Confined Space

Confined spaces are among the most dangerous of all workplaces. However, if all hazards are identified, and if measures are taken to control the identified hazards, the dangers of performing work in confined spaces can be controlled.

The University of Lethbridge Confined Space Entry - Code of Practice provides the procedures to be used by personnel entering and working in confined spaces.

Contact for further information on Confined Space Entry. Frequesntly asked questions are provided below:


What is a “Confined Space”?

Part 5 of the Alberta OHS Code outlines legislative requirements for Confined Space

Alberta’s OHS Code defines a confined space as:

“A confined space means a restricted space which may become hazardous to a worker entering it because of

(a) an atmosphere that is or may be injurious by reason of oxygen deficiency or enrichment, flammability, explosivity or toxicity,

(b) a condition or changing set of circumstances within the space that presents a potential for injury or illness, or

(c) the potential or inherent characteristics of an activity which can produce adverse or harmful consequences within the space.”


What is a “Restricted Space”?

Restricted Space means an enclosed or partially enclosed space, not designed or intended for continuous human occupancy that has a restricted, limited or impeded means of entry or exit because of its construction. A restricted space can be thought of as a work area in which the only hazard is getting into or out of the space. All other hazards are either non-existent or have been eliminated or controlled as required by Part 2 of the Code.



Alberta Workplace Health and Safety, Guideline for Developing a Code of Practice for Confined Space Entry:

Alberta Workplace Health and Safety, Sewer Entry Guidelines:

Alberta Workplace Health and Safety, Workers Exposure to Sewage: