Working in Confined Spaces Working in a confined space is a unique and serious hazard. There is no halfway problem:  Either there is or isn’t a problem. By one definition, a confined space is one that is large enough and arranged so that an employee can fully enter and work, has limited or restricted entry or exit and which is not primarily designed for human occupancy. Insert company policy. See WAC 296- 809 for Confined Space rules. Guide for Discussion Primary Hazards: Oxygen deficiency.   Exposure to toxic substances. Combustible or Explosive. Safety Procedures: Test for oxygen deficiency. Sample for combustible gases. (Most combustible gas meters will not...