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CSA E60335-2-11-13 (2019): Technical Requirements for Tumble Dryers – A Comprehensive Guide
Understanding the Safety and Performance Standards for Household Tumble Dryers in Canada
The standard CSA E60335-2-11-13:2019 (reaffirmed 2019) is the Canadian adoption of IEC 60335-2-11, specifically addressing the safety and performance of household electric tumble dryers. Published under the CSA C22.2 series, this standard forms a critical part of Canada’s electrical safety framework for appliances. It applies to tumble dryers intended for household and similar purposes, with a rated voltage not exceeding 250 V for single-phase appliances and 480 V for other appliances. The 2019 edition incorporates updates related to moisture sensing controls, door interlock testing, and clearer requirements for heat pump dryers.
This article provides a technical overview of the standard’s scope, key technical requirements, implementation considerations, and compliance notes for manufacturers, test engineers, and regulatory professionals.
Scope and Applicability
CSA E60335-2-11-13 (2019) covers the safety of electric tumble dryers for household use, including appliances that incorporate a refrigerating system (heat pump dryers). It also applies to dryers that use hot air from an external source, provided they are under the scope of the standard. The document does not cover:
- Commercial or industrial laundry equipment (covered by separate standards)
- Appliances intended exclusively for professional use
- Dryers designed for hazardous locations
- Electrically operated drying cabinets without tumbling action
The standard applies both to vented (air exhausted to the room or outdoors) and condenser (including heat pump) type dryers. It also addresses dryers that include a washing function (washer-dryer combinations) in their tumble drying cycle.
Note on Harmonization: CSA E60335-2-11-13 is technically equivalent to IEC 60335-2-11:2012+AMD1:2014+AMD2:2018, with national deviations for Canadian electrical supply and installation practices. Where differences exist, the Canadian requirements take precedence for products sold in Canada.
Technical Requirements
The technical requirements of CSA E60335-2-11-13 cover construction, electrical safety, thermal protection, mechanical hazards, and operational reliability. Key areas are summarised below.
Heating and Temperature Control
Heating elements and temperature control systems must prevent excessive surface temperatures that could cause fire, burns, or damage to fabrics. The standard specifies:
- Maximum temperature rise limits for accessible surfaces (e.g., drum outlet air temperature, door glass).
- Performance of thermal cut-outs (non‑self‑resetting) under fault conditions.
- Requirements for moisture sensing controls: If a dryer relies on moisture sensors to terminate the cycle, the sensor must function reliably over the full range of fabric loads and moisture levels.
| Parameter | Requirement | Test Condition |
|---|---|---|
| Maximum outlet air temperature (vented) | ≤ 135 °C | Maximum load, maximum heat setting |
| Maximum drum door surface temperature | ≤ 65 °C (metal) ≤ 75 °C (glass/plastic) | Measured after 30 minutes of steady‑state operation |
| Thermal cut‑out operating temperature | Between 120 °C and 150 °C (typ.) | Under simulated heater failure (sensing element disabled) |
| Moisture sensor resistance range (dry) | > 500 kΩ | Room temperature, sensor clean |
| Moisture sensor resistance range (wet) | < 50 kΩ | Sensor immersed in deionised water |
Design Caution: Moisture sensor circuits are considered safety‑critical for automatic termination. The standard requires that a failure of the sensor (short or open circuit) must not lead to unsafe heating. Designers should implement redundant sensing or a fail‑safe timer that overrides a faulty sensor within a defined time limit.
Mechanical Safety and Interlocks
Tumble dryers with a rotating drum must incorporate a door interlock that prevents the drum from moving when the door is open. The interlock must also stop heating when the door is opened, even if the motor continues to run (e.g., during a cool‑down cycle). Key requirements include:
- Interlock activation within 0.5 seconds of door opening.
- The interlock must not be defeasible by a single fault (e.g., a broken spring or simply pushing the latch).
- A manual “emergency stop” is not required but if provided must be clearly marked and non‑latching.
Best Practice: Use a positive‑break microswitch in series with the motor and heater contactors. This ensures a fail‑safe state even if the control logic fails. Many leading manufacturers also employ a secondary temperature limiter independent of the electronic control board.
Electrical and Electronic Controls
Electronic controls, including touch panels and Wi‑Fi modules, must comply with the requirements of Annex R (IEC 60335‑1) for programmable electronic circuits. For tumble dryers, the following are specifically assessed:
- Software safety functions (e.g., heater cutoff, door lock states) must be validated according to a defined safety integrity level – typically SIL 1 or equivalent.
- Power line disturbances (dips, interrupts, surges) must not cause unsafe operation.
- Cybersecurity for connected features is not yet explicitly required but is anticipated in future editions.
Implementation Highlights
When designing or certifying a tumble dryer to CSA E60335‑2‑11‑13, the following practical aspects should be prioritised:
- Thermal management: Use thermal fuses (non‑resetting) in addition to thermostats to comply with the single‑fault requirement. These should be located as close as possible to the heating element.
- Condenser/heat pump dryers: These must be tested with the condenser partially blocked to simulate lint accumulation. The dryer must still trip within safe temperature limits.
- Venting systems: Vented dryers require a clear specification for the maximum allowable back pressure (typically ≤ 40 Pa) and the installer must be provided with duct length equivalency tables.
- Documentation: Instruction manuals must include warnings about lint removal, proper venting, and the consequences of using a dryer without a filter – a common cause of non‑compliance in field inspections.
Critical Non-Compliance Risk: Products that fail to meet the door interlock requirements (Clause 20.101) or that allow heater operation with the door open are considered immediately hazardous. Such non‑compliance can lead to product recall and prohibition of sale under Canada’s Hazardous Products Act.
Compliance Notes and Testing
Certification to CSA E60335‑2‑11‑13 is typically performed by accredited testing laboratories (e.g., CSA Group, Intertek, UL). The following notes are essential for the compliance process:
- Tests are conducted at rated voltage ±6 %, and at the extremes of the specified temperature range for the appliance class (e.g., 10 °C to 40 °C ambient).
- Clause 11 (Heating) requires that all temperature sensors that affect control are either placed in their intended positions or simulated accurately during tests.
- For heat pump dryers, the test must be carried out with the maximum charge of refrigerant and under the most onerous ambient conditions (typically 23 °C, 50 % RH).
- Production line tests as per Annex A (routine tests) must include a high‑voltage test (1.2 kV for basic insulation, 2.5 kV for reinforced) and a ground continuity check (< 0.1 Ω).
| Test | Reference Clause | Acceptance Criterion |
|---|---|---|
| High‑voltage (dielectric) test | 13.3 & A.2 | No breakdown or flashover during 60 s application |
| Leakage current (hot condition) | 13.2 | ≤ 3.5 mA for portable appliances; ≤ 5 mA for fixed |
| Thermal cutoff endurance | 19.13 | Must operate and remain open under fault; no re‑closure |
| Door interlock endurance | 22.106 | 50 000 cycles without failure |
| Lint filter obstruction (condenser only) | 11.102 | Thermal cutoff must trip within 30 minutes |
Tip for Manufacturers: Engage with a recognised certification body early in the design phase. Use a Preliminary Design Review (PDR) to verify that moisture sensing, thermal cutoff placement, and door interlock architecture meet both the letter and the spirit of CSA E60335‑2‑11‑13. This can reduce testing cycles by 20–30 %.
Conclusion
CSA E60335‑2‑11‑13 (2019) remains the authoritative standard for household tumble dryer safety in Canada. Its alignment with IEC 60335‑2‑11 allows manufacturers to leverage global designs while accommodating Canadian electrical and installation requirements. By focusing on robust thermal protection, reliable moisture sensing, and fail‑safe interlocks, manufacturers can achieve compliance and deliver safe, efficient appliances to the market. The standard is expected to be reaffirmed or updated by 2026, with possible enhancements in cybersecurity, energy efficiency, and connected appliance safety.
Frequently Asked Questions
Q: Does CSA E60335‑2‑11‑13 apply to dryers used in commercial settings, such as laundromats?
A: No. The standard explicitly covers household tumble dryers and similar purposes. Commercial laundry equipment falls under CSA C22.2 No. 60335‑2‑44 (for laundry machines) or specific industrial standards. However, a dryer rated for household use but installed in a light commercial setting (e.g., a small bed‑and‑breakfast) is still covered by this standard.
A: No. The standard explicitly covers household tumble dryers and similar purposes. Commercial laundry equipment falls under CSA C22.2 No. 60335‑2‑44 (for laundry machines) or specific industrial standards. However, a dryer rated for household use but installed in a light commercial setting (e.g., a small bed‑and‑breakfast) is still covered by this standard.
Q: Can I use an IEC 60335‑2‑11 certificate to show compliance with the Canadian standard?
A: Only if the product also meets the national deviations outlined in Annex ZZ of CSA E60335‑2‑11‑13. In practice, most certified bodies will require additional testing for differences such as Canadian supply voltage variations (120/240 V rather than 230 V), different ambient test conditions, and specific labeling requirements (bilingual English/French). A direct IEC certificate alone is not sufficient.
A: Only if the product also meets the national deviations outlined in Annex ZZ of CSA E60335‑2‑11‑13. In practice, most certified bodies will require additional testing for differences such as Canadian supply voltage variations (120/240 V rather than 230 V), different ambient test conditions, and specific labeling requirements (bilingual English/French). A direct IEC certificate alone is not sufficient.
Q: What is the most common cause of non‑compliance with this standard?
A: Based on certification lab reports, the leading issues are: (1) failure of the moisture sensor system to terminate heating under a simulated sensor fault, (2) inadequate door interlock durability (< 50 000 cycles), and (3) excessive lint accumulation in condenser ducts causing nuisance thermal cut‑out tripping. All three are design‑phase preventable.
A: Based on certification lab reports, the leading issues are: (1) failure of the moisture sensor system to terminate heating under a simulated sensor fault, (2) inadequate door interlock durability (< 50 000 cycles), and (3) excessive lint accumulation in condenser ducts causing nuisance thermal cut‑out tripping. All three are design‑phase preventable.
Q: Is there any difference between CSA E60335‑2‑11‑13 and UL 2158 ( Standard for Electric Clothes Dryers)?
A: Yes. While both standards address similar safety concerns, UL 2158 is more prescriptive in certain areas (e.g., drum volume ratios, exhaust duct temperature limits) and does not automatically harmonise with IEC. CSA E60335‑2‑11‑13 is the preferred standard for products exported to or sold in Canada, as it is referenced by the Canadian Electrical Code (CE Code, Part I). For products destined for both Canada and the USA, dual‑certification to both standards is common.
A: Yes. While both standards address similar safety concerns, UL 2158 is more prescriptive in certain areas (e.g., drum volume ratios, exhaust duct temperature limits) and does not automatically harmonise with IEC. CSA E60335‑2‑11‑13 is the preferred standard for products exported to or sold in Canada, as it is referenced by the Canadian Electrical Code (CE Code, Part I). For products destined for both Canada and the USA, dual‑certification to both standards is common.
Last updated: 2026