence of flammable gases can lead to explosive conditions, posing a severe risk to the health and safety of employees. Atmospheric testing identifies potential hazards, such as low oxygen levels or toxic substance concentrations, allowing for appropriate measures to be taken before any entry occurs.

Testing for atmospheric hazards is a prerequisite set by OSHA regulations to confirm that the atmosphere in the confined space is within acceptable limits. This step is part of the overall permit system designed to protect workers from potential dangers while they are performing their tasks.

In contrast, while bidirectional atmosphere testing may sound relevant, it is not a specific requirement for confined space entry. Regular employee rotations and daily safety drills, while important for overall workplace safety and preparedness, do not specifically address the unique atmospheric hazards present in confined spaces required by the permit system.