IEC 61010 defines safety requirements for electrical equipment used in measurement, control and laboratory applications. It covers instruments, process controllers, data acquisition systems and test equipment — ensuring protection against electrical shock, fire, mechanical hazards and excessive temperatures.
IEC 61010-1 The main safety standard for measuring, controlling, and laboratory equipment. Covers insulation, clearances, creepage distances, overvoltage categories, protection against electric shock, thermal hazards and mechanical hazards. Mandatory for CE marking under the Low Voltage Directive.
IEC 61010-2-010 Safety requirements for ovens, furnaces, hot plates and heating baths used in laboratory and process applications.
IEC 61010-2-030 Additional requirements for equipment with testing or measuring circuits connected to live parts of other equipment — key for instruments with measurement inputs connected to power circuits.
IEC 61010-2-081 Covers automated laboratory analysers, sample preparation equipment and related instruments — relevant for online process analysers.
IEC 61010-2-201 Specific requirements for control equipment used in industrial automation, including PLCs and dedicated process controllers.
(CAT) (SELV/PELV) IEC 61010 is the safety standard for instrumentation and control equipment. While IEC 61326 (EMC for measurement equipment) governs electromagnetic performance, IEC 61010-1 governs electrical safety — protection of operators from shock, fire, and thermal hazards.
Any instrument, transmitter, analyser, recorder or controller placed on the EU market under the Low Voltage Directive (2014/35/EU) must comply with IEC 61010-1 (or an equivalent harmonised standard). It is the reference standard tested by certification bodies such as TÜV, UL, CSA and DEKRA.
| Category | Typical location | Examples |
|---|---|---|
| CAT I | Transient-protected circuits | Electronic measurement inputs, signal lines |
| CAT II | Single-phase appliances | Portable instruments, domestic equipment |
| CAT III | Distribution level | Panel meters in MCC, fixed installation meters |
| CAT IV | Origin of installation | Revenue meters, primary surge protection |
Key rule: always match the CAT rating of the instrument to the CAT rating of the measurement point. A CAT II instrument must never be used to measure at a CAT III point.
Most industrial instrument enclosures are rated Pollution Degree 2 (office/control room) or Pollution Degree 3 (industrial, outdoor). PD3 requires larger clearances and creepage, which directly affects PCB layout, connector selection, and enclosure sealing.