Cal/OSHA General Industry 5157(b) Definitions and Cal/OSHA Construction 1951 Definitions: Confined space means a space that

  1. Is large enough and so configured that an employee can bodily enter and perform assigned work; and
  2. Has limited or restricted means for entry or exit (for example, tanks, vessels, silos, storage bins, hoppers, vaults, and pits are spaces that may have limited means of entry.); and
  3. Is not designed for continuous employee occupancy.