RIIWHS202E Enter and Work in Confined Spaces Working in confined spaces has many risks: from airborne hazards being present and limited access to machines for entrapment, to challenges in making rescues, to points in between. Hence, the importance of the declared training unit, RIIWHS202E Enter and Work in Confined Spaces, is immense when considering how the risks are being managed and controlled on work sites. Â Appropriately applied, the principles and practices taught under