IEC 61010: safety of laboratory and measurement equipment
Guide - IEC 61010
IEC 61010-1 is the horizontal electrical-safety standard for measurement, control, process-control and laboratory equipment. Published by the International Electrotechnical Commission and maintained by Technical Committee TC 66, it replaced the historical IEC 348 in 1990 and today provides, in its consolidated edition 3.1 (edition 3 of 2010 amended in 2016 and 2018), the reference framework for multimeters, oscilloscopes, laboratory power supplies, automatic test equipment, semiconductor manufacturing equipment, industrial controllers and in vitro diagnostic instruments. IEC 61010-1 is the horizontal sister of IEC 62368-1 (audio video, IT and communications equipment) and IEC 60601-1 (medical electrical equipment). This page covers the historical trajectory of the standard, the 61010-1 plus 61010-2-xxx particular structure, measurement categories CAT-I to CAT-IV, pollution degrees PD1 to PD4, insulation classes, the typical test sequence, the articulation of EN 61010-1 under the Low Voltage Directive and UL 61010-1 under the US NRTL regime, and the pitfalls observed in practice.
History and trajectory
Section titled “History and trajectory”The standard followed a multi-edition trajectory. The table below lists the milestones documented by IEC.
| Stage | Year | Content |
|---|---|---|
| IEC 348 | up to 1990 | Historical safety standard for electronic measuring apparatus, superseded by IEC 61010-1 |
| Edition 1 | 1990 | First publication of IEC 61010-1, modern horizontal framework for measurement, control and laboratory equipment |
| Edition 2 | 2001 | Consolidation, structuring of the 61010-2-xxx particulars, alignment with general electrotechnical principles |
| Edition 3 | 2010 | Major restructuring, alignment with hazard-based safety engineering principles, in parallel with the 62368-1 work |
| Amendment 1 | 2016 | First amendment to edition 3, clarifications, industry feedback |
| Amendment 2 | 2018 | Second amendment, UL and CSA alignments |
| Consolidated edition 3.1 | 2018 | Edition 3 plus AMD1 plus AMD2 consolidated, current version in the IEC catalogue |
The transition from IEC 348 to IEC 61010-1 in 1990 marked the move from a vertical standard specific to electronic measuring apparatus toward a horizontal standard covering the full measurement, control and laboratory scope. Test reports based on IEC 348 carry no presumption of conformity for new market placement. An edition 1 (1990) or edition 2 (2001) report carries the same risk today: it references a text that is no longer the current catalogue version and no longer the active harmonised version under the Low Voltage Directive.
Edition 3 of 2010 introduced a notable alignment with general hazard-based safety engineering principles, principles that also structure IEC 62368-1 published the same year. The two standards remain distinct in scope but share the underlying logic of identifying energy sources and matching the protective means to the residual hazard. The consolidated edition 3.1 published after amendment 2 of 2018 is the reference version used today in test campaigns.
Structure: 61010-1 plus the 61010-2-xxx family
Section titled “Structure: 61010-1 plus the 61010-2-xxx family”IEC 61010 is organised in a horizontal-plus-particulars architecture. Part 1 (61010-1) contains the general requirements applicable to every product in scope. The 2-xxx parts (61010-2-xxx) add, modify or remove specific requirements for a product category. Correct application requires reading 61010-1 plus the applicable 2-xxx particular(s), then combining the requirements according to the articulation rules published in each particular standard.
The table below lists a selection of particulars (non-exhaustive; the IEC catalogue publishes the up-to-date list).
| Reference | Scope |
|---|---|
| IEC 61010-1 | General horizontal requirements (all categories) |
| IEC 61010-031 | Hand-held probe assemblies and accessories for measuring instruments |
| IEC 61010-2-010 | Laboratory equipment for the heating of materials |
| IEC 61010-2-020 | Laboratory centrifuges |
| IEC 61010-2-030 | Equipment having testing or measuring circuits (testing of manufactured products) |
| IEC 61010-2-032 | Hand-held and hand-manipulated current sensors for electrical test and measurement |
| IEC 61010-2-033 | Hand-held multimeters and other meters for domestic and professional use |
| IEC 61010-2-040 | Sterilisers and washer-disinfectors for products used in medical laboratories |
| IEC 61010-2-051 | Laboratory equipment for mixing and stirring |
| IEC 61010-2-081 | Automatic and semi-automatic laboratory equipment for analysis and other purposes |
| IEC 61010-2-091 | Laboratory X-ray cabinet systems |
| IEC 61010-2-101 | In vitro diagnostic (IVD) medical equipment |
| IEC 61010-2-201 | Industrial process and control equipment (programmable controllers, industrial controllers) |
Several particulars deserve a specific note.
- IEC 61010-2-201 is one of the largest particulars in the family. It applies to industrial programmable controllers (PLCs) and process controllers used in automated production lines. It largely replaces the older industrial-automation-specific references and is now the standard route for CE and NRTL certification of PLCs.
- IEC 61010-2-040 and 61010-2-101 cover laboratory equipment used in a medical context but must not be confused with IEC 60601-1. The boundary criterion is direct patient contact: if the equipment includes an applied part in patient contact, it falls under 60601-1. If the equipment processes samples or consumables without direct patient contact (sterilisation, IVD processing on a sample), it remains under 61010.
- IEC 61010-031 and 61010-2-032 cover hand-held accessories. A multimeter probe, a current clamp or a hand-held current sensor is a standalone product that requires its own conformity file, separate from the instrument it connects to.
Measurement categories CAT-I to CAT-IV
Section titled “Measurement categories CAT-I to CAT-IV”Measurement categories are one of the specific contributions of 61010 and have no direct equivalent in 62368-1 or 60601-1. They classify the electrical environment of the application of a measurement or test instrument according to available energy and the presence of transient overvoltages.
| Category | Environment | Typical examples |
|---|---|---|
| CAT-I | Circuits not directly connected to mains, low-energy signals | Laboratory electronics behind an isolation transformer, battery-powered R&D measurements, telecommunication signalling |
| CAT-II | Branch circuits of mains-connected appliances | Household outlets, single-phase standard loads, measurements on household appliances, end-user outlet audit |
| CAT-III | Distribution circuits inside buildings | Sub-panels, industrial cabinets, industrial motors, permanently installed lighting, three-phase building distribution |
| CAT-IV | Origin of the installation on the utility side | Service entrance, meters, overhead lines, first circuit breaker downstream of the transformer |
The categories come with rated voltages under which the instrument is qualified to operate in the presence of the transient overvoltages typical of the category. The exact numerical values are tabulated in the normative text and must be read directly from the IEC publication, since they may be adjusted across amendments. A typical multimeter is marked, for example, CAT-III 600 V or CAT-IV 300 V, indicating both the maximum category of use and the rated voltage within that category.
Choosing the category is an engineering decision that structures the entire instrument design: input circuits, fuses, transient protections, clearance and creepage, probe mechanical robustness. An instrument designed for CAT-II cannot simply be re-marked CAT-III without redesigning the input circuits, and using a CAT-II instrument in a CAT-III environment is a direct hazard to the operator.
Pollution degrees PD1 to PD4
Section titled “Pollution degrees PD1 to PD4”The pollution degree characterises the equipment environment in terms of contamination and condensation. The pollution degree combined with the working voltage determines the minimum clearance distances in air and creepage distances required between conductors on PCBs, in insulation components and at the input/output interface.
| Degree | Environment | Typical application |
|---|---|---|
| PD1 | No conductive pollution, no condensation | Air-conditioned laboratory, clean room, sealed enclosure |
| PD2 | Non-conductive pollution, occasional condensation | Office, light workshop, clean industrial environment, controlled environment |
| PD3 | Conductive pollution, condensation expected | General industrial environment, production workshop, manufacturing area |
| PD4 | Permanent conductive pollution, water or vapour present | Wet environment, unsheltered outdoor, industrial wet zones |
The classification is documented in the technical file and marked on the product where applicable. A frequent non-conformity comes from defaulting to PD2 on an industrial product actually deployed in a workshop where conductive pollution is permanent (carbon dust, metal chips, oil mist). The designer must interrogate the real use context, not the laboratory environment where the product is validated. Reviewing the user documentation (declared environmental limits) is a simple cross-check.
Insulation classes I, II, III
Section titled “Insulation classes I, II, III”61010 retains the classical insulation classes of electrotechnology to characterise the primary means of protection against electric shock.
| Class | Principle | Marking |
|---|---|---|
| Class I | Basic insulation plus protective-earth bonding of accessible metallic parts | Protective-earth symbol on the enclosure and cord |
| Class II | Double or reinforced insulation, no protective earth | Square-within-a-square symbol (double insulation) |
| Class III | Powered from safety extra-low voltage (SELV), no hazardous voltage inside | Diamond symbol with the voltage value |
The class choice drives the electrical and mechanical architecture. A mains-powered laboratory instrument is typically Class I if its enclosure has accessible metallic parts, or Class II if its enclosure is fully insulating and incorporates double internal insulation. A measurement sensor powered by a low-voltage cord from an external module can be Class III, provided the voltage stays within the SELV envelope defined by the standard.
As with 62368-1, the requirements on clearance distance, creepage distance and dielectric strength are tabulated against the working voltage, the overvoltage category, the pollution degree and the source energy class. Exact values must be read from the normative text.
Relationship to the other horizontal standards
Section titled “Relationship to the other horizontal standards”The 61010 scope is positioned by implicit exclusion against the other horizontal electrical-safety standards. The table below frames the boundaries.
| Standard | Scope | Typical boundary |
|---|---|---|
| IEC 61010-1 | Measurement, control and laboratory equipment | Multimeters, oscilloscopes, laboratory power supplies, programmable controllers, IVD equipment without patient contact |
| IEC 62368-1 | Audio video, IT and communications equipment | Computers, servers, networking equipment, televisions (see the IEC 62368-1 guide) |
| IEC 60601-1 | Medical electrical equipment with patient contact | Equipment including an applied part in direct patient contact (see the IEC 60601-1 guide) |
| IEC 60335 | Household and similar electrical appliances | Coffee machines, ovens, vacuum cleaners, hand-held domestic power tools |
The boundary is determined by the declared use scope in the product documentation, not by the internal technology. Three frequent cases illustrate the rule.
- An oscilloscope integrating modern IT electronics (processor, touchscreen, embedded OS) remains a measurement instrument: it falls under 61010-1, not 62368-1.
- An industrial programmable controller (PLC) falls under 61010-2-201 and therefore under the 61010 family, even though its electronics are strictly informatic.
- An IVD analyser that processes a blood sample on a single-use consumable, without direct patient contact, falls under 61010-2-101 and under the IVDR on the regulatory side, but stays outside the scope of 60601-1, which would require an applied part in patient contact.
On borderline products (for example a laboratory instrument with a professional-grade user-interface display), the boundary rationale must often be documented in the technical file and discussed with the certification body ahead of the test campaign.
Hazard identification and protection methods
Section titled “Hazard identification and protection methods”61010 organises the safety analysis around an inventory of hazards present in the equipment. The scope of the standard covers six broad hazard families.
- Electric-shock hazard: accessible voltages and currents, energy stored in reservoir capacitors, insulation failures.
- Thermal hazard: accessible hot surfaces, hot fluids, overheating under abnormal operation, blocked ventilation.
- Mechanical hazard: moving parts, springs, rotating masses (centrifuges, fans), sharp edges, projections.
- Fire hazard: component heating, propagation, enclosure materials, forced ventilation, internal short circuit.
- Hazard from fluids and liquids: sealing, leaks, chemical reactions, chassis retention.
- Radiation hazard: laser, ultraviolet, microwave, X-ray (covered by 61010-2-091 for X-ray cabinets), radioactive sources.
For each hazard, the sequence is inventory, evaluation, protection. Protection relies on the combination of primary means (insulation, separation, containment) and secondary means (protective device, signage, user instructions). The hierarchy is the classical one: eliminate the hazard by design, otherwise contain it through a protective means, otherwise warn through marking and documentation.
This structure is close to the HBSE logic of 62368-1 without however adopting its exact terminology (ES, PS, TS, MS classes). 61010 retains a more traditional vocabulary rooted in laboratory and industrial electrotechnology practice.
Typical test sequence
Section titled “Typical test sequence”A 61010 test campaign runs in an ISO/IEC 17025 accredited laboratory on the electrical-safety scope and combines documentary and physical bench work on a prototype.
- upstream documentary review: hazard identification, protection plan, schematics, mechanical exploded view, datasheets for critical components (transformers, optocouplers, fuses, varistors), list of enclosure materials with their UL 94 classification, declaration of measurement categories and pollution degrees applicable,
- dielectric-strength (hi-pot) tests: AC or DC test voltages applied to every declared insulation interface, dimensioned on the working voltage plus the transient margin of the category,
- protective-earth continuity tests (Class I): bond impedance between accessible metallic parts and the cord earth terminal, under high test current,
- insulation-resistance tests: steady-state DC measurement, comparison with tabulated thresholds,
- leakage-current tests: earth leakage and accessible-part touch currents, under normal and single-fault conditions,
- abnormal-operation tests: short-circuit of components, blocking of moving parts (essential for the centrifuge and mixing particulars), simulated overheating, regulator failure,
- thermal tests: steady-state surface temperatures, single-fault thermal evaluation,
- mechanical tests: enclosure robustness, stability, suspension strength, particular-specific tests (for example emergency-stop on a centrifuge, lid integrity after rotor imbalance under 61010-2-020),
- accessibility tests: application of the standardised test finger to accessible parts, verification that potentially hazardous zones are inaccessible to a foreign object or to a finger without a tool,
- downstream documentary work: drafting of the test report in the IECEE CB format for multinational certification.
For the test sequence in the CE context, see the CE tests page. For the list of LVD harmonised standards, see the CE standards page.
See also
Section titled “See also”- EN 60335: safety of household electrical appliances
- EN 60598: safety of LED and conventional luminaires
- EN 62471 and EN 60825: photobiological and laser safety
- IEC 60945: maritime navigation + radiocomm
EN 61010-1 and the Low Voltage Directive
Section titled “EN 61010-1 and the Low Voltage Directive”In the European Union, the electrical safety of measurement, control and laboratory equipment is governed by Directive 2014/35/EU (Low Voltage Directive, LVD). EN 61010-1 is the European transposition of IEC 61010-1, published by CENELEC. It is listed as a harmonised standard under the LVD through notices in the Official Journal of the European Union. The applicable EN 61010-2-xxx particulars (for example EN 61010-2-201 for industrial controllers) are also listed for their respective scopes.
Applying EN 61010-1 (and the relevant 2-xxx particular where applicable) in the harmonised version grants presumption of conformity with the essential safety objectives of the LVD for the equipment categories covered. The manufacturer relying on this presumption:
- declares conformity with EN 61010-1 (and 2-xxx particulars) in the EU Declaration of Conformity,
- attaches the test report and supporting evidence to the technical file made available to market-surveillance authorities,
- records the normative references in the marking and the user documentation as required by the directive.
The exact reference of the harmonised edition, the integrated amendments and the eventual cessation date is published on the official European Commission page dedicated to the LVD. The list evolves with successive communications, and the pinned edition must be verified before launching a test campaign whose report needs to retain its value over the targeted commercial cycle.
UL 61010-1 in the United States and CSA C22.2 No. 61010-1 in Canada
Section titled “UL 61010-1 in the United States and CSA C22.2 No. 61010-1 in Canada”In the United States, the electrical safety of measurement, control and laboratory equipment is administered through OSHA-recognised NRTLs. UL 61010-1, published by UL Standards & Engagement, is the US transposition of IEC 61010-1 with national deviations (protective earthing, cordage and plug requirements per the National Electrical Code (NEC), fusing, marking). In Canada, the transposition is CSA C22.2 No. 61010-1, published by the CSA Group.
Certification is materialised by an NRTL mark applied on the product, the end-point of a dossier comprising the test report compliant with UL 61010-1, the Initial Production Inspection at the manufacturing sites and a periodic follow-up. UL 61010-2-xxx and CSA C22.2 No. 61010-2-xxx particulars exist in parallel with the IEC 61010-2-xxx particulars, with documented national deviations.
As with 62368-1, a single test report in the IECEE CB format can cover the IEC, EN, UL and CSA scopes provided national deviations are applied. The FCC does not act on electrical safety: its scope is limited to electromagnetic compatibility (Part 15 and Part 18) and radio-spectrum use. Electrical safety in the United States is exclusively administered through the NRTL route.
Pitfalls observed in the field
Section titled “Pitfalls observed in the field”Several recurring findings appear in certification-body and NRTL feedback.
- Keeping an IEC 348 report or a 61010-1 edition 1 or edition 2 report. These editions are no longer the current catalogue version nor the active harmonised version under the LVD. A technical file relying on these references no longer benefits from presumption of conformity and constitutes a direct risk in a market-surveillance review.
- Omitting the applicable 2-xxx particular. Covering an industrial programmable controller with 61010-1 alone (without 61010-2-201), a laboratory centrifuge without 61010-2-020, or an IVD instrument without 61010-2-101 leaves the product-specific hazards untested (rotor failure on a centrifuge, functional safety on a PLC, fluid management on IVD).
- Under-rating the measurement category. A multimeter marked CAT-III 600 V used on a sub-panel of an industrial building where CAT-IV transients can occur is under-rated. The error is hazardous: the category protects the operator against transient overvoltages typical of the environment. An insufficient category exposes to electric arc and severe injury.
- Defaulting to PD2 classification. Industrial equipment actually deployed in a production workshop is typically in PD3 (conductive dust, metal chips, oil mist). Defaulting to PD2 out of convenience or habit artificially reduces the required clearance and creepage, which translates into premature in-service arcing.
- Wrong assumptions on accessible parts. The standard defines accessibility through the standardised test finger and through the required dismantling conditions. A non-removable external plastic enclosure is not necessarily out of scope: it must withstand the mechanical tests and the internal parts must remain inaccessible per the test-finger procedure.
- Confusion between electrical safety and EMC. EN 61010-1 and the LVD cover electrical safety. Electromagnetic compatibility falls under Directive 2014/30/EU and under EN 61326 (electrical equipment for measurement, control and laboratory use - EMC requirements) for the 61010 scope. A product certified to the LVD cannot be CE marked without a separate EMC demonstration.
- Outsourcing testing without verifying NRTL scope. A laboratory accredited ISO/IEC 17025 on 61010-1 is not necessarily authorised to issue an NRTL mark in the United States. The commercial mark requires an OSHA-recognised NRTL certification body. The scope of OSHA recognition must be verified before ordering testing.
Going further
Section titled “Going further”This page covers the general framework of IEC 61010-1 and the 61010-2-xxx family. The specific terminology (measurement category, pollution degree, insulation class, test finger) is defined in the glossary. For the broader CE marking context and the full regulatory sequence, see the CE harmonised standards page and the CE tests page. For the comparison with the two other horizontal electrical-safety standards, see the IEC 62368-1 guide (audio video, IT, communications) and the IEC 60601-1 guide (medical).
Sources & references
- IEC 61010-1 ed. 3.1, Safety requirements for electrical equipment for measurement, control, and laboratory use, Part 1 General requirements , IEC webstore.iec.ch/publication/4231
- IEC 61010-2-201, Safety requirements for electrical equipment for measurement, control and laboratory use, Part 2-201 Particular requirements for control equipment , IEC webstore.iec.ch/publication/64643
- IEC 61010-031, Safety requirements for electrical equipment for measurement, control, and laboratory use, Part 031 Safety requirements for hand-held probe assemblies , IEC webstore.iec.ch/publication/4274
- UL 61010-1, Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use, Part 1 General Requirements , UL Standards www.shopulstandards.com/
- Directive 2014/35/EU on Low Voltage equipment (LVD) , EUR-Lex eur-lex.europa.eu/eli/dir/2014/35/oj
- Harmonised standards under the Low Voltage Directive , European Commission single-market-economy.ec.europa.eu/single-market/european-standards/harmonised-standards/low-voltage_en
- IEC TC 66, Safety of measuring, control and laboratory equipment , IEC www.iec.ch/dyn/www/f?p=103:7:::::FSP_ORG_ID:1300