Confined Spaces:

A Permit-Required Confined Space is a confined space that has one or more of the following characteristics:
Contains or has the potential to contain a hazardous atmosphere
Contains a material that has the potential for engulfing an entrant
Has an internal configuration such that an entrant could become trapped or asphyxiated
Contains any other serious safety or health hazard.


A Non-Permit Confined Space is a confined space that:
A confined space that does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death of serious physical harm.