Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
CSA C108.1.2-M1981 (2013): Radio Interference Limits for Electrical Appliances and Equipment
A comprehensive guide to the scope, technical requirements, and compliance considerations for Canada’s long-standing EMC standard for household appliances, electric tools, and similar equipment.
First published in 1981 and reaffirmed in 2013, CSA C108.1.2-M1981 (2013) is a National Standard of Canada that establishes uniform limits for radio-frequency interference (RFI) generated by electrical motor-operated and thermal appliances used in household, commercial, and light industrial environments. Closely harmonized with CISPR 14‑1 (the international basic standard for such equipment), this standard serves as the cornerstone for demonstrating compliance with Industry Canada’s ICES‑001 (Interference-Causing Equipment Standard for Electrical Appliances).
This article examines the scope, technical emission limits, implementation requirements, and compliance pathways associated with CSA C108.1.2-M1981 (2013).
Scope and Purpose
Applicable Equipment
CSA C108.1.2-M1981 (2013) applies to:
- Motor-operated appliances (e.g., vacuum cleaners, washing machines, power tools);
- Thermal appliances (e.g., hair dryers, kettles, ovens);
- Electric tools and portable equipment;
- Similar apparatus that contains a source of radio-frequency disturbance.
The standard covers devices that use mains voltage (120 V – 240 V, 50 Hz/60 Hz).
Out‑of‑Scope Equipment
Not covered are heavy industrial equipment covered by C108.1.1, information technology equipment (C108.1.3), or equipment that already complies with dedicated emission standards (e.g., ISM‑RF generators).
Primary Objective
The purpose is to protect radio services operating in the frequency range 0.15 MHz to 300 MHz (with conducted limits up to 30 MHz) from intolerable interference, while enabling manufacturers to comply at reasonable cost.
Tip: Even though the standard was reaffirmed without technical changes in 2013, manufacturers should check whether updated editions (e.g., newer CISPR 14 versions) are referenced by current Canadian regulations, especially when marketing products internationally.
Technical Requirements and Emission Limits
Conducted Emissions
All equipment within the scope must be tested on a mains port using a quasi‑peak and average detector. The limits on both phase and neutral conductors are presented in the table below.
| Frequency Range (MHz) | Quasi‑peak Limit (dBµV) | Average Limit (dBµV) |
|---|---|---|
| 0.15 – 0.50 | 66 decreasing to 56 (linear) | 56 decreasing to 46 (linear) |
| 0.50 – 5.00 | 56 | 46 |
| 5.00 – 30.00 | 60 | 50 |
Measurements are performed with an artificial mains network (AMN) according to the test procedures defined in the standard. The use of the average detector is mandatory when the disturbance is caused by continuous switching or commutation.
Radiated Emissions
CSA C108.1.2-M1981 (2013) also specifies limits for radiated magnetic and electric fields in the frequency range 0.15 MHz to 300 MHz (the exact limits depend on the nature of the appliance). For most domestic equipment, the radiated limit at 30 m is 30 dBµV/m quasi‑peak, but the standard should be consulted for the complete set of limits and measurement distances.
Warning: Over‑voltage or non‑linear components may produce harmonics that cause emissions above the limit. Verify that your appliance’s electronic speed controls, triac dimmers, and universal motors are properly filtered.
Implementation and Application
Testing Setup
Tests are conducted in a screened room or open‑area test site (OATS) that meets the requirements of ANSI C63.4 or CISPR 16‑1. The equipment under test (EUT) is operated under normal load conditions or as defined in the product family test methods. Key parameters include:
- Power supply: nominal voltage ± 2 %;
- EUT placement: 0.8 m above ground plane;
- AMN impedance: 50 Ω / 50 µH.
Relationship with Other Standards
While C108.1.2 stands alone, it is part of a suite:
• CSA C108.1.1 – Limits for industrial, scientific, and medical equipment;
• CSA C108.1.3 – Limits for information technology equipment.
Together, these cover most consumer and commercial products sold in Canada.
Success: Products that fully comply with CSA C108.1.2-M1981 (2013) can be confidently marketed in Canada and are likely to fulfill the emission requirements of similar standards in the USA (FCC Part 15 Subpart B) and Europe (EN 55014‑1), provided the national deviations are considered.
Compliance and Certification
Regulatory Framework in Canada
Industry Canada (now Innovation, Science and Economic Development Canada – ISED) mandates compliance through ICES‑001. ICES‑001 explicitly cites CSA C108.1.2 as one means of demonstrating conformity. A Declaration of Conformity (DoC) must be issued by the manufacturer or importer, and technical documentation must be retained for at least five years.
Steps to Compliance
- Determine product category (Category C for household appliances).
- Pre‑scan the prototype at an accredited EMC laboratory.
- Perform formal tests against the conducted and radiated limits.
- Prepare a technical file including test reports, photographs, block diagrams, and a DoC.
- Apply the CSA mark if third‑party certification is desired, or affix the ICES‑001 compliance statement to the product.
Special Considerations
The 2013 reaffirmation did not introduce new requirements, but it confirmed that the 1981 limits are still considered adequate for the protection of licensed radio services. However, newer editions of CISPR 14‑1 contain more stringent limits for certain product categories (e.g., wireless charging). Manufacturers intending to export to the European Union or Asia should adopt the latest applicable version.
Danger: Marketing a non‑compliant product in Canada can lead to sales prohibition, recall orders, and penalties under the Radiocommunication Act. Always verify compliance with the latest version of the standard referenced by ISED.
Frequently Asked Questions
Q: Does CSA C108.1.2-M1981 (2013) apply to battery‑powered appliances?
A: No. The standard applies only to equipment that is powered from the mains supply and operates at rated voltages up to 250 V single‑phase. Battery‑operated cordless appliances that do not contain a switching power supply are generally excluded, unless they have a built‑in charger that connects to the mains during charging.
A: No. The standard applies only to equipment that is powered from the mains supply and operates at rated voltages up to 250 V single‑phase. Battery‑operated cordless appliances that do not contain a switching power supply are generally excluded, unless they have a built‑in charger that connects to the mains during charging.
Q: Can a product be certified by a test lab outside Canada?
A: Yes. ISED accepts test reports from ISO/IEC 17025 accredited laboratories anywhere in the world, provided the tests are performed according to the methods described in CSA C108.1.2. However, the manufacturer must still submit a valid Canadian DoC and may need to engage a local Canadian representative.
A: Yes. ISED accepts test reports from ISO/IEC 17025 accredited laboratories anywhere in the world, provided the tests are performed according to the methods described in CSA C108.1.2. However, the manufacturer must still submit a valid Canadian DoC and may need to engage a local Canadian representative.
Q: Renewing compliance in 2026 – is the 1981 edition still acceptable?
A: As of 2026, ISED generally accepts both the 1981 and the newer editions (if any) as long as the limits remain equivalent. Nevertheless, many testing houses recommend using CISPR 14‑1 to ensure international acceptance. It is always wise to check the latest List of Acceptable Standards published by ISED.
A: As of 2026, ISED generally accepts both the 1981 and the newer editions (if any) as long as the limits remain equivalent. Nevertheless, many testing houses recommend using CISPR 14‑1 to ensure international acceptance. It is always wise to check the latest List of Acceptable Standards published by ISED.
This article is provided for informational purposes and does not substitute for the full text of the standard. Always refer to the official CSA C108.1.2-M1981 (2013) document and consult with a qualified compliance engineer. — Published 2026