EN IEC 62053-21:2021

Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)

IEC 62053-21:2020 applies only to static watt-hour meters of accuracy classes 0,5, 1 and 2 for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests only. This document applies to electricity metering equipment designed to: • measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC; • have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays; • operate with integrated or detached indicating displays, or without an indicating display; • be installed in a specified matching socket or rack; • optionally, provide additional functions other than those for measurement of electrical energy. Meters designed for operation with low power instrument transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document only if such meters and their LPITs are tested together and meet the requirements for directly connected meters. This document does not apply to: • meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC; • meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series) when tested without such transformers; • metering systems comprising multiple devices (except LPITs) physically remote from one another; • portable meters; • meters used in rolling stock, vehicles, ships and airplanes; • laboratory and meter test equipment; • reference standard meters; • data interfaces to the register of the meter; • matching sockets or racks used for installation of electricity metering equipment; • any additional functions provided in electrical energy meters. This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering). This second edition cancels and replaces the first edition published in 2003 and its amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31: 2015. b) Replaced Ib with In; Ib is no longer used when referencing directly connected meters. c) Moved the descriptions of all general requirements and test methods from IEC 62053-21: 2003, IEC 62053-22: 2003, IEC 62053-23: 2003, IEC 62053-24: 2003 to IEC 62052-11:2020; IEC 62053-21:2020, IEC 62053-22:2020, IEC 62053-23:2020, IEC 62053-24:2020 contain only accuracy class specific requirements. d) Added new requirements and tests concerning: 1) measurement uncertainty and repeatability (7.3, 7.8); 2) influence of fast load current variations (9.4.12); 3) immunity to conducted differential current disturbances in the 2 kHz to 150 kHz frequency range (9.3.8). e) Meters designed for operation with low power instrument transformers (LPITs) may be tested for compliance with this document as directly connected meters.

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)

IEC 62053-21:2020 est applicable uniquement aux compteurs statiques d'énergie active des classes de précision 0,5, 1 et 2, destinés à la mesure de l'énergie électrique active en courant alternatif sur les réseaux électriques en 50 Hz et 60 Hz, et à leurs essais de type. Le présent document s'applique aux équipements de comptage de l'électricité conçus pour: • mesurer et piloter l'énergie électrique sur les réseaux électriques (secteur) avec une tension allant jusqu'à 1 000 V; • avoir tous les éléments fonctionnels, y compris les modules complémentaires, incorporés dans ou formant un boîtier de compteur unique, à l'exception des afficheurs; • fonctionner avec des afficheurs intégrés ou séparés, ou sans afficheur; • être installés dans une embase ou un bâti correspondant spécifié; • assurer, en option, des fonctions autres que celles relatives au comptage de l'énergie électrique. Les compteurs conçus pour être utilisés avec des transformateurs de mesure de faible puissance (LPIT, Low Power Instrument Transformers, définis dans la série IEC 61869) ne peuvent être soumis à des essais de conformité au présent document que si ces compteurs et leurs LPIT sont soumis à l'essai ensemble et satisfont aux exigences relatives aux compteurs à branchement direct. Le présent document ne s'applique pas: • aux compteurs dont la tension phase-neutre déduite des tensions nominales dépasse 1 000 V; • aux compteurs destinés à être connectés à des transformateurs de mesure de faible puissance (LPIT, définis dans la série IEC 61869) lorsqu'ils sont soumis à l'essai sans ces transformateurs; • aux systèmes de comptage comprenant plusieurs dispositifs (à l'exception des LPIT) physiquement éloignés les uns des autres; • aux compteurs portatifs; • aux compteurs utilisés dans le matériel roulant, les véhicules, les navires et les avions; • aux équipements de laboratoire et d'essai des compteurs; • aux compteurs étalons de référence; • aux interfaces de données avec l'élément indicateur du compteur; • aux embases ou bâtis correspondants utilisés pour l'installation des équipements de comptage de l'électricité; • à toute fonction complémentaire assurée par les compteurs d'énergie électrique. Le présent document ne couvre pas les mesures de détection et de prévention des tentatives frauduleuses de compromettre les performances du compteur (falsification). Cette deuxième édition annule et remplace la première édition parue en 2003 et son amendement 1:2016. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: voir Annexe B.

Oprema za merjenje električne energije - Posebne zahteve - 21. del: Statični števci delovne energije (razreda 0,5, 1 in 2)

General Information

• Status: Published
• Publication Date: 01-Apr-2021
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: CLC/TC 13 - Equipment for electrical energy measurement and load control
• Drafting Committee: IEC/TC 13 - IEC_TC_13
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 02-Apr-2021
• Completion Date: 02-Apr-2021
• 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/404 - Standardisation Mandate to CEN, CENELEC and ETSI for harmonized standard according to the Electro Magnetic Compatibility (EMC) Directive 2004/108/EC
• 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: 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)

Relations

• Replaces: EN 62053-21:2003 - Electricity metering equipment (a.c.) - Particular requirements - Part 21: Static meters for active energy (classes 1 and 2)
• Effective Date: 26-Jan-2023
• Replaces: EN 62053-21:2003/A1:2017/AC:2018-05 - Electricity metering equipment (a.c.) - Particular requirements - Part 21: Static meters for active energy (classes 1 and 2)
• Effective Date: 03-Apr-2018
• Replaces: EN 62053-21:2003/A1:2017 - Electricity metering equipment (a.c.) - Particular requirements - Part 21: Static meters for active energy (classes 1 and 2)
• Effective Date: 18-Oct-2016
• Amended By: 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: 16-Feb-2021

Overview

EN IEC 62053-21:2021 (CLC adoption of IEC 62053-21:2020) specifies particular requirements for static electricity meters that measure AC active energy in 50 Hz or 60 Hz networks. It applies to type tests only for directly connected meters of accuracy classes 0,5, 1 and 2, designed for operation on networks up to 1 000 V AC. The standard covers meters with integrated or detached displays (or no display), meters installed in matching sockets/racks, and meters that may include additional non-measurement functions. It excludes safety requirements (now in IEC 62052-31), portable meters, meters for vehicles/ships/aircraft, metering systems with remote devices, data interfaces to the register, tampering-detection measures, and other listed exceptions.

Key Topics and Requirements

• Scope and applicability: Directly connected static watt‑hour meters; testing of meters designed to operate with LPITs only when tested together with their LPITs.
• Accuracy classes: Requirements specific to classes 0,5, 1, and 2 (error limits and influence quantities).
• Type tests: Defines the type testing regime for accuracy and performance at reference conditions.
• Accuracy and metrology:
  • Measurement uncertainty and repeatability (new or clarified requirements).
  • Limits of error across current, voltage, and power factor ranges.
  • Starting current, minimum current, and behaviour under fast load current variations.
• Influence and immunity:
  • Tests for influence quantities and immunity to conducted differential current disturbances in the 2 kHz–150 kHz band.
• Construction, marking and documentation: Requirements for meter identification, documentation and envelope of functional elements (add‑ons must be enclosed or form part of the single meter case).
• Climatic and external influences: Environmental test conditions and durability considerations.
• Time‑keeping accuracy and other functional verification tests.
• Note: Meter safety requirements have been removed from this edition and referenced to IEC 62052-31.

Practical Applications and Users

EN IEC 62053-21 is primarily used by:

• Meter manufacturers for design verification and type-certification of static AC active energy meters.
• Test laboratories and certification bodies performing type tests and conformity assessments.
• Utilities and metering procurement teams to specify compliant meters for billing-grade installations.
• Regulators and standards committees referencing accuracy, immunity and testing criteria.
• Metrology and R&D teams when validating meter performance, including combined testing with LPITs.

Typical applications include billing meters in residential, commercial and industrial networks, and type testing of meters destined for national markets or for compliance with European/CENELEC requirements.

Related Standards

• IEC/EN 62052-11:2020 / EN IEC 62052-11:2021 - General metering equipment requirements, tests and test conditions
• IEC 62052-31 / EN IEC 62052-31 - Meter product safety (moved from this edition)
• IEC 62053-22/23/24 - Other static/electromechanical meter parts in the 62053 series
• IEC 61869 series - Low Power Instrument Transformers (LPITs), when meters are tested with LPITs

Keywords: EN IEC 62053-21, electricity metering, static meters, AC active energy, accuracy classes 0.5 1 2, type tests, meter testing, LPITs, IEC 62052-11.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN 62053-21:2004
SIST EN 62053-21:2004//A1:2017
SIST EN 62053-21:2004/A1:2017/AC:2018
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)
Ta slovenski standard je istoveten z: EN IEC 62053-21:2021
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.

EUROPEAN STANDARD EN IEC 62053-21

NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 17.220.20 Supersedes EN 62053-21:2003 and all of its
amendments and corrigenda (if any)
English Version
Electricity metering equipment - Particular requirements –
Part 21: Static meters for AC active energy
(classes 0,5, 1 and 2)
(IEC 62053-21:2020)
Équipement de comptage de l'électricité - Exigences Elektrizitätszähler - Besondere Anforderungen - Teil 21:
particulières - Partie 21: Compteurs statiques d'énergie Elektronische Wirkverbrauchszähler für Wechselstrom der
active en courant alternatif (classes 0,5, 1 et 2) Genauigkeitsklassen 0,5, 1 und 2
(IEC 62053-21:2020) (IEC 62053-21:2020)
This European Standard was approved by CENELEC on 2020-07-22. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62053-21:2021 E

European foreword
The text of document 13/1805A/FDIS, future edition 2 of IEC 62053-21, prepared by IEC/TC 13
"Electrical energy measurement and control" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 62053-21:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-04-02
document have to be withdrawn
This document supersedes EN 62053-21:2003 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 62053-21:2020 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 62052-11 2020 Electricity metering equipment - General EN IEC 62052-11 2021
requirements, tests and test conditions -
Part 11: Metering equipment
IEC 62053-21 ®
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – Particular requirements –

Part 21: Static meters for AC active energy (classes 0,5, 1 and 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)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-8438-4

– 2 – IEC 62053-21:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Standard electrical values. 9
4.1 Voltages . 9
4.2 Currents . 10
4.2.1 Nominal currents . 10
4.2.2 Starting current . 10
4.2.3 Minimum current . 10
4.2.4 Maximum current . 10
4.3 Frequencies . 10
4.4 Power consumption . 10
5 Construction requirements . 10
6 Meter marking and documentation . 10
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 . 11
7.8 Repeatability test . 11
7.9 Limits of error due to variation of the current . 11
7.10 Limits of error due to influence quantities . 12
7.11 Time-keeping accuracy . 14
8 Climatic requirements . 14
9 The effects of external influences . 15
10 Type test . 15
Annex A (informative) Comparison of acceptable percentage error limits at reference
conditions for meters of classes 0,5, 1, and 2 . 16
Annex B (informative) Summary of changes . 17

Figure A.1 – Comparison of acceptable percentage error limits for meters of classes
0,5, 1 and 2, with I = 5 A and I = 10 A, at PF = 1,0, for direct connection . 16
n max
Figure A.2 – Comparison of acceptable percentage error limits for meters of classes
0,5, 1 and 2, with I = 5 A and I = 10 A, at PF = 0,5 inductive, for direct connection . 16
n max
Table 1 – Starting current . 10
Table 2 – Minimum current. 10
Table 3 – Acceptable percentage error limits (single-phase meters and poly-phase
meters with balanced loads or single-phase loads) . 12

IEC 62053-21:2020 © IEC 2020 – 3 –
Table 4 – Acceptable limits of variation in percentage error due to influence quantities . 13

– 4 – IEC 62053-21:2020 © IEC 2020
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 corresponding 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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62053-21 has been prepared by IEC technical committee 13:
Electrical energy measurement and control.
This second edition cancels and replaces the first edition published in 2003 and its
amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition: see Annex B.
The text of this International Standard is based on the following documents:
FDIS Report on voting
13/1805A/FDIS 13/1813/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.

IEC 62053-21:2020 © IEC 2020 – 5 –
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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
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.

– 6 – IEC 62053-21:2020 © IEC 2020
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, and with the IEC 62055 series, Electricity
metering – Payment systems:
IEC 62052‑11:2020, Electricity metering equipment – General requirements, tests
and test conditions – Part 11: Metering equipment
IEC 62052‑31:2015, Electricity metering equipment (AC) – General requirements,
tests and test conditions – Part 31: Product safety
requirements and tests
IEC 62053‑11:2003, Electricity metering equipment (AC) – Particular requirements
– Part 11: Electromechanical meters for active energy
(classes 0,5, 1 and 2)
IEC 62053‑22:2020, 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 62053‑23:2020, Electricity metering equipment – Particular requirements –
Part 23: Static meters for reactive energy (classes 2 and 3)
IEC 62053‑24:2020, Electricity metering equipment – Particular requirements –
Part 24: Static meters for fundamental component reactive
energy (classes 0,5 S, 1S, 1, 2 and 3)
IEC 62053‑41: –, Electricity metering equipment– Particular requirements –
Part 41: Static meters for direct current energy (classes 0,5
and 1)
IEC 62055‑31:2005, Electricity metering – Payment systems – Part 31: Particular
requirements – Static payment meters for active energy
(classes 1 and 2)
IEC 62057‑1: – Test equipment, techniques and procedures for electrical
energy meters – Part 1: Stationary Meter Test Units (MTU)
IEC 62058‑11:2008, Electricity metering equipment (AC) – Acceptance inspection -
–Part 11: General acceptance inspection methods
IEC 62058‑21:2008, Electricity metering equipment (AC) – Acceptance inspection
– Part 21: Particular requirements for electromechanical
meters for active energy (classes 0,5, 1 and 2)
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 62059‑11:2002, Electricity metering equipment – Dependability – Part 11:
General concepts
IEC 62059‑21:2002, Electricity metering equipment – Dependability – Part 21:
...