A confined space that has one or more of the following: contains or has the potential to contain a hazardous atmosphere; contains a material with the potential to engulf someone who enters the space; has an internal configuration that might 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; and/or contains any other recognized serious safety or health hazards.
restricted entry area, regulated enclosed space, controlled access zone, safety-monitored chamber, authorization-needed compartment