Overview
IEC 62052-21:2004 - Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 21: Tariff and load control equipment - defines the general type-test requirements for newly manufactured indoor tariff and load control devices. This includes electronic ripple control receivers, time switches, multi‑tariff registers and maximum demand indicator devices or when tariff/load control functions are integrated into multifunction meters. A bilingual edition (2016-07) corresponds to the original 2004 publication.
Key topics and technical requirements
The standard sets out mandatory test categories and technical subjects to verify safe, reliable operation of tariff and load control equipment:
- Scope and definitions - clear terminology for ripple-control, time switches, output and mechanical elements.
- Mechanical requirements and tests - enclosure, windows, terminals, creepage and clearance, marking, protection against dust/water and fire resistance; separation for protective class I and II equipment.
- Climatic tests - temperature range, relative humidity and environmental influence tests (see Annex A/B).
- Electrical tests - supply voltage ranges, heating, insulation, rated breaking voltages/currents, output element verification and functional testing.
- Electromagnetic compatibility (EMC) and radio interference - immunity and emission requirements and test set-ups (Annex D).
- Test conditions and type test procedures - type test schedules, examples of acceptance tests (informative Annex F) and dependability considerations referenced to IEC 62059 series.
- Normative and informative annexes - reference values for influence quantities, electromagnet for magnetic-field testing, EMC arrangements and test schedules.
Applications and users
IEC 62052-21 is primarily intended for:
- Manufacturers of tariff/load control devices and multifunction electricity meters - to design and verify compliance during type testing.
- Test laboratories and certification bodies - to run standardized mechanical, climatic, electrical and EMC tests.
- Utilities and system integrators - to specify equipment acceptance criteria for load‑control and multi‑tariff billing deployments.
- Design and compliance engineers - for product development, risk mitigation and regulatory conformity.
Practical benefits include improved reliability, safety, interoperability in demand-response and tariff-management systems, and reduced field failures.
Related standards
- IEC 62054-11 - particular requirements for electronic ripple control receivers
- IEC 62054-21 - particular requirements for time switches
- IEC 62059 series - dependability (reliability and field data)
These documents should be used together with IEC 62052-21 when specifying, testing or certifying tariff and load control equipment.
Keywords: IEC 62052-21, tariff and load control equipment, electricity metering, electronic ripple control receivers, time switches, type test, EMC, multi-tariff registers.