oSIST prEN IEC 62053-21:2026

• Status: Not Published
• Public Enquiry End Date: 30-Jul-2026
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: MEE - Equipment for electrical energy measurement and load control
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 11-Jun-2026
• Due Date: 29-Oct-2026
• Completion Date: 03-Aug-2026
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: prEN IEC 62053-21:2026 - Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)

• Revises: SIST EN IEC 62053-21:2021 - Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
• Effective Date: 08-Apr-2025
• Revises: SIST EN IEC 62053-21:2021/A11:2021 - Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
• Effective Date: 08-Apr-2025

oSIST prEN IEC 62053-21:2026 is the SIST standard for static meters that measure alternating current active energy. It covers accuracy classes 0,5, 1 and 2 for 50 Hz or 60 Hz networks, and it is written for type testing meters used up to 1 000 V. The standard builds on IEC 62052-11 for general meter requirements, test conditions and shared definitions.

What does oSIST prEN IEC 62053-21:2026 specify?

oSIST prEN IEC 62053-21:2026 specifies the particular requirements for static watt-hour meters used to measure AC active energy. It focuses on how these meters are rated, tested and judged for classes 0,5, 1 and 2.

The standard applies to meters with all functional elements in one case, with integrated or separate indicating displays, installed in a matching socket or rack, and with optional additional functions. It also covers meters designed for external transducers, either tested with the transducers as directly connected meters or tested without the transducers as transducer-operated meters.

It is organized into clauses 1 to 10, followed by informative Annex A.

Annex	What it covers
Annex A	Comparison of relative error limits at reference conditions for meters of classes 0,5, 1 and 2

The scope excludes portable meters, meters for rolling stock, vehicles, ships and airplanes, laboratory and meter test equipment, reference standard meters, remote multiple-device metering systems, matching sockets or racks, data interfaces to the register, and additional functions outside energy metering.

What are the key requirements of oSIST prEN IEC 62053-21:2026?

oSIST prEN IEC 62053-21:2026 sets the electrical ratings, accuracy limits and test methods that laboratories use to verify compliance. In practice, it tells manufacturers what operating range a meter must cover and tells test labs which conditions and limits to apply.

Electrical values and meter ratings

Clause 4 uses the nominal voltages, nominal currents, frequencies and power consumption requirements from IEC 62052-11, while also defining current signals specific to this part. Tables 1 to 4 distinguish starting, minimum, transitional and maximum current signals for directly connected, transformer-operated and transducer-operated meters.

That matters because the meter must start, measure and stay accurate across the full current range expected for its connection type. The transitional current is the key boundary used in this edition, and the start, minimum and maximum current signals are expressed in relation to it.

Construction, marking and documentation

Clauses 5 and 6 rely on the general construction, marking and documentation requirements from IEC 62052-11. For users, that means the meter design, nameplate information and accompanying documentation must align with the shared metering framework, not only with the accuracy rules in this part.

Accuracy at reference conditions

Clause 7.9 sets the limits of relative error at reference conditions. Table 5 gives the permitted error limits by meter class, current range and phase angle for single-phase meters and poly-phase meters with balanced loads or single-phase loads.

For meters that measure energy in both directions, the limits apply to each direction. For meters with multiple connection modes, the tested accuracy claims apply only to the connection modes actually tested.

Influence quantities and environmental effects

Clause 7.10 sets the limits for error shift due to influence quantities, using Table 6. The table covers electromagnetic disturbance, fast transients, conducted disturbances, magnetic fields, harmonics, voltage variation, temperature variation, phase interruption, frequency variation, reversed phase sequence, auxiliary supply variation, ripple on DC supply voltage, auxiliary devices, short-time overcurrents, self-heating, fast load variations, earth fault, dry heat, cold and damp heat.

This is the part that tells a manufacturer and a test lab which external conditions must be checked and how much the meter is allowed to drift. If a meter has multiple connection modes, the influence tests are performed in one mode that exercises the meter’s full metrological capability.

General test conditions and type testing

Clauses 7.1 to 7.8 take the general test conditions, accuracy verification methods, uncertainty estimation, meter constant, initial start-up, no-load test, starting current test and repeatability test from IEC 62052-11. Clause 7.11 also uses the time-keeping accuracy requirements from IEC 62052-11.

Clause 8 applies the climatic requirements from IEC 62052-11, clause 9 applies the external influence requirements from IEC 62052-11, and clause 10 applies the type test requirements from IEC 62052-11. For a user, this means the part is built around type testing rather than routine production inspection.

What terms does oSIST prEN IEC 62053-21:2026 define?

oSIST prEN IEC 62053-21:2026 uses the terms and definitions from IEC 62052-11, but several terms are central to understanding the requirements.

• Starting current signal - the current level used to check that the meter begins registering energy.
• Minimum current signal - the lower operating current used in accuracy and operating-range checks.
• Transitional current signal - the current boundary that separates the lower and upper accuracy regions.
• Maximum current signal - the upper current level used to define the meter’s operating limit.
• Relative error - the difference between the meter result and the reference result, expressed as a percentage.
• Influence quantity - an external condition such as temperature, electromagnetic field, frequency change or auxiliary supply variation that can shift meter accuracy.
• Current transformer (CT) - a transformer used with transformer-operated meters; the note in this part links CT measuring ranges to the meter classes.

Who uses oSIST prEN IEC 62053-21:2026?

oSIST prEN IEC 62053-21:2026 is used by meter manufacturers, test laboratories, certification bodies, utilities and buyers who specify static AC active energy meters. Manufacturers use it to design the meter and choose the rated current range. Test laboratories use it to run type tests and calculate compliance against the permitted error limits. Buyers and quality managers use it when selecting meters for billing, metering systems or procurement specifications.

What changed in oSIST prEN IEC 62053-21:2026 from the previous edition?

oSIST prEN IEC 62053-21:2026 cancels and replaces the second edition published in 2020. The document states that this edition is a technical revision.

The stated changes are:

• normative references were updated
• transducer-operated meters were included in the scope and are tested without transducers
• the transitional current was introduced
• the starting current, minimum current and maximum current were expressed as fractions of the transitional current
• the ripple on DC supply voltage test was introduced
• the figures in Annex A were revised

Which standards are used with oSIST prEN IEC 62053-21:2026?

oSIST prEN IEC 62053-21:2026 cites IEC 62052-11 as its normative reference. The introduction also names companion standards that are intended to be used with this part.

Standard	What it contributes
IEC 62052-11	General meter requirements, tests, test conditions, definitions and many shared requirements used throughout this part
IEC 62052-31:2024	Product safety requirements and tests
IEC 62052-41:2022	Energy registration methods and requirements for multi-energy and multi-rate meters
IEC 62053-22	Static meters for AC active energy classes 0,1 S, 0,2 S and 0,5 S
IEC 62053-24	Static meters for fundamental component reactive energy
IEC 62055-31:2022	Static payment meters for active energy classes 1 and 2
IEC 62057-1:2023	Stationary meter test units (MTUs)
IEC 62057-3:2024	Automatic meter testing system (AMTS)
IEC 62058-11:2008	General acceptance inspection methods
IEC 62058-31:2008	Acceptance inspection for static meters for active energy
IEC TR 62059-11:2002	General dependability concepts
IEC TR 62059-21:2002	Collection of meter dependability data from the field
IEC 62059-32-1:2011	Durability testing by elevated temperature

What does the oSIST prEN IEC 62053-21:2026 document contain?

The document contains the foreword, introduction, clauses 1 to 10, one informative annex, a bibliography section and the tables and figures needed for testing and comparison. The body of the standard provides the current signals, the error limits at reference conditions, and the error-shift limits for influence quantities.

Tables 1 to 4 define the current-signal points used for starting, minimum, transitional and maximum current. Table 5 gives the relative error limits at reference conditions, and Table 6 gives the allowed error shift under influence quantities. Annex A adds two comparison figures for classes 0,5, 1 and 2 at direct connection.

SLOVENSKI STANDARD
01-julij-2026
Oprema za merjenje električne energije - Posebne zahteve - 21. del: Statični števci
delovne energije (razreda 0,5, 1 in 2)
Electricity metering equipment - Particular requirements - Part 21: Static meters for AC
active energy (classes 0,5, 1 and 2)
Elektrizitätszähler - Besondere Anforderungen - Teil 21: Elektronische
Wirkverbrauchszähler für Wechselstrom der Genauigkeitsklassen 0,5, 1 und 2
équipement de comptage de l'électricité - Exigences particulières - Partie 21: Compteurs
statiques d'énergie active en courant alternatif (classes 0,5, 1 et 2)
Ta slovenski standard je istoveten z: prEN IEC 62053-21:2026
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

13/2001/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62053-21 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-06-05 2026-08-28
SUPERSEDES DOCUMENTS:
13/1948/CD, 13/1995/CC
IEC TC 13 : ELECTRICAL ENERGY MEASUREMENT AND CONTROL
SECRETARIAT: SECRETARY:
Hungary Mr Bela Bodi
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 85,ACEC
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active
energy (classes 0,5, 1 and 2)
PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

IEC CDV 62053-21 © IEC 2026
Link to Committee Draft for Vote (CDV) online document:
Click here
How to access
This link leads you to the Online Standards Development (OSD) platform for National Mirror
Committee’s (NMC) comments. The project draft may be found further down this document.

Resource materials
We recommend NCs to review the available materials to better understand the member commenting
on the OSD platform. This includes the:
• OSD NC roles overview
• How to add and submit comments to the IEC

Contact
Should you require any assistance, please contact the IEC IT Helpdesk.

IEC CDV 62053-21 © IEC 2026
CONTENTS
CONTENTS . 1
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Nominal electrical values . 10
4.1 Voltages . 10
4.2 Currents . 10
4.2.1 Nominal current signal . 10
4.2.2 Starting current signal . 10
4.2.3 Minimum current signal . 10
4.2.4 Transitional current signal . 10
4.2.5 Maximum current signal . 10
4.3 Frequencies . 11
4.4 Power consumption. 11
5 Construction requirements . 11
6 Meter marking and documentation . 11
7 Accuracy requirements . 11
7.1 General test conditions . 11
7.2 Methods of accuracy verification . 11
7.3 Measurement uncertainty . 11
7.4 Meter constant . 11
7.5 Initial start-up of the meter . 11
7.6 Test of no-load condition . 11
7.7 Starting current test . 12
7.8 Repeatability test . 12
7.9 Limits of error due to variation of the current signal . 12
7.10 Limits of error shift due to influence quantities . 13
7.11 Time-keeping accuracy . 15
8 Climatic requirements . 15
9 The effects of external influences . 15
10 Type test . 15
Annex A (informative) Comparison of relative error limits at reference conditions for
meters of classes 0,5, 1 and 2 . 16
Bibliography . 17

Figure A.1 – Comparison of relative error limits for meters of classes 0,5, 1 and 2, with
I = 10 A and I = 20 A, at power factor = 1,0, for direct connection . 16
n max
Figure A.2 – Comparison of relative error limits for meters of classes 0,5, 1 and 2, with
I = 10 A and I = 20 A, at power factor = 0,5 inductive, for direct connection . 16
n max
Table 1 – Starting current signal . 10
Table 2 – Minimum current signal . 10
Table 3 – Transitional current signal . 10
IEC CDV 62053-21 © IEC 2026
Table 4 – Maximum current signal . 11
Table 5 – Limits of relative error at reference conditions (single-phase meters and
poly-phase meters with balanced loads or single-phase loads) . 12
Table 6 – Limits of relative error shift due to influence quantities . 13

IEC CDV 62053-21 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electricity metering equipment - Particular requirements -
Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
standardization comprising all national electrotechnical committees (IEC National Committees).
The object of IEC is to promote international co-operation on all questions concerning
standardization in the electrical and electronic fields. To this end and in addition to other
activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National
Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as
possible, an international consensus of opinion on the relevant subjects since each technical
committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted
by IEC National Committees in that sense. While all reasonable efforts are made to ensure that
the technical content of IEC Publications is accurate, IEC cannot be held responsible for the
way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC
Publications transparently to the maximum extent possible in their national and regional
publications. Any divergence between any IEC Publication and the corres ponding national or
regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies
provide conformity assessment services and, in some areas, access to IEC marks of conformity.
IEC is not responsible for any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including
individual experts and members of its technical committees and IEC National Committees for
any personal injury, property damage or other damage of any nature whatsoever, whether direct
or indirect, or for costs (including legal fees) and expenses arising out of the publication, use
of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
publications is indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC had not notice of (a) patent(s), which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which
IEC CDV 62053-21 © IEC 2026
may be obtained from the patent database available at https://patents.iec.ch and 9) IEC draws
attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, IEC had not
notice of (a) patent(s), which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at https://patents.iec.ch and www.iso.org/patents .
IEC shall not be held responsible for identifying any or all such patent rights. . IEC shall not be
held responsible for identifying any or all such patent rights.
IEC 62053-21 has been prepared by IEC technical committee 13: Electrical energy
measurement and control. It is an International Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Normative references have been updated;
b) Transducer-operated meters included in scope (tested without transducers);
c) The transitional current has been introduced;
d) The starting current, minimum current and maximum current have been expressed as
fractions of the transitional current;
e) The test "Ripple on DC supply voltage" has been introduced;
f) Figures in Annex A have been revised.
The text of this International Standard is based on the following documents:
Draft Report on voting
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English [change
language if necessary].
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 62053 series, published under the general title Electricity metering
equipment – Particular requirements, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
IEC CDV 62053-21 © IEC 2026
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 2 years from the date of publication.
IEC CDV 62053-21 © IEC 2026
INTRODUCTION
This part of IEC 62053 is to be used with relevant parts of the IEC 62052, IEC 62058 and
IEC 62059 series, Electricity metering equipment, with the IEC 62055 series, Electricity
metering – Payment systems and with the IEC 62057 series, Electrical energy meters:
IEC 62052-11 edition 3 CDV:2026 , Electricity metering equipment – General requirements,
tests and test conditions – Part 11: Metering equipment
IEC 62052-31:2024, Electricity metering equipment – General requirements, tests and test
conditions – Part 31: Product safety requirements and tests
IEC 62052-41:2022, Electricity metering equipment – General requirements, tests and test
conditions – Part 41: Energy registration methods and requirements for multi-energy and multi-
rate meters
IEC 62053-22 edition 3 CDV :2026, Electricity metering equipment – Particular requirements –
Part 22: Static meters for AC active energy (classes 0,1 S, 0,2 S and 0,5 S)
IEC 62053-24 edition 3 CDV :2026, Electricity metering equipment – Particular requirements –
Part 24: Static meters for fundamental component reactive energy (classes 0,5 S, 1 S, 1, 2 and
3)
IEC 62055-31:2022, Electricity metering – Payment systems – Part 31: Particular requirements
– Static payment meters for active energy (classes 1 and 2)
IEC 62057-1:2023, Electrical energy meters – Test equipment, techniques and procedures –
Part 1: Stationary meter test units (MTUs)
IEC 62057-3:2024, Electrical energy meters – Test equipment, techniques and procedures –
Part 3: Automatic meter testing system (AMTS)
IEC 62058-11:2008, Electricity metering equipment (AC) – Acceptance inspection – Part 11:
General acceptance inspection methods
IEC 62058-31:2008, Electricity metering equipment (AC) – Acceptance inspection – Part 31:
Particular requirements for static meters for active energy (classes 0,2 S, 0,5 S, 1 and 2)
IEC TR 62059-11:2002, Electricity metering equipment – Dependability – Part 11: General
concepts
IEC TR 62059-21:2002, Electricity metering equipment – Dependability – Part 21: Collection of
meter dependability data from the field
IEC 62059-32-1:2011, Electricity metering equipment – Dependability – Part 32-1: Durability –
Testing of the stability of metrological characteristics by applying elevated temperature
This part is a standard for type testing electricity meters. It covers the particular requirements
for meters, being used indoors and outdoors in large quantities worldwide. It does not deal with
special implementations (such as metering-part and/or displays in separate housings).
This document is intended to be used in conjunction with IEC 62052-11 edition 3 CDV :2026
and with IEC 62052-31:2024. When any requirement in this document concerns an item already
covered in IEC 62052-11 edition 3 CDV :2026 or in IEC 62052-31:2024, the requirements of
this document take precedence over the requirements of IEC 62052-11 edition 3 CDV :2026 or
of IEC 62052‑31:2024.
IEC CDV 62053-21 © IEC 2026
The specifications and test levels in this document are regarded as minimum values for the
proper functioning of electricity measurement and load control equipment under normal working
conditions. For special applications, additional or ext
...