CSA C22.1:21 – Canadian Electrical Code, Part I (25th Edition), 2021

CSA C22.1:21 – Canadian Electrical Code, Part I (25th Edition), 2021 defines the national standard for the safe installation and maintenance of electrical equipment throughout Canada. This edition incorporates updated safety practices, supports emerging technologies, and aligns with evolving environmental and regulatory needs.

Highlights:

• Applies to all voltages and occupancies: residential, commercial, and industrial
• Expanded coverage of renewable energy, storage systems, EV charging, and hazardous locations
• Revised grounding, bonding, wiring methods, and overcurrent protection rules
• New climate resilience rules and guidance for livestock/agricultural buildings
• Refined equipment classifications, voltage references, and conductor ampacity updates
• Enhanced provisions for raceways, environmental protection, and installation practices
• Includes 80+ specialized sections (hospitals, cranes, marinas, airports, amusement parks)
• Appendices cover engineering interpretations, intrinsically safe circuits, and fire protection

Who It’s For:
Electricians, engineers, code officials, and contractors operating under Canadian electrical safety regulations. Supersedes CSA C22.1-18.

CSA C22.1:21