CAN/CSA C22.2 No. 60745-2-3-07 (R2017): Technical Requirements for Hand-Held Grinders, Polishers, and Disk-Type Sanders

1. Scope and Application

CAN/CSA C22.2 No. 60745-2-3-07 (R2017) is the Canadian adoption of the international standard IEC 60745-2-3, with specific national modifications for the Canadian market. This standard applies to the safety of hand-held motor-operated electric tools specifically intended for grinding, polishing, and disk-type sanding. It covers tools with a rated voltage not exceeding 250 V for single-phase a.c. or d.c. tools, and 480 V for three-phase a.c. tools.

The standard addresses all significant hazards, hazardous situations, and events relevant to these tools when used as intended and under conditions of reasonably foreseeable misuse. It supplements the general requirements of CAN/CSA C22.2 No. 60745-1, the base standard for hand-held motor-operated electric tools.

Tools within the scope include angle grinders, straight grinders, vertical grinders, disk-type sanders, and polishers. The standard does not cover random-orbit sanders or belt sanders—those fall under other parts of the 60745 series (e.g., Part 2-4 for sanders and polishers, though disk-type padding tools are covered here).

2. Technical Requirements

2.1 Mechanical Safety

Mechanical hazards are a primary concern for grinders and polishers due to high rotational speeds, abrasive wheel fragmentation, and exposed moving parts. The standard mandates:

• Wheel Guarding: Tools must be fitted with a guard that provides protection against accidental contact with the abrasive wheel and contains fragments should wheel breakage occur. Guards must have a minimum covering angle of 180° for grinders and 90° for polishers (adjustable guard positions are permitted with tool-specific stop mechanisms).
• Spindle Lock: A spindle locking mechanism must be provided to allow safe and easy wheel removal, requiring the tool to be disconnected from the supply before engagement.
• Maximum No-Load Speed: The no-load rotational speed must not exceed the maximum permissible speed marked on the abrasive wheel or backing pad. The standard specifies methods for speed verification under rated voltage conditions.
• Rotational Direction: For grinders using threaded wheel mountings, the spindle rotation direction must be such that the mounting nut tends to tighten during operation; this prevents unintended loosening.

2.2 Electrical Safety

In addition to the general electrical safety requirements of the base standard (clearances, creepage distances, insulation, earthing), Part 2-3 imposes specific electrical requirements for the harsh conditions typical of grinding and polishing operations:

• Ingress Protection (IP): Tools must have an IP rating of at least IPX4 (splash-proof) to cope with wet environments. The standard requires testing by exposing the tool to a simulated rain storm for 5 minutes while rotating.
• Insulation Resistance and Dielectric Strength: No reduction factors are allowed for the base standard requirements. Insulation must withstand the higher leakage currents caused by fine conductive dust (e.g., graphite, metal filings) that can penetrate the tool.
• Supply Connection: The flexible cable must be of a heavy-duty type (e.g., polychloroprene or equivalent), with a minimum cross-sectional area of 1.0 mm² for tools rated up to 10 A and 1.5 mm² for higher currents.
• Creepage Distances: Additional creepage requirements apply between live parts and accessible conductive parts when tools are operated in conductive dust atmospheres.

2.3 Controls and Handling

The standard sets requirements for start/stop controls, locking devices, and switches to ensure safe handling of these powerful tools:

• Switch Locking: A locking device (e.g., a paddle switch with a lock-on button) is permitted only if the tool can be released by a single hand motion from the same grip. The lock-on device must not be positioned where accidental engagement is likely.
• Two-Hand Operation: Grinders above 2.5 kg or with a wheel diameter exceeding 125 mm must be designed for two-hand operation (auxiliary handle mandatory). The standard specifies handle location, shape, and dimensional constraints.
• Restart Protection: Tools must be designed such that after a power interruption (e.g., loss and restoration of supply), the tool shall not restart automatically if it was operated with a lock-on switch. This requirement prevents unexpected tool startup when power is restored.
• Vibration Emission: In accordance with the base standard, the tool must be tested for hand-arm vibration and the declared emission value must be included in the instructions. Annex D of Part 2-3 gives guidance on measurement positions (e.g., on the main handle and auxiliary handle).

3. Implementation and Testing

Manufacturers seeking to certify a product under CAN/CSA C22.2 No. 60745-2-3 must follow the type-testing protocols defined in the standard. Testing may be performed at the manufacturer’s own accredited laboratory or through a recognized third-party testing body such as CSA, Intertek, or UL.

Key testing highlights include:

• Temperature Rise Test: The tool is operated at rated voltage under maximum load in cycles of 30 seconds on, 30 seconds off, until steady-state temperatures are reached. Winding temperatures are measured by resistance method, and must not exceed the class insulation limit (Class A: 105 °C, Class B: 130 °C, etc.).
• Spindle Lock Torque Test: The spindle lock button is engaged and a torque of 1.1 N·m is applied in the loosening direction. The lock must hold without slipping or damage.
• Wheel Burst Containment: The guard is tested by rotating a specially fabricated weak abrasive wheel at 1.1 times the normal maximum speed until fracture. The guard must contain the fragments.
• Drop Test: The tool is dropped three times from a height of 1 m onto a concrete floor in the orientation most likely to cause guard distortion. After the test, the guard must still meet the coverage and deflection limits.
• Resistance to Abrasive Dust: The tool is operated while exposed to a metered flow of fine aluminum oxide dust for 2 hours. After the test, the tool must still start and operate normally, and the dust must not bridge live parts.

4. Compliance and Certification

Compliance with CAN/CSA C22.2 No. 60745-2-3 is typically required for product safety certification for sale in Canada. The standard is referenced by the Canadian Electrical Code (CE Code, Part I) for all hand-held grinding and polishing tools used in workplaces and homes.

Certification Mark: Accepted marks include CSA (Canadian Standards Association) or other accredited agency marks such as cUL, cETL, or cFM. All certifications must include the tool’s compliance with this Part 2 standard in conjunction with the Part 1 standard.

Documentation Requirements: The manufacturer must deliver a user manual that includes:

• Instructions for safe mounting and removal of abrasive wheels and backing pads.
• Maximum allowable wheel diameter and speed rating.
• Protective equipment recommendations (eye, ear, respiratory, hand protection).
• Guidance on avoiding kickback and maintaining control under load.
• Vibration emission declared value and daily exposure limits per ISO 5349.

Market Surveillance: CSA periodically conducts market surveillance audits to ensure that certified products continue to meet the requirements. Any significant changes in design, materials, or production processes must be notified to the certification body.

This article is for informational purposes only and does not constitute legal or certification advice. Always refer to the latest official version of CAN/CSA C22.2 No. 60745-2-3-07 (R2017) and consult a qualified certification body. — 2026