prEN IEC 62053-21:2026

• Status: Not Published
• Publication Date: 14-Nov-2027
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: CLC/TC 13 - Equipment for electrical energy measurement and load control
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 28-Aug-2026
• Completion Date: 28-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: oSIST 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: 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: 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

prEN IEC 62053-21:2026 is a CENELEC/IEC draft standard for static meters for AC active energy in accuracy classes 0,5, 1 and 2. It specifies type-test requirements for electricity metering equipment used on 50 Hz or 60 Hz networks up to 1 000 V, including the electrical ratings, accuracy checks, and influence tests that manufacturers and test laboratories need to verify a meter design.

What does prEN IEC 62053-21:2026 specify?

prEN IEC 62053-21:2026 applies to static watt-hour meters for AC active energy and to their type tests only. It is organized into Clauses 1 to 10, covering scope, references, terms, nominal electrical values, construction, marking, accuracy, climatic requirements, external influences, and type testing, plus Annex A for a graphical comparison of relative error limits.

The scope is focused on meters intended for indoor or outdoor use in revenue metering. It also covers meters with integrated or detached displays, meters without a display, and meters installed in a matching socket or rack.

The document excludes several other cases, including portable meters, meters used in rolling stock, vehicles, ships and airplanes, laboratory and meter test equipment, reference standard meters, data interfaces to the register, matching sockets or racks, and additional functions provided in electrical energy meters.

Meters designed for external transducers may be checked in two ways - as directly connected meters when the meter and transducers are tested together, or as transducer-operated meters when the meter is tested without transducers. That matters because the chosen test setup affects how the reference measurement is made and how the result is interpreted.

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

prEN IEC 62053-21:2026 sets the meter ratings, accuracy limits, and immunity tests that define whether a design is suitable for class 0,5, 1 or 2 service. It also says that, where this part conflicts with IEC 62052-11 or IEC 62052-31, the requirements in this part take precedence.

Electrical ratings and connection types

Clause 4 defines the nominal electrical values. Voltage, frequency and several current signals are tied to IEC 62052-11, while this part gives the class-specific starting, minimum, transitional and maximum current signals.

That matters in practice because the meter has to be rated and tested at the correct current points for its connection type. The document distinguishes directly connected, transformer-operated and transducer-operated meters, and the maximum current signal is not the same for all of them.

Construction, marking and documentation

Clauses 5 and 6 require the construction, marking and documentation rules from IEC 62052-11 to be applied. This means the meter has to be built and identified so that its rated conditions, connection mode and declared functions are clear to the user and the test laboratory.

Accuracy verification and basic meter tests

Clause 7.1 to 7.8 covers general test conditions, accuracy verification methods, measurement uncertainty, meter constant, initial start-up, no-load, starting current and repeatability tests. These are the basic laboratory checks used to show that the meter starts correctly, does not register when it should not, and gives repeatable results.

Clause 7.9 sets the limits of relative error at reference conditions. It also states that bidirectional meters must meet the limits in each direction, and that multi-connection-mode meters can only claim accuracy for the connection modes that were actually tested.

Influence quantities and environmental stress

Clause 7.10 limits the error shift caused by influence quantities such as electromagnetic fields, fast transients, harmonics, voltage variation, temperature, frequency variation, auxiliary supply changes, ripple on DC supply voltage, self-heating, fast load variations, earth fault and short-time overcurrents. The tests are performed at stated current and phase angle conditions, and some results are judged by comparing the meter error before and after the test.

This is important because a meter that is accurate at reference conditions can still drift when real supply conditions change. The clause also says that, for meters with multiple connection modes, the influence tests are performed in one selected mode that exercises the meter’s full metrological capability.

Climatic and type-test requirements

Clause 8 applies the climatic requirements from IEC 62052-11, Clause 9 applies the external influence requirements, and Clause 10 applies the type-test requirements. Together, these clauses define the environmental and verification framework that a design must pass before it can be accepted for class testing.

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

prEN IEC 62053-21:2026 uses the terms and definitions from IEC 62052-11, so the key meter terms are shared across the IEC 62053 series.

• Static meter - a meter that measures active energy by electronic means rather than by a moving-mechanism meter.
• AC active energy - active electrical energy measured on alternating-current networks, which is the billing quantity covered by this part.
• Starting current signal, I_st - the current point used to check when the meter begins to register energy.
• Minimum current signal, I_min - the lowest specified operating current used for accuracy testing.
• Transitional current signal, I_tr - the current point that separates the low-current and higher-current test regions.
• Maximum current signal, I_max - the upper current limit used for rating and test purposes.
• Reference conditions - the defined test conditions used as the baseline for accuracy and influence testing.

Who uses prEN IEC 62053-21:2026?

prEN IEC 62053-21:2026 is used by meter manufacturers, test laboratories, certification bodies, utilities and purchasers that specify revenue meters. In practice, they use it for design verification, type testing, procurement checks and conformity assessment of AC active energy meters.

The foreword also notes that manufacturers and testing organizations may need a transition period after publication to update products and test setups.

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

prEN IEC 62053-21:2026 cancels and replaces the second edition published in 2020. The foreword lists these technical changes:

• Normative references have been updated.
• Transducer-operated meters are included in scope when tested without transducers.
• Transitional current has been introduced.
• Starting current, minimum current and maximum current are expressed as fractions of transitional current.
• A ripple on DC supply voltage test has been added.
• The figures in Annex A have been revised.

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

The document is intended to be used with IEC 62052-11 and IEC 62052-31, and the introduction also names several companion parts from the IEC metering and test series.

Standard	What it contributes
IEC 62052-11 edition 3 CDV:2026	General requirements, test conditions, terms, nominal values and many shared test methods
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 edition 3 CDV:2026	Requirements for static meters for AC active energy in classes 0,1 S, 0,2 S and 0,5 S
IEC 62053-24 edition 3 CDV:2026	Requirements for static meters for fundamental component reactive energy
IEC 62055-31:2022	Particular requirements for static payment meters for active energy
IEC 62057-1:2023	Stationary meter test units
IEC 62057-3:2024	Automatic meter testing systems
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	Stability testing of metrological characteristics by elevated temperature

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

The document contains tables for current signals, reference-condition error limits, and error shifts due to influence quantities. It also includes Annex A figures that compare relative error limits for classes 0,5, 1 and 2 at selected currents and power factors for direct connection.

Clause 7 is the main test section, so the document is used most directly for type testing, laboratory verification and comparison against declared accuracy classes. The bibliography section is present but contains no bibliographic references.

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:
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IEC CDV 62053-21 © IEC 2026
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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
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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
...