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Technical Analysis of CSA C22.2 No. 1335.1-93 (2018): General Safety Requirements for Household Electrical Appliances
Navigating the Canadian National Standard for Appliance Safety and Certification
Introduction and Scope
CSA C22.2 No. 1335.1-93 (R2018) is the official Canadian national standard adopting the international IEC 60335-1, titled “Safety of Household and Similar Electrical Appliances — Part 1: General Requirements.” As a foundational element of the Canadian Electrical Code (Part II), this standard establishes the minimum safety requirements for the design, construction, and testing of electrical appliances destined for residential and light commercial use.
The standard applies to appliances with a rated voltage not exceeding 250 V for single-phase and 480 V for other appliances. It covers reasonably foreseeable hazards including electric shock, fire, excessive temperature, mechanical instability, moving parts, and radiation. The general requirements of this Part 1 must be used in conjunction with the specific Part 2 standards, which address the particular requirements of individual appliance types. The standard excludes equipment intended exclusively for industrial purposes, appliances for explosive atmospheres, and medical electrical equipment.
Core Technical Requirements
Classification and Protection Against Electric Shock
Appliances are classified according to their method of protection against electric shock: Class I (relies on basic insulation and a protective earth conductor), Class II (double or reinforced insulation without protective earth), and Class III (powered by Safety Extra-Low Voltage, SELV). The standard mandates rigorous verification that accessible conductive parts are not electrified under normal or single-fault conditions. Leakage current measurements are conducted at operating temperature and after humidity exposure, with limits typically set at 0.75 mA for portable Class I appliances and 0.25 mA for Class II appliances.
Temperature Rise and Insulation Coordination
Temperature rise testing under normal operating conditions is a critical component of the standard. Limits are strictly prescribed for windings, external surfaces, and internal components to ensure a safe lifespan of the appliance. Table 1 outlines the maximum allowable temperature rises for key insulating materials.
| Component / Material Class | Maximum Temperature Rise (K) |
|---|---|
| Class A insulation (cotton, silk, paper) | 75 |
| Class E insulation (resin, wire enamels) | 90 |
| Class B insulation (mica, glass fiber) | 95 |
| Class F insulation | 115 |
| External accessible surfaces (knobs, handles) | 15–35 (depending on material) |
| Supply cord (ordinary PVC) | 45 |
Clearances and Creepage Distances
The standard specifies minimum air clearances and creepage distances based on working voltage, pollution degree (typically PD2 for household appliances), and material group. These distances ensure that insulation withstands transient overvoltages and sustained stresses. Table 2 provides the required creepage distances for basic insulation under Pollution Degree 2 conditions.
| Working Voltage (V) | Material Group I (mm) | Material Group II (mm) | Material Group IIIa/b (mm) |
|---|---|---|---|
| Up to 50 | 0.6 | 0.9 | 1.2 |
| 50 to 150 | 1.5 | 1.9 | 2.4 |
| 150 to 250 | 2.5 | 3.2 | 4.0 |
Mechanical Strength and Construction
The enclosure must withstand a spring-operated impact hammer test (0.5 J for common areas, 1.0 J for weaker zones). Components such as switches, motors, and thermostats must be appropriately rated for the load. The supply cord anchorage and strain relief are subject to a 100 N / 25-cycle pull test to prevent conductor pull-out during normal use.
Implementation Highlights for Manufacturers
Adopting CSA C22.2 No. 1335.1-93 (R2018) requires careful consideration of the Canadian national deviations from the base IEC 60335-1 text. Manufacturers must pay particular attention to the following:
Warning: A frequent cause of non-compliance is the calculation of creepage distances for functional insulation. Designers often mistakenly apply values for basic insulation, which can lead to spacing discrepancies during the high-voltage dielectric test. Always verify the specific insulation class and pollution degree at the design stage.
Technical Tip: The CSA standard mandates that supply cords be suitable for Canadian environmental conditions. This typically requires SJT, SJTW, or SPT-2 jacketing for portable appliances. Additionally, the standard expects that all markings and safety instructions are presented in both English and French to satisfy Canadian trade regulations.
It is strongly recommended to establish a generic test matrix based on the Part 1 general requirements before moving to Part 2 specific testing. This modular approach reduces redundant testing when certifying multiple appliance families under the same Part 1 edition.
Compliance and Certification Notes
Compliance with CSA C22.2 No. 1335.1-93 (R2018) is mandatory for appliances sold in Canada. Certification must be obtained from an accredited body such as CSA Group, UL (cUL mark), or Intertek (cETL mark). The certification process typically involves the following stages:
- Review of Bill of Materials and critical component recognition
- Construction assessment and dimensional verification (creepage/clearance)
- Risk of electric shock, fire, and mechanical hazard testing
- Abnormal operation testing (locked rotor, blocked vents, component failure)
- Factory inspection and follow-up surveillance
Critical: A leading cause of certification delays is the submission of components not certified to recognized national standards. All safety-critical components (switches, thermostats, capacitors, power cords) must be CSA-recognized or certified by a SCC-accredited body.
Best Practice: Engage an accredited testing laboratory early in the product development cycle. A pre-compliance evaluation can identify critical design gaps—particularly in insulation coordination and thermal protection—long before formal submittal, significantly reducing time-to-market and development costs.
It is important to note that while the 1993 edition was reaffirmed in 2018, more recent editions of the standard (such as CSA C22.2 No. 60335-1:23) are available. Always confirm with your certification body and local jurisdictional authority which specific edition is required for your product category. This analysis reflects the compliance landscape as of the 2026 technical writing cycle.
Frequently Asked Questions (FAQs)
Q1: What is the relationship between CSA C22.2 No. 1335.1 and the Canadian Electrical Code (CSA C22.1)?
A: CSA C22.1 (Part I) is the installation code governing how appliances are connected in the field. CSA C22.2 No. 1335.1 (Part II) is a product safety standard dictating the design, construction, and testing of the appliance itself to ensure it can be safely installed according to Part I.
A: CSA C22.1 (Part I) is the installation code governing how appliances are connected in the field. CSA C22.2 No. 1335.1 (Part II) is a product safety standard dictating the design, construction, and testing of the appliance itself to ensure it can be safely installed according to Part I.
Q2: How does the 2018 reaffirmation affect compliance with newer IEC 60335-1 editions?
A: The R2018 reaffirmation validates the 1993 text with its specific Canadian amendments. However, the industry generally migrates toward the latest adopted edition. Manufacturers must confirm the exact acceptable edition (e.g., 1993 edition vs. 5.2 edition) with the certification body handling their project, as provincial regulations may vary.
A: The R2018 reaffirmation validates the 1993 text with its specific Canadian amendments. However, the industry generally migrates toward the latest adopted edition. Manufacturers must confirm the exact acceptable edition (e.g., 1993 edition vs. 5.2 edition) with the certification body handling their project, as provincial regulations may vary.
Q3: What are the key differences between testing for the Canadian market versus the European market under IEC 60335-1?
A: While the technical core is harmonized, the Canadian standard includes specific national deviations: mandated bilingual marking (English/French), different ambient temperature assumptions for temperature rise testing (30°C vs 25°C), specific NEMA plug configurations, and distinct supply cord types (e.g., SJT/SJTW instead of H05VV-F).
A: While the technical core is harmonized, the Canadian standard includes specific national deviations: mandated bilingual marking (English/French), different ambient temperature assumptions for temperature rise testing (30°C vs 25°C), specific NEMA plug configurations, and distinct supply cord types (e.g., SJT/SJTW instead of H05VV-F).