Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
CAN CSA E60730-2-7-18: Automatic Electrical Controls – Part 2-7: Particular Requirements for Timers and Time Switches
Scope, Technical Requirements, and Compliance Considerations for Canadian Adoption of IEC 60730-2-7
Scope and Purpose
CAN CSA E60730-2-7-18 is the Canadian adoption of IEC 60730-2-7, Part 2-7: Particular Requirements for Timers and Time Switches, under the umbrella of the IEC 60730 series for automatic electrical controls for household and similar use. This part 2-7 standard applies to the particular safety, operating values, and testing requirements for automatic timers and time switches used in or on appliances and equipment that fall under the general requirements of IEC 60730-1 (adopted as CAN CSA E60730-1).
The standard covers both electronic and electromechanical timers, including programmable timers, interval timers, and time switches with a rated voltage not exceeding 690 V a.c. or 600 V d.c. and a rated current up to 63 A. It addresses intended functions such as delay, cyclic timing, and time-based switching for applications like heating, ventilation, lighting, cooking, and industrial processes within residential, commercial, and light-industrial environments.
Key Benefit: Compliance with CAN CSA E60730-2-7-18 ensures timers and time switches meet rigorous safety and performance criteria, facilitating acceptance in the Canadian market and alignment with North American safety objectives.
Technical Requirements
CAN CSA E60730-2-7-18 defines specific technical requirements that supplement the general clauses of IEC 60730-1. The following are critical areas:
Timing Accuracy and Stability
The standard requires that the actual time delay, cycle time, or set-point deviation does not exceed the tolerances declared by the manufacturer under normal operating conditions. For programmable timers, drift and jitter must be measured over at least 24 hours of continuous operation. Tests are conducted at rated voltage and within the specified temperature range (typically 0 °C to 55 °C for indoor use).
Electrical and Environmental Endurance
Timers and time switches must withstand 100,000 operating cycles under resistive load (or as per manufacturer’s declaration). Contact ratings for switching inductive or capacitive loads are tested separately. Environmental tests include dry heat, cold, damp heat cyclic, and salt mist, depending on the intended protection class (IP rating).
Safety and Protection Against Faults
Controls must be designed to avoid unintended operation due to transient voltages, power interruptions, or component failure. Requirements include:
- Clearance and creepage distances for printed circuit boards (CTI ≥ 175 V).
- Protection against short circuits and overloads (fusing or PTC limiting).
- Software-based controls must comply with Class B or C software structure as per IEC 60730-1 Annex H.
| Timing Range | Accuracy (Class) | Ambient Temperature | Test Duration |
|---|---|---|---|
| 1 s – 60 s | ±2% or ±0.5 s | 23 °C ± 5 °C | 10 cycles |
| 1 min – 60 min | ±1% or ±3 s | 23 °C ± 5 °C | 5 cycles |
| 1 h – 24 h | ±0.5% or ±5 min | 23 °C ± 5 °C | 24 h continuous |
| Reset time after power fail | < 1 s (default to safe state) | – | 10 events |
Implementation Tip: When designing printed circuit assemblies for Class B software control, ensure that watchdog timers and redundant CPU monitoring circuits meet the minimum failure detection time of 8 seconds as specified in the standard.
Implementation Highlights
Integrating CAN CSA E60730-2-7-18 into product development requires attention to the following practical aspects:
- Component Derating: Relays, triacs, and electrolytic capacitors used in timing circuits must be derated by at least 20% for voltage and 15% for current under worst-case conditions.
- EMC Compliance: In addition to safety, timers must meet CISPR 14-1 (emission) and IEC 60730-1 immunity requirements (ESD, radiated RF, electrical fast transients).
- User Interface and Marking: Time scales and setting increments must be clearly indicated. The standard requires permanent marking of rated parameters, date code, and manufacturer identifier.
- Programmable Timers: If a timer includes a real-time clock with battery backup, the backup source must have a capacity sufficient to maintain timekeeping for at least 1000 hours of power loss.
Watch for Misinterpretation: The standard does not require absolute accuracy under all conditions; the declared accuracy applies at the rated voltage and temperature. Deviations due to voltage fluctuations (±10 % of rated) are allowed, but must be documented in the product specification.
Compliance Notes
To achieve certification to CAN CSA E60730-2-7-18, manufacturers typically engage a recognized certification body such as CSA Group, Intertek, or UL. The compliance pathway includes:
- Evaluation of construction and materials: PCB, enclosure, wire insulation, and spacing verification.
- Type tests: Full sequence of timing accuracy, endurance, environmental, and abnormal operation tests (locked rotor, stalled motor, or blocked operation).
- Factory inspection: Initial and periodic production line inspections to ensure consistency.
It is important to note that CAN CSA E60730-2-7-18 is intended to be used together with CAN CSA E60730-1 (the general part). Any deviation from the general clauses explicitly required by Part 2-7 takes precedence. The standard also references North American wiring practices (CSA C22.2 No. 0) and insulation coordination (IEC 60664-1).
Non-Compliance Risk: Timers not meeting the thermal endurance test (250 °C for 5 s on live parts) or failing the abnormal operation test can lead to mandatory recall and prohibition of sale under Canadian consumer product safety legislation.
Conclusion
CAN CSA E60730-2-7-18 provides a robust framework for ensuring the safety, reliability, and performance of automatic timers and time switches. Its adoption across Canada harmonizes with IEC global standards while accommodating local safety and electrical code requirements. Designers and compliance engineers must pay careful attention to the interplay of timing accuracy, electrical endurance, and environmental resilience to achieve a market-ready product.
— Published 2026
Frequently Asked Questions
Q: What is the difference between CAN CSA E60730-2-7-18 and the original IEC 60730-2-7?
A: The CSA version includes deviations for Canadian electrical codes (CEC) and climatic conditions. For example, temperature ranges are extended to cover Canadian winter conditions (–40 °C for outdoor-rated timers), and voltage ratings align with North American standards (120/240 V).
A: The CSA version includes deviations for Canadian electrical codes (CEC) and climatic conditions. For example, temperature ranges are extended to cover Canadian winter conditions (–40 °C for outdoor-rated timers), and voltage ratings align with North American standards (120/240 V).
Q: Does this standard apply to smart home timers with IoT connectivity?
A: Yes, as long as the device performs a time switching function. However, additional requirements from IEC 60730-1 Annex H (software Class B or C) and cybersecurity considerations (not covered by this standard) may also apply.
A: Yes, as long as the device performs a time switching function. However, additional requirements from IEC 60730-1 Annex H (software Class B or C) and cybersecurity considerations (not covered by this standard) may also apply.
Q: Can I use components certified to IEC 60730-2-7 directly in a Canadian-certified product?
A: Not automatically. The component must be re-evaluated for compliance with the CSA deviations unless a mutual recognition agreement exists. It is recommended to use components already marked with the CSA certification number.
A: Not automatically. The component must be re-evaluated for compliance with the CSA deviations unless a mutual recognition agreement exists. It is recommended to use components already marked with the CSA certification number.