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CSA C22.2 No. 60745-2-20-05:2018 – Safety Requirements for Hand-Held Electric Band Saws
Scope, Key Technical Provisions, and Compliance Notes for Manufacturers and Certifiers
CSA C22.2 No. 60745-2-20-05 (2018) is the Canadian adoption of the international standard IEC 60745-2-20, which specifies particular safety requirements for hand-held motor-operated or magnetically driven electric band saws. This standard falls under the CSA C22.2 umbrella, the Canadian Electrical Code Part II covering safety of electrical equipment. It is intended to protect operators and bystanders from electrical, mechanical, thermal, and other hazards when using band saws for cutting wood, metal, plastics, and similar materials. The 2018 edition incorporates Canadian deviations and updates to reflect the latest reliability and safety practices. This article offers a detailed overview of the scope, technical requirements, implementation highlights, and compliance notes for manufacturers, certifiers, and technical personnel.
1. Scope and Application
CSA C22.2 No. 60745-2-20-05 (2018) applies to hand-held electric band saws with a rated voltage not exceeding 250 V for single-phase AC or DC tools, and 480 V for three-phase AC tools. It covers tools intended for professional and non-professional use, including those used in construction, metalworking, and woodworking. The standard addresses:
- Electrical, mechanical, thermal, and radiation hazards
- Marking, instructions, and information for safe use
- Constructional requirements such as enclosures, guards, and switching devices
- Test methods to verify compliance
Tools are classified by class (I, II, or III) and by moisture protection (ordinary, splash-proof, watertight). The standard does not cover band saws designed for stationary use, machines with separate power units, or tools used in explosive atmospheres.
Tip: Manufacturers should always verify the latest edition of CSA C22.2 No. 60745-2-20-05, as it may include amendments or corrigenda that affect design and testing.
2. Technical Requirements
The standard establishes comprehensive technical criteria for safety. Key requirements include:
2.1 Mechanical Guards and Protection
Band saws must be provided with a blade guard that automatically covers the blade when not in use. The guard must prevent accidental contact with the blade and withstand a static force of 10 N without deflection. A lower guard (rear guard) must enclose the blade below the table. Blade removal and replacement must be possible without special tools.
2.2 Electrical Safety
Insulation must comply with Class I or II requirements as applicable. Creepage distances and clearances follow IEC 60664-1. The tool must withstand a dielectric strength test of 1250 V for basic insulation and 3750 V for reinforced insulation (for Class II tools). A protective earth connection is required for Class I tools.
2.3 Switch and Controls
An automatically returning on/off switch (dead-man switch) is mandatory for hand-held band saws. The switch must prevent unintentional start-up and must be located such that the operator can access it without releasing the handle. Additional provisions include a lock-on device only if the tool is intended for continuous operation.
2.4 Noise and Vibration
The standard requires that the declared A-weighted sound pressure level (LpA) and hand-arm vibration emission (ah) be measured in accordance with ISO 3744 and ISO 5349, respectively. The information must be provided in the instruction manual.
2.5 Guard Opening and Blade Speed
The maximum permissible opening of the blade guard is limited to prevent finger entry. Blade speed at no load is limited to prevent excessive wear and breakage. Table 1 summarizes these critical dimensions.
| Parameter | Requirement | Test Condition |
|---|---|---|
| Maximum blade guard opening (upper guard) | ≤ 6 mm | Guard in rest position |
| Maximum blade guard opening (lower guard) | ≤ 10 mm | Guard in contact with workpiece |
| Blade speed at no load (for a typical 2000 W tool) | ≤ 45 m/s | Rated voltage ± 6% |
| Switch endurance | 100 000 cycles | Without failure |
| Minimum creepage distance (basic insulation) | 4 mm (AC 250 V) | Per IEC 60664-1 |
Warning: The guard dimensions and blade speed limits are critical for safety. Inadequate design may lead to severe injury. Always verify compliance through appropriate measurement and testing.
3. Implementation Highlights
Manufacturers integrating CSA C22.2 No. 60745-2-20-05 (2018) into their design and quality system should note the following:
- Risk assessment: A thorough risk assessment per ISO 12100 should be conducted to identify potential hazards specific to band saw operation.
- Instruction manual: Must include warnings about kickback, blade breakage, workpiece stability, and proper use of guards. Residual risks must be listed.
- Marking: The tool must bear the CSA mark or equivalent certification, and the following: manufacturer’s name, model number, voltage and frequency, power rating, and class symbol.
- Tool testing: Type tests include dielectric strength, abnormal operation, mechanical hazard test (with test probe), and endurance tests for guards and switches.
Success: Early integration of the standard’s requirements during the design phase reduces the likelihood of expensive redesigns and delays in certification.
4. Compliance and Certification Notes
Compliance with CSA C22.2 No. 60745-2-20-05 (2018) is mandatory for products intended for the Canadian market under the provincial electrical codes. Key points:
- Certification bodies: Recognized agencies such as CSA Group, UL, Intertek (ETL), and TÜV SÜD can certify tools to this standard. Testing is conducted in accredited laboratories.
- Factory inspections: Ongoing compliance may require periodic factory inspections to verify that production units consistently meet the certified design.
- Canadian deviations: This edition includes specific Canadian modifications to the base IEC standard, such as alternative test voltages for dual‑voltage tools and requirements for locking devices on switches.
- Transition periods: When a new edition is published, a transition period (usually 1–2 years) is allowed before mandatory enforcement. Check the latest CSA announcement.
Danger: Non‑compliant tools pose a risk of electric shock, blade contact injury, or fire. Selling uncertified equipment in Canada can lead to product recalls, fines, and legal liability.
Frequently Asked Questions
Q: Does CSA C22.2 No. 60745-2-20-05 (2018) apply to cordless (battery‑operated) band saws?
A: Yes, as long as the tool is hand‑held and motor‑operated. Cordless tools are covered as “magnetically driven” or motor‑operated, and the standard includes requirements for battery packs and chargers if supplied as part of the tool system. The voltage limits apply accordingly (typically up to 75 V DC for battery tools).
A: Yes, as long as the tool is hand‑held and motor‑operated. Cordless tools are covered as “magnetically driven” or motor‑operated, and the standard includes requirements for battery packs and chargers if supplied as part of the tool system. The voltage limits apply accordingly (typically up to 75 V DC for battery tools).
Q: What is the difference between this standard and the general standard CSA C22.2 No. 60745‑1?
A: CSA C22.2 No. 60745‑1 (IEC 60745‑1) is the general safety standard for hand‑held motor‑operated electric tools. The part‑2‑20 standard (No. 60745‑2‑20) provides particular requirements for band saws. It either modifies or replaces clauses in the general standard to address specific hazards of band saws. Both standards must be applied together.
A: CSA C22.2 No. 60745‑1 (IEC 60745‑1) is the general safety standard for hand‑held motor‑operated electric tools. The part‑2‑20 standard (No. 60745‑2‑20) provides particular requirements for band saws. It either modifies or replaces clauses in the general standard to address specific hazards of band saws. Both standards must be applied together.
Q: How often is the standard updated?
A: CSA standards are typically reviewed every 5 years. The 2018 edition replaced the 2005 edition. Users should monitor the CSA website for amendments or new editions.
A: CSA standards are typically reviewed every 5 years. The 2018 edition replaced the 2005 edition. Users should monitor the CSA website for amendments or new editions.
Q: Can a tool certified to IEC 60745‑2‑20 be accepted in Canada without retesting?
A: Not automatically. Because CSA C22.2 No. 60745‑2‑20‑05 includes Canadian national deviations, tools certified only to the international standard must be evaluated for these differences. However, many certification bodies accept IEC CB Test Reports and perform a gap analysis or additional testing for the Canadian requirements.
A: Not automatically. Because CSA C22.2 No. 60745‑2‑20‑05 includes Canadian national deviations, tools certified only to the international standard must be evaluated for these differences. However, many certification bodies accept IEC CB Test Reports and perform a gap analysis or additional testing for the Canadian requirements.