CONFINED SPACE: Any space that has the following characteristics:
A. Large enough and so configured that an employee can bodily enter and perform assigned work.
B. Has limited or restricted means for entry or exit.
C. It is not designed for continuous human occupancy.
PERMIT-REQUIRED CONFINED SPACE:
A. Any confined space that has one or more of the following characteristics:
1. Contains or has known potential to contain a hazardous atmosphere.
2. Contains material with the potential for engulfment of an entrant.
3. Has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or a floor that slopes downward and tapers to a smaller cross section.
4. Contains any other recognized serious health hazard.
B. Examples of permit required-confined spaces include process vessels, crawl spaces, vats, boilers, storage tanks, pipelines, wells, manholes, sewers ventilation and exhaust ducts, pits or any underground areas.
A more complete list of definitions is found in section t, "Appendix A", of this chapter. (2019 Compilation)