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Permit Required Confined Space Definition (OSHA -29 CFR 1910.146)

A Permit-Required Confined Space is a space that:

  1. is large enough and so configured that an employee can enter and performed assigned work; and
  2. has limited or restricted means for entry or exit; and
  3. is not designed for continuous employee occupancy; and
  4. has one or more of the following characteristics:
    1. Contains or has the potential to contain a hazardous atmosphere; or
    2. Contains a material that has the potential for entrapping, engulfing or suffocating an entrant; or
    3. Has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor which slopes downward and tapers to a smaller cross-section; or
    4. Contains any other recognized serious safety or health hazard.