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CSA C22.2 No. 269.1-17: Technical Requirements for Surge Protective Devices in Canada
Understanding the Canadian Standard for Type 1 and Type 2 Surge Protective Devices
Scope of CSA C22.2 No. 269.1-17
CSA C22.2 No. 269.1-17, titled Surge protective devices – Type 1 and Type 2, is a part of the Canadian Electrical Code, Part II (C22.2 series). This standard specifies safety and performance requirements for surge protective devices (SPDs) intended for use in alternating current (AC) power circuits rated up to 1,000 V (rms). It covers two principal categories of SPDs: Type 1 (previously called Class I) and Type 2 (previously Class II). These devices are designed to limit transient overvoltages and divert surge currents to protect electrical and electronic equipment downstream.
The standard applies to SPDs permanently connected to the electrical distribution system, whether installed at the service entrance (Type 1) or at subdistribution panels and branch panels (Type 2). It excludes devices for low-voltage data, signal, or telecommunications circuits, which are covered by separate CSA standards in the 269 series.
By defining rigorous test criteria and performance metrics, CSA C22.2 No. 269.1-17 ensures that certified SPDs provide consistent surge protection while maintaining safe operation under normal and abnormal conditions.
Key Technical Requirements
CSA C22.2 No. 269.1-17 establishes a comprehensive set of requirements that SPDs must meet to be certified for use in Canada. The major technical parameters are outlined below.
Surge Current Ratings
Type 1 SPDs are characterized by their impulse discharge current rating (Iimp), representing the peak current they can withstand from a 10/350 µs waveform. Type 2 SPDs are rated by their nominal discharge current (In) and tested with an 8/20 µs waveform. Additionally, each SPD must be marked with its maximum continuous operating voltage (MCOV), nominal voltage, and rated frequency.
Voltage Protection Rating (VPR)
The voltage protection rating (VPR) defines the maximum voltage that appears across the SPD terminals during a surge event. The standard mandates that VPR be measured under specific test currents (e.g., 3 kA, 5 kA, or 10 kA) and must not exceed the values declared by the manufacturer. This ensures that connected equipment is not subjected to damaging overvoltages.
Temporary Overvoltage (TOV) Withstand
SPDs must demonstrate the ability to withstand temporary overvoltages caused by system faults or switching operations. The standard specifies TOV tests at defined magnitudes and durations, after which the SPD must remain safe (fail-safe) or continue to protect.
Additional Requirements
- Thermal Protection: An internal thermal disconnector is required to disconnect the SPD if it overheats due to repeated surges or end-of-life scenarios.
- End-of-Life Indication: A visual indicator (e.g., a window changing color) or remote signaling must inform the user when the SPD has reached its end of useful life.
- Housing and Environmental: Enclosures must meet corresponding CSA C22.2 enclosure requirements (e.g., CSA C22.2 No. 94.1 or No. 94.2) for indoor or outdoor use, including ingress protection and flame resistance.
- Marking: SPDs must be durably marked with the standard number, manufacturer name, ratings, wiring diagrams, and connection instructions.
| Parameter | Type 1 SPD | Type 2 SPD |
|---|---|---|
| Primary test waveform | 10/350 µs | 8/20 µs |
| Discharge current rating | Iimp (e.g., 12.5 kA, 25 kA per mode) | In (e.g., 10 kA, 20 kA per mode) |
| Typical installation location | Service entrance (load side of main overcurrent device) | Subpanel or branch panel |
| Maximum continuous operating voltage (MCOV) | May be higher (e.g., 150% of Un) | Related to system voltage |
| Overcurrent protection required (typical) | External fuse or breaker (per manufacturer) | Internal or external (per manufacturer) |
| TOV test requirement | Yes (higher magnitude) | Yes (lower magnitude) |
Implementation and Application Considerations
Proper application of CSA C22.2 No. 269.1-17–compliant SPDs requires attention to installation rules found in Part I of the Canadian Electrical Code (CSA C22.1). Key considerations include:
- Coordination: When both Type 1 and Type 2 SPDs are installed, the energy-handling capability (surge current rating) should decrease from the service entrance toward the load to ensure proper coordination. The standard does not mandate specific cascade designs, but the manufacturer’s instructions must be followed.
- Connection leads: Wire lengths between the SPD and the busbar or protected conductors should be minimized (typically less than 0.5 m) to avoid increased let-through voltage due to inductive voltage drop.
- Overcurrent protection: SPDs may require an external overcurrent protective device (fuse or circuit breaker). The rating and type must comply with the manufacturer’s marking and CSA C22.1 requirements.
- Environmental suitability: Outdoor SPDs must be listed for wet locations (appropriate NEMA/CSA enclosure type). Indoor SPDs should be protected from moisture and dust.
Tip: For optimal protection, install a Type 1 SPD at the main service panel to handle large external surges (e.g., lightning), and a Type 2 SPD at the subpanel where sensitive electronic loads are connected. Ensure the surge current rating of the downstream SPD does not exceed that of the upstream SPD to avoid impedance mismatches.
Warning: Temporary overvoltages (TOV) can be particularly damaging to SPDs. Verify the SPD’s TOV withstand capability against the local power system conditions. If the system experiences sustained high-voltage conditions (e.g., due to a neutral loss), the SPD must fail in a safe manner (e.g., open circuit) as required by the standard.
Compliance and Certification
CSA C22.2 No. 269.1-17 is recognized under the Canadian Electrical Code and is mandated by provincial and territorial authorities for SPDs sold and installed in Canada. Certification is typically performed by CSA Group or other accredited certification bodies (e.g., Intertek, UL). The certification process involves:
- Type testing: Complete verification of safety and performance requirements as defined in the standard.
- Factory inspections: Periodic audits of the manufacturer’s quality control program.
- Marking: The product must bear the certification mark (e.g., CSA Mark) adjacent to the standard reference “CSA C22.2 No. 269.1-17”.
Success: Using SPDs certified to CSA C22.2 No. 269.1-17 not only satisfies regulatory requirements but also provides a high level of assurance that the devices will perform safely under surge conditions. Many insurance programs offer premium reductions when such certified protection is installed.
The standard is harmonized in many aspects with UL 1449 (4th edition) but retains specific differences—such as optional tests for TOV withstand at low values and distinct marking requirements—making it essential for manufacturers to tailor their products and test programs for the Canadian market. Since the 2017 edition, amendments have been issued to align with evolving technology and international practices.
Compliance with CSA C22.2 No. 269.1-17 should be verified by reviewing the manufacturer’s certification documentation. The mark and the standard reference must appear on the product itself. For field-installed SPDs, the installer should also ensure that the device’s ratings (voltage, surge current, frequency) match the panel conditions and that all Canadian Electrical Code installation requirements are met.
Important: Non-certified SPDs or those marked as “UL Listed” only (without CSA or equivalent certification) may not be accepted by local inspection authorities in Canada. Always confirm that the SPD bears the appropriate certification mark referencing CSA C22.2 No. 269.1-17.
Frequently Asked Questions
Q: What is the difference between Type 1 and Type 2 SPDs according to CSA C22.2 No. 269.1-17?
A: Type 1 SPDs are intended for installation at the service entrance and are tested with a 10/350 µs waveform, representing the energy from direct lightning strikes. They have a high impulse discharge current rating (Iimp). Type 2 SPDs are installed at subpanels or branch panels, tested with an 8/20 µs waveform, and rated with a nominal discharge current (In). Type 2 devices handle induced surges rather than direct lightning currents.
A: Type 1 SPDs are intended for installation at the service entrance and are tested with a 10/350 µs waveform, representing the energy from direct lightning strikes. They have a high impulse discharge current rating (Iimp). Type 2 SPDs are installed at subpanels or branch panels, tested with an 8/20 µs waveform, and rated with a nominal discharge current (In). Type 2 devices handle induced surges rather than direct lightning currents.
Q: Does CSA C22.2 No. 269.1-17 apply to surge protective devices for DC circuits?
A: No. This standard specifically covers AC power circuits up to 1,000 V. For DC circuits or for low-voltage signal and data circuits, other CSA standards apply, such as CSA C22.2 No. 269.3 (SPDs for photovoltaic systems) or CSA C22.2 No. 269.4 (SPDs for data/telecom).
A: No. This standard specifically covers AC power circuits up to 1,000 V. For DC circuits or for low-voltage signal and data circuits, other CSA standards apply, such as CSA C22.2 No. 269.3 (SPDs for photovoltaic systems) or CSA C22.2 No. 269.4 (SPDs for data/telecom).
Q: How is CSA C22.2 No. 269.1-17 referenced in the Canadian Electrical Code, Part I?
A: The Canadian Electrical Code (CSA C22.1) includes requirements for surge protection in Sections 2, 24, and 26. It mandates that SPDs conform to CSA C22.2 No. 269.1 or other applicable SPD standards. Specifically, Section 2 Table 11 lists CSA C22.2 No. 269.1 as the standard for Type 1 and Type 2 SPDs.
A: The Canadian Electrical Code (CSA C22.1) includes requirements for surge protection in Sections 2, 24, and 26. It mandates that SPDs conform to CSA C22.2 No. 269.1 or other applicable SPD standards. Specifically, Section 2 Table 11 lists CSA C22.2 No. 269.1 as the standard for Type 1 and Type 2 SPDs.
Q: What are the main differences between CSA C22.2 No. 269.1-17 and UL 1449 4th Edition?
A: Although both standards are closely harmonized and share many test procedures, CSA C22.2 No. 269.1-17 includes additional requirements such as optional low-level TOV testing, distinct marking formats (mandatory reference to the Canadian standard), and specific enclosure ratings per CSA enclosure standards. Manufacturers targeting the Canadian market must test to the CSA version and obtain certification from a recognized Canadian accreditor.
A: Although both standards are closely harmonized and share many test procedures, CSA C22.2 No. 269.1-17 includes additional requirements such as optional low-level TOV testing, distinct marking formats (mandatory reference to the Canadian standard), and specific enclosure ratings per CSA enclosure standards. Manufacturers targeting the Canadian market must test to the CSA version and obtain certification from a recognized Canadian accreditor.
Article updated for reference year 2026 — always consult the latest edition of the standard for current requirements.