Which procedure is essential before workers enter a permit-required confined space?

Performing atmospheric testing is essential before workers enter a permit-required confined space because it helps to identify any hazardous conditions that may pose a risk to their safety. Confined spaces can have dangerous atmospheres due to the potential presence of toxic gases, lack of oxygen, or explosive conditions. Conducting atmospheric testing ensures that the environment is safe for entry by measuring levels of oxygen, flammable gases, and toxic substances. This step is crucial for preventing accidents and ensuring the health and safety of workers as it provides critical information that can affect the planning and execution of any work to be done in the confined space.

While establishing a communication protocol, reviewing safety regulations, and obtaining medical clearance are important safety management procedures, they do not address the immediate dangers present in the atmosphere of confined spaces. Proper atmospheric testing is foundational because it directly relates to the immediate environment in which workers will be operating and is often a prerequisite for any further safety measures to be effective.