A permit-required confined space is a confined space that contains one or more health hazards. Steps must be taken to restrict access and to protect workers who may need to enter.
Confined space:
(1) large enough for a worker to enter completely
(2) not designed for continuous occupancy
(3) has a limited or restricted means of entry/exit
Permit-required confined space - one or more of the following:
(1) potential to contain a hazardous atmosphere
(2) contains material that has the potential to engulf someone entering the space
(3) has an internal configuration that may cause an entrant to be trapped or asphyxiated by inwardly converging walls or by a floor that slopes downward and tapers to a smaller cross-section
(4) contains any other recognized serious safety or health hazard
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