What must be first tested before an employee enters a Permit Confined Space?

Before an employee enters a Permit Confined Space, the atmosphere must be tested for hazardous conditions, including oxygen levels, flammable gases, and toxic substances. This testing typically involves using calibrated equipment to ensure that the environment is safe for entry. Additionally, factors such as temperature and potential physical hazards should also be assessed. Only after confirming a safe atmosphere and addressing any identified risks can entry be permitted.