IEC 61010-1

IEC 61010-1 - Safety for Measurement, Control and Lab Equipment

Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements

Maintained byGiorgi Gaprindashvili PublishedFebruary 18, 2026 UpdatedJuly 19, 2026

What the measurement categories mean

IEC 61010-1 measurement categories describe where in the mains a meter is used. Closer to the service entrance means higher transient energy, so CAT IV needs more protection than CAT II.

Key facts

Full title: Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
Published by: IEC (TC 66)
Current edition: 3rd edition (2010) + Amendment 1 (2016), consolidated as IEC 61010-1:2010+AMD1:2016; Amendment 2 in draft (CDV 2025), expected around 2027
Replaces: 2nd edition (2001)
Applies to: Test & measurement, industrial process-control, and laboratory equipment
Status: Group safety publication under IEC Guide 104

Defined by function, not product category

What puts equipment under IEC 61010-1 is what it does - measure, test, monitor or control a physical or electrical variable - not the industry it sits in. A bench multimeter, a process controller and a lab centrifuge share the same baseline because they are all operated in technical settings, often by trained users, and frequently integrated into larger systems. Part 1 sets the common safety floor; particular parts (the 61010-2-xxx series) add requirements for specific equipment.

It addresses electric shock, fire, mechanical instability, thermal hazards and energy release, and describes the protective measures and construction expected to control them.

Measurement categories (CAT II to IV)

Instruments that connect to the mains to measure it are rated by measurement category - CAT II, III or IV - which mirrors the overvoltage categories and fixes how large a transient the input must survive. CAT II is for equipment connected at an outlet, CAT III for the fixed installation, CAT IV at the origin of the installation. In the 3rd edition the detailed measuring-circuit requirements moved into the particular standard IEC 61010-2-030.

These categories drive the same insulation-coordination logic - higher category means a higher impulse voltage and more clearance.

What the 3rd edition added

The 3rd edition widened the scope to all locations, professional and not, and added a risk-assessment route: Clause 17 for hazards not otherwise covered, plus annexes on reducing the pollution degree of a micro-environment, qualifying protective coatings, and determining the working voltage of a mains circuit - all of which feed directly into creepage and clearance design.

Tools that use this standard

Creepage & clearance calculator

Related standards

Standard	Relationship	What it means
IEC 61010-2 series	Extended by	Part 2 standards add particular requirements for specific equipment, for example 61010-2-030 for circuits with measurement terminals.
IEC 62368-1	Often confused with	Different scope: 61010-1 covers measurement, control and laboratory equipment; 62368-1 covers audio/video and IT equipment.
IEC 60664-1	Relies on	Uses the 60664-1 insulation-coordination method for creepage and clearance.

Frequently asked questions

What is IEC 61010-1 used for?

It is the general safety standard for electrical equipment used for measurement, control and laboratory work: test and measurement instruments, industrial process-control equipment and laboratory apparatus. It is scoped by the equipment's function rather than by a fixed product category.

What is the current edition of IEC 61010-1?

The governing base document is the 3rd edition (2010) with Amendment 1, commonly consolidated as edition 3.1. Part 1 is the general standard; particular equipment types add a Part 2, for example IEC 61010-2-030 for testing and measuring circuits. Verify the current edition and any later amendment before relying on it.

What do the measurement categories CAT II, III and IV mean?

They classify where an instrument may be safely connected, based on the transient overvoltage and the fault energy available at that point. CAT II covers circuits at socket outlets and plug-connected loads; CAT III covers the fixed building distribution such as switchgear and permanently wired equipment; CAT IV covers the origin of the supply such as the service entrance and utility connection, where fault energy is highest. CAT I covers circuits not connected to the mains.

Is a higher CAT number always better?

It is not better, it is a different environment. A higher category means the instrument is built to withstand the larger transients and fault energy found nearer the supply origin. The dangerous case is using an instrument rated below the category of the circuit being measured; the rating must meet or exceed the environment.

Is the CAT rating the same as the voltage rating?

No, and confusing the two is a common and dangerous mistake. The voltage rating is the steady working voltage; the CAT rating describes how much transient impulse energy the instrument can withstand. A meter can read up to 1000 V yet be rated only CAT II, so both the category and the voltage must suit the circuit.

What is the difference between IEC 61010-1 and IEC 62368-1?

They cover different equipment. IEC 61010-1 applies to measurement, control and laboratory equipment and uses measurement categories; IEC 62368-1 applies to audio/video and information and communication technology equipment and uses hazard-based safety engineering. A product is scoped to one or the other by its function.

Does IEC 61010-1 certify my instrument?

No. It defines safety requirements and test methods; demonstrating conformity for a given market is done through the applicable certification or declaration route against the current edition. The standard is the technical basis, not the approval itself.

Source: IEC webstore. An overview for design reference - verify against the current edition before relying on it for compliance.