Confined Spaces has a set of national regulations. However, individual provinces and territories may have introduced minor changes while integrating Confined Spaces with their occupational health and safety regulatory regime. Here are provincial Regulations for any special Confined Spaces requirements:

British Columbia
British Columbia Occupational Health & Safety Regulation, 296/97, Part 9.8

Alberta
Alberta Occupational Health & Safety Code 2009, Part 5 46(1)

Saskatchewan
Saskatchewan Occupational Health and Safety Regulations, Part XVIII 272(3)

Manitoba
Manitoba Workplace Safety and Health Regulation 217/2006, Part 15

Ontario
Ontario Regulation 632/05 Section 8 & 9

Québec
Quebec OH&S Regulation, LRQ, c.S-2.1, Section XXI

New Brunswick
New Brunswick Regulation 91-191 Part 17 263(6)

Nova Scotia
Nova Scotia Regulation 4/2004 Part 12 130 3(b) & 5(a)

Newfoundland and Labrador
Newfoundland & Labrador Consolidated Regulation 70/09

Prince Edward Island
Prince Edward Island OH&S Act Regulations Part 13

Northwest Territories and Nunavut

Yukon Territories

Nation-wide (Canada)
Canada Occupational Health and Safety Regulations (SOR/86-304) Section 11.11