Canada Occupational Health and Safety Regulations

11.1 In this Part,

class of confined spaces

class of confined spaces means a group of at least two confined spaces that are likely, by reason of their similarity, to present the same hazards to persons entering, exiting or occupying them; (catégorie d’espaces clos)

confined space

confined space means an enclosed or partially enclosed space that

• (a) is not designed or intended for human occupancy except for the purpose of performing work,

• (b) has restricted means of access and egress, and

• (c) may become hazardous to any person entering it owing to

  • (i) its design, construction, location or atmosphere,

  • (ii) the materials or substances in it, or

  • (iii) any other conditions relating to it; (espace clos)

hot work

hot work means any work where flame is used or a source of ignition may be produced. (travail à chaud)