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Understanding CAN CSA E730-2-10-94: Motor-Starting Relays for Household and Similar Use
A Comprehensive Guide to the Canadian Standard for Automatic Electrical Controls – Motor-Starting Relays
Scope and Application
CAN CSA E730-2-10-94 is the Canadian adoption of IEC 60730-2-10, titled Automatic electrical controls for household and similar use – Part 2: Particular requirements for motor-starting relays. Published in 1994 under the auspices of the Canadian Standards Association (now the CSA Group), this standard specifies safety, performance, and construction requirements for motor-starting relays used in residential, commercial, and light industrial applications. These relays are typically found in appliances such as refrigerators, washing machines, dishwashers, air conditioners, and power tools where split-phase or capacitor-start motors require a reliable starting mechanism.
The standard applies to motor-starting relays operating at voltages up to 600 V and currents up to 63 A, and it covers both stand-alone relays and those integrated into other controls. It is intended to complement the general requirements of CAN CSA E60730-1 (the Canadian adoption of IEC 60730-1). The scope explicitly includes relays that are actuated by current, voltage, or temperature sensing to disconnect the start winding after motor start-up.
Note: CAN CSA E730-2-10-94 is harmonized with the international standard, facilitating trade while ensuring equipment meets Canadian safety expectations. Manufacturers exporting to Canada must verify that their motor-starting relays comply with this standard to obtain CSA certification.
Technical Requirements
Classification
Relays covered by this standard are classified according to their intended operating conditions, type of action, and environmental protection. Table 1 summarizes the main classification categories.
| Classification Parameter | Categories | Standard References |
|---|---|---|
| Rated impulse voltage | 1500 V, 2500 V, 4000 V | Clause 12.1 |
| Pollution degree | 1, 2, 3 | Clause 12.2 |
| Operating temperature range | -10 °C to +85 °C (typical) | Clause 12.3 |
| Type of action | 1 (normal), 2 (unintended operation safe) | Clause 12.4 |
| Protection against electric shock | Class I, Class II, Class III | Clause 13 |
Construction and Performance
CAN CSA E730-2-10-94 mandates stringent requirements for electrical insulation, dielectric strength, and thermal endurance. For example, the insulation between primary and secondary circuits must withstand a dielectric test voltage of 1250 V to 3000 V depending on the rated impulse voltage and pollution degree. Additionally, the standard specifies endurance testing under normal cycling conditions — typically 100,000 operations for general-purpose relays — with temperature rise limits not exceeding 65 K above ambient.
Motor-starting relays must also exhibit specific switching characteristics: the contact gap must be at least 1 mm for circuits above 250 V, and the actuation current (or voltage) tolerance is ±10 % of the nominal value. For current-sensing relays, the pick-up and drop-out current levels must be stable over the relay’s life.
Tip: When designing for compliance, pay particular attention to the required clearance and creepage distances specified in Table 15 of the standard. For a pollution degree 2 environment, the minimum clearance for a rated impulse of 2500 V is 1.5 mm.
Implementation Highlights
Design for Reliability
To achieve compliance with CAN CSA E730-2-10-94, manufacturers must integrate robust design practices. The standard expects that motor-starting relays will operate reliably under locked-rotor and overload conditions. This demands careful selection of contact materials (e.g., silver-cadmium oxide or silver-tin oxide) and thermal protection elements. The standard also requires that relays incorporate a fail-safe mechanism should a component failure occur, preventing sustained energization of the start winding.
Testing and Validation
Testing according to this standard includes a sequence of type tests covering:
- Dielectric strength and insulation resistance (both dry and after humidity treatment)
- Temperature rise under rated load
- Mechanical and electrical endurance
- Immunity to abnormal conditions (e.g., jamming of the relay armature)
For each relay model, the manufacturer must submit test reports to a recognized certification body such as CSA Group, Intertek, or UL. The standard accepts statistical sampling in accordance with ISO 2859 for production testing, but type tests must be performed on a set of three to five representative samples.
Warning: Relays that pass type tests without a dedicated test for abnormal load conditions (e.g., a locked-rotor simulation) may be rejected during factory inspection. Always include this test in your validation plan.
Marking and Documentation
Each relay must be legibly and durably marked with the manufacturer’s name, model number, electrical ratings, and the CSA certification mark. The standard also requires that the installation instructions include wiring diagrams, torque values for terminal screws, and a statement that the relay is intended for use only in equipment that complies with the relevant appliance safety standard.
Compliance and Certification
CAN CSA E730-2-10-94 is a mandatory basis for certification of motor-starting relays under the Canadian Electrical Code Part II. Obtaining CSA certification involves three steps:
- Documentation review: Submission of a technical file that includes detailed drawings, material specifications, and the test plan.
- Type testing: Testing performed by a CSA-accredited laboratory (or witnessed by a CSA inspector) against all applicable clauses.
- Factory inspection: An initial assessment of the manufacturing process and quality management system, followed by quarterly follow-up visits.
Once certified, the relay receives a unique file number and may bear the CSA Mark (or the CSA US Mark for the US market). The certificate is valid for an indefinite period provided no changes are made to the product design or manufacturing site without prior notification.
Non-compliance risk: Using a motor-starting relay that does not meet CAN CSA E730-2-10-94 in Canadian electrical products can lead to refusal of entry at customs, product recalls, and liability claims. Always verify the validity of the CSA certification for each production lot.
For manufacturers outside Canada, the standard is recognized by the Standards Council of Canada as an acceptable basis for compliance with provincial and territorial regulations. It is common for an IEC 60730-2-10 compliant relay to require only minor modifications (e.g., marking updates, additional thermal tests) to meet the Canadian version.
Frequently Asked Questions
Q: Is CAN CSA E730-2-10-94 identical to IEC 60730-2-10?
A: For the most part, yes. The Canadian adoption includes national modifications to reflect Canadian electrical code requirements, such as higher rated impulse voltages for certain applications and additional instructions for Class II equipment. Manufacturers should obtain the official CSA edition to review the deviations table in the foreword.
A: For the most part, yes. The Canadian adoption includes national modifications to reflect Canadian electrical code requirements, such as higher rated impulse voltages for certain applications and additional instructions for Class II equipment. Manufacturers should obtain the official CSA edition to review the deviations table in the foreword.
Q: What is the difference between a Type 1 and Type 2 relay per this standard?
A: Type 1 relays are designed to operate normally without causing a hazard in the event of a single fault, while Type 2 relays are required to remain safe even under two independent faults. Most household appliance applications use Type 1 relays, but safety-critical systems may require Type 2.
A: Type 1 relays are designed to operate normally without causing a hazard in the event of a single fault, while Type 2 relays are required to remain safe even under two independent faults. Most household appliance applications use Type 1 relays, but safety-critical systems may require Type 2.
Q: Can a relay meeting the 1994 version still be certified today?
A: Yes, as long as the product design remains unchanged and the standard has been confirmed by CSA (it has not been withdrawn). However, many newer products are certified to the 2003 or later amendments. Review the latest edition of CSA E730-2-10 for the most current requirements, though 1994 remains a valid designation.
A: Yes, as long as the product design remains unchanged and the standard has been confirmed by CSA (it has not been withdrawn). However, many newer products are certified to the 2003 or later amendments. Review the latest edition of CSA E730-2-10 for the most current requirements, though 1994 remains a valid designation.
Q: What are the typical costs for CSA certification of a motor-starting relay?
A: Costs vary by the complexity of the relay and the number of tests required, but typical budgets range from 15,000 CAD to 40,000 CAD including initial testing, factory inspection, and certification fees. Annual maintenance costs are additional.
A: Costs vary by the complexity of the relay and the number of tests required, but typical budgets range from 15,000 CAD to 40,000 CAD including initial testing, factory inspection, and certification fees. Annual maintenance costs are additional.
This article was prepared for informational purposes and reflects the state of CAN CSA E730-2-10-94 as of 2026. Always consult the official standard text for precise requirements and the latest amendments.