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CSA C22.2 No. 139-13 (2018): Safety Compliance for Electrically Operated Valve Actuators
Technical deep-dive into the scope, performance requirements, and certification process for electric valve actuators under the Canadian Electrical Code
CSA C22.2 No. 139-13 (2018), officially titled Electrically Operated Valve Actuators, is a cornerstone safety standard for the Canadian industrial market. Reaffirmed in 2018 to ensure continued relevance, this standard developed by the CSA Group defines the stringent construction, performance, and testing requirements for electrically powered devices used to operate industrial valves. Compliance with this standard is essential for manufacturers, system integrators, and end-users seeking to deploy safe, reliable, and code-compliant actuation solutions across process control, HVAC, and water treatment applications.
Scope and Application
The standard applies to industrial and commercial electrically operated valve actuators rated at 750 V or less. It covers a wide spectrum of configurations, including quarter-turn (rotary), multi-turn (gate/globe), and linear actuators intended for on-off, modulating, and emergency shutdown services. The standard explicitly addresses actuators used in ordinary locations but provides guidance applicable to actuators that may be installed in or adapted for hazardous locations through supplementary standards such as the CSA C22.2 No. 60079 series.
Actuators covered by this standard include integral controls, wiring compartments, and auxiliary components deemed necessary for the safe operation of the actuator and the controlled valve. It is critical to note that the valve itself is outside the scope of this standard. Similarly, manually operated actuators, hydraulic or pneumatic actuators, and actuators specifically designed for household appliances are not covered.
Tip: While CSA C22.2 No. 139-13 focuses strictly on the actuator assembly, system engineers must concurrently consult standards for the process valve (e.g., API 6D, MSS SP-72) and the mounting interface (ISO 5211) to ensure a fully compliant and safe valve assembly.
Core Technical Requirements
The standard establishes rigorous benchmarks across construction, electrical safety, and mechanical endurance. Adherence to these requirements ensures that actuators can withstand the demanding conditions of industrial environments without introducing electrical or mechanical hazards.
Construction and Enclosure Integrity
Actuator enclosures must comply with the appropriate CSA C22.2 No. 94 series (or equivalent) and must be rated for the intended environment (e.g., Type 3R, 4, 4X, 6). The standard mandates specific thicknesses for metallic enclosures as well as stringent corrosion resistance testing for ferrous and non-ferrous materials. Wiring compartments must provide adequate bending space and strain relief for field-installed conductors.
Performance and Endurance Testing
Endurance testing is a pivotal element of the standard. Actuators are classified and tested based on their intended duty cycle. The standard defines endurance classifications that directly correlate to the expected service life of the actuator under load.
| Test Parameter | Standard Requirements (CSA C22.2 No. 139-13) |
|---|---|
| Endurance Duty Classification | Standard Duty (10,000 cycles at rated load) Heavy Duty (100,000 cycles) Extra Heavy Duty (250,000 cycles) |
| Temperature Rise | Winding temp rise limits per insulation class: Class A 65°C, Class B 85°C, Class F 105°C |
| Dielectric Withstand (Hi-Pot) | 1000 V plus 2x rated voltage for 1 minute across live parts and enclosure |
| Torque / Thrust Rating | Must sustain rated output without exceeding 110% of full-load current for 15 seconds |
| Overload Protection | Mandatory — thermal protector or current-sensing device coordinated with motor thermal limits |
| Environmental Enclosure | Rain, spray, dust, and external icing tests per NEMA/CSA Type 3R, 4, 4X specifications |
Warning: The standard mandates that overload protection must be provided within the actuator. Designers must ensure that the overload withstand capability of the actuator’s motor matches or exceeds the rating of the protective device, preventing nuisance tripping or catastrophic burnout during stalled rotor conditions.
Marking and Documentation
Clear and durable marking is required. Actuators must be marked with the manufacturer’s name, model number, electrical ratings (volts, amps, phase, frequency), rated torque/thrust, duty rating, ambient temperature range, and enclosure type nameplate. Additionally, wiring diagrams must be provided inside the wiring compartment cover.
Success: Achieving certification to CSA C22.2 No. 139-13 streamlines acceptance by provincial Electrical Safety Authorities such as ESA (Ontario), BC Safety Authority, and CNESST (Québec), and is widely recognized by major engineering procurement contractors (EPCs) and industrial end-users.
Implementation and Compliance
In Canada, provincial and territorial electrical codes mandate that products installed in electrical installations be certified to a recognized standard. Certification to CSA C22.2 No. 139-13 provides the foundation for that acceptance. The certification process typically involves factory inspection, design review, and witnessed testing at an accredited laboratory.
When specifying actuators for critical applications, the following compliance notes are critical:
- Fail-Safe Configurations: The standard covers normal electrical operation. For spring-return (fail-safe) or battery backup systems, supplementary testing per the manufacturer’s specifications and relevant performance standards must be evaluated alongside the base standard.
- Hazardous Locations: For installations in Class I, II, or III environments, the actuator must also comply with the CSA C22.2 No. 60079 series marking and construction requirements in addition to No. 139.
- System Integration: The actuator’s mounting interface should conform to ISO 5211. Verification of torque and thrust compatibility between the actuator and the valve is the responsibility of the system designer and is outside the direct scope of this standard.
Danger: Beware of counterfeit or improperly certified actuators. Non-compliant units can lead to catastrophic valve failures, uncontrolled process release, serious personnel injury, and violation of workplace safety regulations. Always verify that the certification mark is genuine and matches the scope of the installation.
Frequently Asked Questions
Q: How does CSA C22.2 No. 139-13 relate to UL 429 and NEMA ICS 4?
A: These standards are harmonized and substantially equivalent in their safety requirements. CSA C22.2 No. 139-13 is the Canadian national adoption covering construction and testing. UL 429 covers the same ground for the US market. NEMA ICS 4 provides additional application guidance, particularly for duty cycles and service factors. In most cases, compliance with CSA No. 139 is recognized as satisfying UL 429 requirements under the Canada-US Mutual Recognition Agreement (MRA).
A: These standards are harmonized and substantially equivalent in their safety requirements. CSA C22.2 No. 139-13 is the Canadian national adoption covering construction and testing. UL 429 covers the same ground for the US market. NEMA ICS 4 provides additional application guidance, particularly for duty cycles and service factors. In most cases, compliance with CSA No. 139 is recognized as satisfying UL 429 requirements under the Canada-US Mutual Recognition Agreement (MRA).
Q: Does the standard differentiate between on-off and modulating service actuators?
A: Yes. While the basic safety requirements (spacings, insulation, enclosure) apply universally, the endurance testing requirements vary. The end user must specify the intended service type. Actuators intended for frequent modulating or positioning service must be tested to a higher cycle count and may have stricter temperature rise limitations compared to infrequent open/close service.
A: Yes. While the basic safety requirements (spacings, insulation, enclosure) apply universally, the endurance testing requirements vary. The end user must specify the intended service type. Actuators intended for frequent modulating or positioning service must be tested to a higher cycle count and may have stricter temperature rise limitations compared to infrequent open/close service.
Q: What are the requirements for torque and limit switches under CSA C22.2 No. 139-13?
A: The standard requires that all actuators be provided with means to limit the travel and torque of the output drive. This is typically achieved via position limit switches and torque switches. These devices must be positively driven and rated for the electrical load they control. The actuation accuracy and repeatability must be verified during the type test.
A: The standard requires that all actuators be provided with means to limit the travel and torque of the output drive. This is typically achieved via position limit switches and torque switches. These devices must be positively driven and rated for the electrical load they control. The actuation accuracy and repeatability must be verified during the type test.
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© 2026 Technical Insights. All rights reserved. This article is for informational purposes only and does not replace the full text of the standard. Users should consult the official CSA C22.2 No. 139-13 publication for complete compliance requirements.