Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
CSA C22.2 No. 2459-08 (2018): Electromagnetic Field Immunity Requirements for Electrical Equipment – An In-Depth Guide
Understanding the Scope, Technical Specifications, and Compliance Pathways for Radiated RF Immunity Testing Under the Canadian Electrical Code
Scope and Application
CSA C22.2 No. 2459-08 (2018) specifies immunity requirements for electrical and electronic equipment intended for use in residential, commercial, and light-industrial locations. It forms part of the Canadian Electrical Code, Part II (CSA C22.2 series) and establishes standardized test methods for radiated, radio-frequency electromagnetic fields. The standard applies to equipment with a rated supply voltage not exceeding 600 V and covers the frequency range from 80 MHz to 6 GHz. It is harmonized with IEC 61000-4-3 but includes Canadian modifications to reflect local power grid characteristics and installation practices.
Equipment covered includes household appliances, office machines, lighting equipment, information technology equipment, industrial process control devices, and similar products that are subject to electromagnetic disturbances. The standard defines three categories of electromagnetic environments based on the intended location of use: residential (including residential commercial and light industrial), commercial, and light-industrial. Each category corresponds to specific immunity test levels.
Technical Requirements and Test Parameters
Test Levels and Frequency Bands
| Frequency Range | Environment Category | Field Strength (V/m) | Modulation |
|---|---|---|---|
| 80 MHz – 1 GHz | Residential / Commercial | 3 | 1 kHz AM 80% |
| 80 MHz – 1 GHz | Light-Industrial | 10 | 1 kHz AM 80% |
| 1 GHz – 6 GHz | Residential / Commercial | 3 | 1 kHz AM 80% |
| 1 GHz – 6 GHz | Light-Industrial | 10 | 1 kHz AM 80% |
The standard requires that the equipment under test (EUT) be exposed to the specified field strengths with a 1 kHz sinusoidal amplitude modulation at 80% depth. Frequency steps are set at 1% of the current frequency below 1 GHz and 0.5% above 1 GHz, with a dwell time sufficient for the EUT to respond (typically 1 to 3 seconds). Additional requirements apply when the EUT includes auxiliary ports or integral antennas.
Performance Criteria
CSA C22.2 No. 2459-08 (2018) defines three performance criteria for evaluating the EUT during and after exposure:
- Criterion A: The equipment continues to operate as intended without any degradation of performance or loss of function during the test.
- Criterion B: Temporary degradation of performance or loss of function is allowed, but the equipment must recover automatically after the disturbance ceases.
- Criterion C: Temporary degradation or loss of function is allowed, but the equipment must recover after manual intervention or a power reset.
Manufacturers must declare the applicable criterion for each function of the EUT. Typically, safety-critical functions require Criterion A, while non-safety functions may accept Criteria B or C.
Tip: When selecting the test level, always verify the intended installation environment. Residential and commercial locations generally require 3 V/m, but the presence of high-power radio transmitters or industrial machinery may necessitate the 10 V/m level to ensure realistic immunity margins.
Implementation and Testing Procedures
Test Facility Requirements
Testing must be conducted in a semi-anechoic chamber or an equivalent facility that provides a uniform field over the test area. The uniform field area (UFA) is defined as a hypothetical vertical plane of 1.5 m by 1.5 m, subdivided into a grid of 0.5 m by 0.5 m cells. At each cell center, the field strength must be within 0 dB to +6 dB of the nominal level when the chamber is calibrated using the substitution method. The standard requires that the field calibration be performed in the absence of the EUT and that the measurement antenna be positioned at the location of the EUT’s surface.
EUT Setup and Cabling
The EUT is placed on a non-conductive support inside the chamber. Cables are arranged to simulate typical installation practices, with length and routing documented. To prevent external interference, filters or ferrites are used on cables exiting the shielded room. The standard emphasizes that cable layout can significantly affect test reproducibility, so detailed photographs and descriptions are required in the test report.
Warning: Common mistakes include improper cable dressing that creates unexpected resonances, and insufficient dwell time at each frequency. Always follow the specific guidance in Section 7 of the standard regarding step size and dwell time to ensure all susceptible modes are excited.
Measurement Uncertainty
CSA C22.2 No. 2459-08 (2018) requires that laboratories evaluate and report the measurement uncertainty of the test setup. The overall expanded uncertainty (k=2) should not exceed 6 dB for frequencies up to 1 GHz and 7 dB for frequencies above 1 GHz. Labs must maintain documented procedures for uncertainty calculation as part of their ISO/IEC 17025 accreditation.
Compliance and Certification Notes
Conformity Assessment
Compliance with CSA C22.2 No. 2459-08 (2018) is typically demonstrated through testing by an accredited laboratory. For products seeking CSA certification (e.g., CSA Mark), the testing must be performed by a recognized certification body. The standard is generally applied as a mandatory safety requirement under the Canadian Electrical Code, meaning that equipment that does not meet the immunity criteria may be rejected for installation in Canada.
Success: Following CSA C22.2 No. 2459-08 (2018) ensures that your equipment is robust against common radio-frequency interference sources such as broadcast transmitters, mobile radios, and wireless devices. This reduces the risk of field failures and helps maintain brand reputation.
Documentation Requirements
A complete compliance dossier must include:
- Test report with detailed setup photos, EUT description, and test results for each frequency step.
- Statement of performance criteria and justification for each function.
- Calibration certificates for antennas, probes, and field generation equipment.
- Measurement uncertainty budgets.
- Declaration of the intended electromagnetic environment (residential, commercial, or light-industrial).
When the standard is cited in product-specific CSA C22.2 standards (e.g., for appliances or lighting), the manufacturer must ensure that the immunity test requirements are integrated into the overall type-test program.
Danger: Non-compliance with CSA C22.2 No. 2459-08 (2018) can lead to product recalls, rejection at border entry, and liability issues. It is critical to include immunity testing early in the product development cycle to avoid costly redesigns.
Reaffirmation and Updates
The 2018 reaffirmation confirms that the technical content of the 2008 edition remains valid and does not introduce new requirements. However, users should stay informed about subsequent amendments or adoption of newer IEC editions that may supersede this standard. As of 2026, this edition is still referenced by several CSA product standards and remains a key pillar of electromagnetic compatibility compliance in Canada.
Frequently Asked Questions
Q: What is the difference between CSA C22.2 No. 2459-08 (2018) and IEC 61000-4-3?
A: While technically harmonized, CSA C22.2 No. 2459-08 (2018) includes modifications for Canadian electrical conditions, such as specific line frequency harmonics considerations and references to Canadian installation codes. It also clarifies test level assignments for the residential/commercial and light-industrial categories found in CSA product standards. In practice, a test performed to IEC 61000-4-3 with equivalent levels will usually meet the Canadian requirement, but a formal assessment should verify the exact criteria applicable to the product category.
A: While technically harmonized, CSA C22.2 No. 2459-08 (2018) includes modifications for Canadian electrical conditions, such as specific line frequency harmonics considerations and references to Canadian installation codes. It also clarifies test level assignments for the residential/commercial and light-industrial categories found in CSA product standards. In practice, a test performed to IEC 61000-4-3 with equivalent levels will usually meet the Canadian requirement, but a formal assessment should verify the exact criteria applicable to the product category.
Q: Can I test equipment that operates above 600 V under this standard?
A: No. The scope of CSA C22.2 No. 2459-08 (2018) limits the supply voltage to 600 V. Equipment with higher voltages should refer to other CSA C22.2 standards that address immunity for heavy industrial or utility applications, or may need to be tested as per IEC 61000-4-3 with additional precautions for high-voltage safety.
A: No. The scope of CSA C22.2 No. 2459-08 (2018) limits the supply voltage to 600 V. Equipment with higher voltages should refer to other CSA C22.2 standards that address immunity for heavy industrial or utility applications, or may need to be tested as per IEC 61000-4-3 with additional precautions for high-voltage safety.
Q: What happens if my equipment fails the immunity test?
A: If the equipment does not meet the selected performance criterion, you must identify and mitigate the susceptibility. Common fixes include adding ferrite cores on cables, improving shielding of enclosures, redesigning PCB layouts, or implementing software filters. After modifications, re-testing is required at the affected frequencies. The standard does not prescribe specific remedies; any solution that achieves compliance is acceptable.
A: If the equipment does not meet the selected performance criterion, you must identify and mitigate the susceptibility. Common fixes include adding ferrite cores on cables, improving shielding of enclosures, redesigning PCB layouts, or implementing software filters. After modifications, re-testing is required at the affected frequencies. The standard does not prescribe specific remedies; any solution that achieves compliance is acceptable.
Q: Is it necessary to test every product variant separately?
A: Not necessarily. The standard allows for testing of a representative configuration (worst-case model) as long as any variations in design, enclosure, or cable connections do not significantly affect immunity. However, all variants must be covered by a rationale based on engineering analysis. Certification bodies often require a series of verification tests on different models before a family certification is granted.
A: Not necessarily. The standard allows for testing of a representative configuration (worst-case model) as long as any variations in design, enclosure, or cable connections do not significantly affect immunity. However, all variants must be covered by a rationale based on engineering analysis. Certification bodies often require a series of verification tests on different models before a family certification is granted.
Published: 2026