Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
CAN/CSA C22.2 No. 61010-031-17: Safety Requirements for Hand-Held Probe Assemblies in Electrical Test and Measurement
A comprehensive examination of the Canadian adoption of IEC 61010-031, covering scope, technical criteria, and compliance for probe assemblies used in electrical testing environments
Hand-held and hand-manipulated probe assemblies are essential accessories for electrical test and measurement instruments. Their direct contact with energized circuits demands rigorous safety design and verification. CAN/CSA C22.2 No. 61010-031-17 (adoption of IEC 61010-031:2015) establishes the safety requirements for these devices in Canada, covering test leads, probes, clips, and similar accessories rated up to 1,000 V AC or 1,500 V DC. This article examines the standard’s scope, key technical requirements, implementation aspects, and certification pathways.
Scope and Purpose
CAN/CSA C22.2 No. 61010-031-17 applies to probe assemblies that are held or manipulated by hand during normal operation and intended for use with equipment covered by the IEC 61010 series (e.g., multimeters, oscilloscopes, power analyzers). The standard covers:
- Voltage-rated probes: up to 1,000 V AC or 1,500 V DC
- Current probes: direct and clamp-on types
- Accessories such as alligator clips, test pins, and crocodile clips
- Cable assemblies and connector blocks integral to the probe
The purpose is to protect users and surrounding equipment from electric shock, mechanical hazards, excessive temperature, and arc flash. The standard complements Part 010 of the C22.2 series, which addresses the measurement equipment itself.
Tip: Although CAN/CSA C22.2 No. 61010-031-17 is technically identical to IEC 61010-031:2015, Canadian regulations require equipment to be certified under the C22.2 framework. Always reference the CSA designation for compliance in Canada.
Technical Requirements
This section summarizes the major technical criteria that probe assemblies must satisfy. The standard uses a hierarchical approach: basic requirements (e.g., general electrical safety) are taken from IEC 61010-1, while additional or modified clauses are specific to probe assemblies.
Protection Against Electric Shock
Probes must provide insulation between the user’s hand and any live conductive part. The standard specifies:
- Working voltage (Uw): The maximum continuous voltage that can be applied between probe tip and reference.
- Overvoltage category (CAT I, II, III, or IV) based on the transient voltage environment. Higher categories require greater creepage and clearance distances.
- Pollution degree (PD2 or PD3) depending on expected condensation and contamination.
The minimum insulation thickness for hand-held parts is 2 mm for reinforced insulation (or 1 mm for basic plus supplementary).
Dielectric Voltage-Withstand Test
Every probe assembly must pass a type test that applies a voltage 1.5 to 2 times the peak working voltage (or the rated impulse withstand voltage) without breakdown. The test typically lasts 5 seconds.
| Requirement | Test Condition | Acceptance Criterion |
|---|---|---|
| Dielectric withstand | Apply 1.2/50 μs impulse voltage at rated peak for overvoltage category or AC/DC test voltage per Table 1 of the standard. | No flashover or breakdown; leakage current ≤ 5 mA (AC) or 2 mA (DC). |
| Insulation resistance | Measure after dielectric test; apply 500 V DC for 60 s. | Resistance ≥ 1 MΩ (typically ≥ 10 MΩ for clean, dry conditions). |
| Protective conductor resistance | For probes with protective earth connection: measure from probe tip to earth terminal. | Resistance ≤ 0.2 Ω (for cable length < 2 m; longer cables allowed higher). |
Mechanical Strength and Impact Resistance
Hand-held probes must withstand drops, impacts, and pull forces without exposing live parts. Key tests include:
- Handle impact test: A 1 kg steel mass is dropped from 0.3 m onto the probe handle; no cracking or exposure of conductive parts allowed.
- Cable pull and torque: Cables are subjected to a 100 N pull for 1 minute and a 0.25 N·m torque. The probe must remain intact with no interruption of the shield or conductor.
- Component bending: Probe tips are bent 15° in two directions; no permanent deformation beyond limits.
Caution: The mechanical strength requirements are especially critical for probes used in industrial environments (CAT III & IV). A probe that fails an impact test could generate an arc flash during subsequent use. Always select probes with a mechanical rating suitable for the environment.
Thermal and Flammability Requirements
Probe components that can reach temperatures above 60°C during normal operation must be marked with a warning symbol or temperature rating. Additionally, all plastic materials must meet the flammability class V-2 or better per IEC 60695-11-10. The probe handle must not exceed 55°C under rated load.
Implementation Highlights
Manufacturers designing probes to CAN/CSA C22.2 No. 61010-031-17 should consider the following practical aspects:
- Marking and identification: Each probe must be permanently marked with the manufacturer’s name or trademark, model number, rated voltage and current, overvoltage category, and the CSA certification mark (once certified).
- Instruction manual: Must include warnings about safe use, cleaning, recommended test procedures, and the overvoltage category designation.
- Test plan documentation: A complete set of type test records (dielectric, mechanical, thermal) must be maintained for each probe family.
- Component audit: Plastic materials, cable jackets, and connectors should be sourced with documented flammability and temperature ratings.
Best practice: Incorporate a redundant insulation barrier (e.g., a double insulation wall) in the probe handle design. This not only ensures compliance with reinforced insulation requirements but also increases design margin for unforeseen field conditions.
Compliance and Certification Notes
Compliance with CAN/CSA C22.2 No. 61010-031-17 is required for probe assemblies sold or used in Canada under provincial safety regulations (e.g., Ontario’s Electrical Safety Code). Certification is typically performed by a Recognized Certification Organization (RCO) such as CSA Group or Intertek. The certification process involves:
- Application review – including the technical dossier and component ratings.
- Sample testing – all type tests specified in the standard are conducted on representative samples.
- Factory inspection – initial and periodic audits of the manufacturing line.
- Labeling and follow-up – the probe is authorized to bear the CSA mark and undergoes annual surveillance testing.
Important difference from IEC certification: The CSA C22.2 version may include Canadian deviations (e.g., for marking language, environmental conditions, or fusing requirements). It is essential to consult the official CAN/CSA publication for the exact text.
Critical compliance note: Using a probe certified only to IEC 61010-031 without CSA endorsement may not be accepted by Canadian enforcement authorities. A separate CSA certification (or CB scheme with national differences) is mandatory for legal sale and use in Canada.
Common Deficiencies Found During Testing
- Insufficient creepage distance at the probe tip/guard interface (especially for CAT IV applications).
- Flammability rating of plastic handle lower than V-2.
- Cable jacket material not meeting the -10°C flexibility requirement (for cold environments).
- Inadequate marking permanence after solvent and abrasion tests.
Q: What is the difference between IEC 61010-031:2015 and CAN/CSA C22.2 No. 61010-031-17?
A: The Canadian edition adopts the IEC text verbatim for technical content but adds front matter, a national foreword, and possibly minor revisions (e.g., referencing Canadian Electrical Code requirements). The core safety tests and limits remain identical. However, certification must be obtained under the CSA C22.2 framework for acceptance in Canadian jurisdictions.
A: The Canadian edition adopts the IEC text verbatim for technical content but adds front matter, a national foreword, and possibly minor revisions (e.g., referencing Canadian Electrical Code requirements). The core safety tests and limits remain identical. However, certification must be obtained under the CSA C22.2 framework for acceptance in Canadian jurisdictions.
Q: Are passive multimeter test leads included in the scope of this standard?
A: Yes, any hand-held or hand-manipulated accessory that is intended to be connected to the test equipment and that directly contacts the circuit under test (including test leads, probes, alligator clips, and hook clips) is within the scope. Permanently attached accessories may be evaluated as part of the instrument under IEC 61010-1, but separate probe assemblies require compliance to Part 031.
A: Yes, any hand-held or hand-manipulated accessory that is intended to be connected to the test equipment and that directly contacts the circuit under test (including test leads, probes, alligator clips, and hook clips) is within the scope. Permanently attached accessories may be evaluated as part of the instrument under IEC 61010-1, but separate probe assemblies require compliance to Part 031.
Q: Can a probe assembly have multiple overvoltage ratings (e.g., CAT III 600 V / CAT II 1000 V)?
A: Yes. The standard permits dual or multiple ratings provided each rating meets the corresponding creepage/clearance and test voltage requirements. Both ratings must be marked, and the probe must pass the most demanding test (typically the higher CAT rating). The instruction manual should clarify the proper use case for each rating.
A: Yes. The standard permits dual or multiple ratings provided each rating meets the corresponding creepage/clearance and test voltage requirements. Both ratings must be marked, and the probe must pass the most demanding test (typically the higher CAT rating). The instruction manual should clarify the proper use case for each rating.
Q: How often must the factory be inspected after certification?
A: ISO/IEC 17025-based certification bodies typically require an initial factory audit followed by annual surveillance visits. During each visit, random samples are taken for confirmatory testing (e.g., dielectric test, pull test). Failure to maintain the required quality level can result in suspension of the certification.
A: ISO/IEC 17025-based certification bodies typically require an initial factory audit followed by annual surveillance visits. During each visit, random samples are taken for confirmatory testing (e.g., dielectric test, pull test). Failure to maintain the required quality level can result in suspension of the certification.
— Published as CAN/CSA C22.2 No. 61010-031-17 (adopted 2017, reaffirmed 2022). Technical guidance for compliance under the C22.2 series. This article updated 2026.