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 62052-41:2022 applies only to newly manufactured multi-energy and/or multi-rate static meters and it applies to their type tests only.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on networks with voltage up to 1 000 V AC, or 1 500 V DC;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
• operate with integrated displays;
• operate with 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 and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as 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, or 1 500 V DC;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers;
• metering systems comprising multiple devices (except for 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.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering).

Équipement de comptage de l’électricité - Exigences générales, essais et conditions d’essai - Partie 41: Méthodes d’enregistrement de l’énergie et exigences relatives aux compteurs à tarifs multiples et aux compteurs à énergies multiples

IEC 62052-41:2022 s’applique uniquement aux compteurs statiques à tarifs multiples et/ou à énergies multiples nouvellement fabriqués ainsi qu’à leurs essais de type.
Le présent document s’applique aux équipements de comptage de l’électricité conçus pour:
• le comptage et le pilotage de l’énergie électrique sur les réseaux électriques de tension jusqu’à 1 000 V en courant alternatif ou 1 500 V en courant continu;
• 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;
• fonctionner avec des afficheurs séparés, ou sans afficheur;
• être installés dans une embase ou un rack correspondant spécifié;
• de façon facultative, assurer des fonctions autres que celles relatives au comptage de l’énergie électrique.
Les compteurs conçus pour fonctionner avec des transformateurs de mesure de faible puissance (LPIT tels que définis dans la série IEC 61869) ne peuvent être soumis à des essais de conformité au présent document et aux documents pertinents de la série IEC 62053 uniquement que si ces compteurs et leurs LPIT sont soumis à l’essai ensemble en tant que 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 en courant alternatif ou 1 500 V en courant continu;
• aux compteurs destinés à être connectés à des transformateurs de mesure de faible puissance (LPIT, définis dans la série de normes IEC 61869) lorsqu’ils sont soumis à l’essai sans ces transformateurs;
• aux systèmes de comptage comprenant plusieurs appareils (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 le registre du compteur;
• aux embases ou aux racks correspondants utilisés pour l’installation des équipements de comptage de l’électricité.
Le présent document ne couvre pas les mesures de détection et de prévention des tentatives de fraude visant à compromettre les performances du compteur (falsification).

General Information

• Status: Published
• Publication Date: 27-Oct-2022
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: TC 13 - Electrical energy measurement and control
• Drafting Committee: WG 11 - TC 13/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 28-Oct-2022
• Completion Date: 04-Nov-2022

Standards Content (Sample)

IEC 62052-41 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – General requirements, tests and test
conditions –
Part 41: Energy registration methods and requirements for multi-energy and
multi-rate meters
Équipement de comptage de l’électricité – Exigences générales, essais et
conditions d’essai –
Partie 41: Méthodes d’enregistrement de l’énergie et exigences relatives aux
compteurs à tarifs multiples et aux compteurs à énergies multiples

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Découvrez notre puissant moteur de recherche et consultez
webstore.iec.ch/advsearchform gratuitement tous les aperçus des publications. Avec un
La recherche avancée permet de trouver des publications IEC abonnement, vous aurez toujours accès à un contenu à jour
en utilisant différents critères (numéro de référence, texte, adapté à vos besoins.
comité d’études, …). Elle donne aussi des informations sur les
projets et les publications remplacées ou retirées. Electropedia - www.electropedia.org

Le premier dictionnaire d'électrotechnologie en ligne au monde,
IEC Just Published - webstore.iec.ch/justpublished
avec plus de 22 300 articles terminologiques en anglais et en
Restez informé sur les nouvelles publications IEC. Just
français, ainsi que les termes équivalents dans 19 langues
Published détaille les nouvelles publications parues.
additionnelles. Egalement appelé Vocabulaire
Disponible en ligne et une fois par mois par email.
Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC Products & Services Portal - products.iec.ch

IEC 62052-41 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – General requirements, tests and test

conditions –
Part 41: Energy registration methods and requirements for multi-energy and

multi-rate meters
Équipement de comptage de l’électricité – Exigences générales, essais et

conditions d’essai –
Partie 41: Méthodes d’enregistrement de l’énergie et exigences relatives aux

compteurs à tarifs multiples et aux compteurs à énergies multiples

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5813-2

– 2 – IEC 62052-41:2022 © IEC 2022
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 9
3.1 Definitions related to energy meters . 9
3.2 Definitions related to energy registers . 9
3.3 Definitions related to demand . 10
3.4 Definitions related to interval data . 10
4 Standard electrical values. 11
5 Construction requirements . 11
5.1 General . 11
5.2 Maximum demand reset mechanism . 11
6 Meter marking and documentation . 11
7 Accuracy requirements . 11
8 Multi-energy and multi-rate meters . 11
8.1 General . 11
8.2 Overview. 12
8.3 Energy calculation methods – Calculation methods for active energy in multi-
phase systems . 12
8.4 Registers . 13
8.4.1 General . 13
8.4.2 Energy registers . 13
8.4.3 Maximum demand registers . 14
8.4.4 Load profile (interval) registers . 14
8.4.5 Billing profile data . 15
8.5 Tariff switching schedules . 15
8.6 Limits of error due to varying energy flow directions (bi-directional metering) . 16
8.7 Loss compensation . 17
9 Climatic requirements . 17
10 The effects of external influences . 17
11 Type test . 17
Annex A (informative) Example of test sequence for energy and load profile registers . 18
Annex B (informative) Example of test sequence for demand measurement . 20
Annex C (informative) Error calculations for varying power flow direction test . 21
Bibliography . 23

Figure C.1 – Vectorial and algebraic computation methods . 21

Table 1 – Minimum storage depth in days . 15
Table 2 – Relative error limits under varying energy flow directions for static meters for
AC active energy (classes 0,1 S, 0,2 S, 0,5 S, 0,5, 1 and 2) . 16
Table 3 – Relative error limits under varying energy flow directions for static meters for
AC reactive energy (classes 0,5 S, 1 S, 1, 2 and 3) . 16
Table A.1 – Example of season 1 switching schedule . 18
Table A.2 – Example of season 2 switching schedule . 19

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING EQUIPMENT –
GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS –

Part 41: Energy registration methods and requirements
for multi-energy and multi-rate meters

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.
IEC 62052-41 has been prepared by IEC technical committee 13: Electrical energy
measurement and control. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
13/1869/FDIS 13/1873/RVD
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.

– 4 – IEC 62052-41:2022 © IEC 2022
A list of all parts in the IEC 62052 series, published under the general title Electricity metering
equipment – General requirements, tests and test conditions, can be found on the IEC website.
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/standardsdev/publications.
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,
• 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.

INTRODUCTION
IEC 62052 series and IEC 62053 series define the physical, safety and metrological aspects of
electricity meters. This document defines the requirements for multi-energy and multi-rate
meters.
This part of IEC 62052 is to be used with relevant parts of the IEC 62052, IEC 62053,
IEC 62055-31, IEC 62058 and IEC 62059 series:
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: Electricity metering equipment (a.c.) – Particular requirements –
2003/AMD1:2016, Part 11: Electromechanical meters for active energy (classes 0,5,
1 and 2)
IEC 62053-21:2020, Electricity metering equipment – Particular requirements – Part 21:
Static meters for AC 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, 1 S, 1, 2 and 3)
IEC 62053-41:2021, Electricity metering equipment – Particular requirements – Part 41:
Static meters for DC energy (classes 0,5 and 1)
IEC 62055-31:2022, Electricity metering – Payment systems – Part 31: Particular
requirements – Static payment meters for active energy (classes 0,5,
1 and 2)
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 TR 62059-11:2002, E lectricity metering equipment – Dependability – Part 11: General
concepts
IEC TR 62059-21:2002, E lectricity metering equipment – Dependability – Part 21: Collection of
meter dependability data from the field

– 6 – IEC 62052-41:2022 © IEC 2022
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 of IEC 62052 is a standard for type testing electricity meters. This document is
intended to be used in conjunction with the relevant parts of IEC 62052, IEC 62053 and
IEC 62055-31. When any requirement in this document concerns an item already covered in
the relevant parts of IEC 62052, IEC 62053 and IEC 62055-31, the requirements of this
document take precedence.
The test levels are regarded as minimum values that provide for the proper functioning of the
meter under normal working conditions. For special application, other test levels might be
necessary and should be agreed on between the manufacturer and the purchaser.

ELECTRICITY METERING EQUIPMENT –
GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS –

Part 41: Energy registration methods and requirements
for multi-energy and multi-rate meters

1 Scope
This part of IEC 62052 applies only to newly manufactured multi-energy and/or multi-rate static
meters and it applies to their type tests only.
NOTE 1 For other general requirements, such as electrical, mechanical, safety, marking, dependability, etc., see
the relevant parts of IEC 62052 or IEC 62059. For accuracy requirements and other requirements specific to class
indices, see the relevant parts of IEC 62053.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on networks with voltage up to 1 000 V AC, or
1 500 V DC;
NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal
voltages. See IEC 62052-31:2015, Table 7.
NOTE 3 For meters designed for operation with LPITs, only the metering unit is considered a low voltage device. If
the LPITs are rated for voltages exceeding 1 000 V AC, or 1 500 V DC, the combination of the metering unit and
LPITs is not a low voltage device.
• have all functional elements, including add-on modules, enclosed in, or forming a single
meter case with exception of indicating displays;
• operate with integrated displays;
• operate with 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 and the relevant
IEC 62053 series documents only if such meters and their LPITs are tested together as directly
connected meters.
NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control
functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data
security functions. The relevant standards for these functions may apply in addition to the requirements of this
document. However, the requirements for such functions are outside the scope of this document.
NOTE 5 Product requirements for power monitoring devices and measurement functions such as voltage magnitude,
current magnitude, power, frequency, etc., are covered in IEC 61557-12:2018. However, devices compliant with IEC
61557-12:2018 are not intended to be used as billing meters, unless they are also compliant with IEC 62052-11 and
relevant IEC 62053-xx accuracy class standards.
NOTE 6 Product requirements for power quality monitoring instruments are covered in IEC 62586-1:2017.
Requirements for power quality measurement techniques (functions) are covered in IEC 61000-4-30:2015.
Requirements for testing of the power quality measurement functions are covered in IEC 62586-2:2017.

– 8 – IEC 62052-41:2022 © IEC 2022
This document does not apply to:
• meters for which the line-to-neutral voltage derived from nominal voltages exceeds
1 000 V AC, or 1 500 V DC;
• meters intended for connection with low power instrument transformers (LPITs as defined
in the IEC 61869 series of standards) when tested without such transformers;
• metering systems comprising multiple devices (except for LPITs) physically remote from one
another;
• portable meters;
NOTE 7 Portable meters are meters that are not permanently connected.
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
NOTE 8 Nominal values, accuracy classes, requirements and test methods for reference standard meters are
specified in IEC 62057-1 (First edition under preparation. Stage at the time of publication: IEC FDIS 62057-1:2022).
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment.
This document does not cover measures for the detection and prevention of fraudulent attempts
to compromise a meter’s performance (tampering).
2 Normative references
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.
IEC 62052-11:2020, Electricity metering equipment – General requirements, tests and test
conditions – Part 11: Metering equipment
IEC 62053-21:2020, Electricity metering equipment – Particular requirements – Part 21: Static
meters for AC 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, 1 S, 1, 2 and 3)
IEC 62053-41:2021, Electricity metering equipment – Particular requirements – Part 41: Static
meters for DC energy (classes 0,5 and 1)

3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62052-11:2020, as
well as the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Definitions related to energy meters
3.1.1
energy meter
instrument intended to measure electrical energy by integrating power with respect to time
[SOURCE: IEC 60050-300:2001, 313-01-35]
3.1.2
bidirectional meter
energy meter measuring energy flow in both directions
Note 1 to entry: For instance, energy received at the measuring point (for example import) and energy supplied at
the same measuring point (for example export).
3.1.3
multi-energy meter
energy meter which, in a single case, measures two or more types of electrical energy
Note 1 to entry: The electrical energy may include active energy, reactive energy or apparent energy.
3.1.4
multi-function meter
energy meter which, in a single case, incorporates other functions in addition to the energy
measurement functions
Note 1 to entry: Multi-function meters may include: maximum demand indicator, time switches, ripple control or
radio receivers, pulse output devices, power monitoring functions, power quality functions, input-output control
functions, communication function, etc.
3.1.5
multi-rate meter
energy meter provided with multiple registers, each becoming operative as defined by a tariff
schedule
Note 1 to entry: A tariff schedule could be held in the meter, operated on a time basis or a consumption basis, or
operated by external control signals.
[SOURCE: IEC 60050-300:2001, 313-06-09, modified to be better adapted to metering and note
added.]
3.2 Definitions related to energy registers
3.2.1
cumulative energy register
quantity of energy registered (active energy, reactive energy or apparent energy) over a period
of time or all the time
– 10 – IEC 62052-41:2022 © IEC 2022
3.2.2
delta energy register
quantity of energy registered (active energy, reactive energy or apparent energy) over a period
of time or all the time starting with the last activation of the register
3.2.3
total energy register
quantity of energy registered (active energy, reactive energy or apparent energy) over all the
time
Note 1 to entry: Total energy registers are normally cumulative registers.
3.2.4
rate energy register
quantity of energy registered (active energy, reactive energy or apparent energy) during certain
time periods of a day
Note 1 to entry: Rate registers are normally cumulative registers.
3.3 Definitions related to demand
3.3.1
demand
average value of power over an integration period
Note 1 to entry: Demand is calculated by dividing the energy registered during the integration period by the length
of the integration period.
3.3.2
demand integration period
interval of time of an hour [half-hour] [quarter-hour], etc., over which the registered electrical
energy is integrated in order to determine the average hourly [half-hourly] [quarter-hourly], etc.,
demand
EXAMPLE: 15 min, 30 min.
Note 1 to entry: Each demand integration period shall be of the same duration and one of which shall finish at 00:00
hours.
Note 2 to entry: Other methods for demand calculation are possible but are not covered in this document.
3.3.3
maximum demand
highest registered demand during a specific period, e.g. a billing period
3.4 Definitions related to interval data
3.4.1
profile
organized collection of historical values in one or more channels at regular specified intervals
3.4.2
channel
input or a register for raw data in a physical or logical electricity meter, used to measure energy
from different sources, to be identified and handled separately
3.4.3
objects
organized collection of all status information (time stamp + profile status) and registers in a
profile, organized in channels and entries

3.4.4
load profile
profile that stores a series of objects on one or more channels at regular, specified intervals
Note 1 to entry: Objects in the channel can be status information (status registers: date / time of data capturing,
profile status) and cumulative, delta, total, and rate energy registers and/or demand registers.
Note 2 to entry: A set of objects are stored at every end of the specified interval in an entry of the profile.
3.4.5
billing period
time between consecutive billing dates, nominally in months (e.g. one, three or six months), but
periods of days may also be required (e.g. 28, 31, 60, 89, 90, 91)
4 Standard electrical values
The requirements of IEC 62052-11:2020 and the relevant parts of IEC 62053 apply.
5 Construction requirements
5.1 General
The requirements of IEC 62052-11:2020 apply.
5.2 Maximum demand reset mechanism
These requirements are applicable to an electricity meter that supports maximum demand
measurement.
The meter shall maintain a register that contains the maximum demand over a billing period.
A feature shall exist to manually, or through a communication interface or automatically reset
the maximum demand registers at the end of the billing period.
When the maximum demand reset is performed, a reset event shall be logged.
The manual reset mechanism shall be sealable with a mechanical seal.
6 Meter marking and documentation
The requirements of IEC 62052-11:2020 apply.
7 Accuracy requirements
The requirements of the relevant parts of IEC 62053 apply. Additional accuracy requirements
are stated in Clause 8.
8 Multi-energy and multi-rate meters
8.1 General
The requirements as listed below may be applicable to an electricity meter that supports all
functionalities or a combination thereof.

– 12 – IEC 62052-41:2022 © IEC 2022
8.2 Overview
Multi-rate meters are able to measure and record data in different registers, each becoming
operative at specified time intervals corresponding to different tariffs. The rates can be applied
to a single quantity or multiple quantities (active, reactive, apparent energy or maximum
demand).
These values are recorded in cumulative, delta, total, and rate energy registers and/or demand
registers and can also be recorded in interval data (load profile data). Electricity registered is
either derived through reading energy registers or by reading and totalising interval data via
appropriate software systems.
Tests shall be done on the energy and demand variables supported by the multi-energy and
multi-rate meter. For multi-energy meters energy testing shall include tests on import and export
active energy and reactive energy on all four quadrants. Demand testing shall include tests on
active and apparent demand in the import and export direction.
Additional energy and demand variable testing as agreed between the user and manufacturer
may be stipulated.
The manufacturer shall provide to the testing laboratory any software tools which may be
required to test the energy and demand variables supported by the meter.
For testing purposes it shall be possible for the testing laboratory to read not only the meter’s
registers via communication ports but also to activate or deactivate the applicable registers in
order to test the variables agreed upon. It shall also be possible to specify time intervals
corresponding to different tariffs.
8.3 Energy calculation methods – Calculation methods for active energy in multi-
phase systems
NOTE 1 This subclause does not apply to DC meters covered by IEC 62053-41.
NOTE 2 Calculation methods for reactive energy are not covered in this version of the document.
Electricity meters designed and intended to be used on multiple phase systems may offer
different computation methods for aggregating the measurement values of the different phases
in order to support different measurement needs at unbalanced load conditions or when import
and export energy flows are present simultaneously in different phases.
The following computation methods can be used for active power in electricity meters:
a) Vectorial computation method:
The signed product of voltage, current and power factor of the different phases are summed
in the aggregate value.
𝑛𝑛
𝑃𝑃 =∑ 𝑃𝑃
𝑖𝑖=1 𝑖𝑖
Depending on the sign of the aggregated value the measured active power P should be
registered as import active power if it is positive (P ≥ 0):

𝑃𝑃 = P
import
or it shall be registered as export value if it is negative (P < 0):
𝑃𝑃 = P
export
b) Algebraic computation method:
The computation of the import aggregate value only includes the import phase values:
𝑛𝑛
𝑃𝑃 =∑ 𝑃𝑃 , for P > 0
import 𝑖𝑖
𝑖𝑖=1 i
The computation of the export aggregate value only includes the export phase values:
𝑛𝑛
𝑃𝑃 =∑ 𝑃𝑃 , for P < 0
export 𝑖𝑖=1 𝑖𝑖
i
c) Absolute computation method:
The absolute values of the product of voltage, current and power factor of the different
phases are summed in the aggregate value:
𝑛𝑛
∑ | |
𝑃𝑃 = 𝑃𝑃
𝑖𝑖=1 𝑖𝑖
It is desired that a register different to P and P is used for the value aggregated
import export
shall show the
by the absolute computation method. If this register is not available, P
import
aggregated P while register P shall be set to zero.
export
𝑃𝑃 =𝑃𝑃,  𝑃𝑃 = 0
import export
NOTE 3 The absolute computation method is used to prevent tampering in changing the phase polarity on the
meter’s terminals (typically implemented in pre-paid meters).
Manufacturers may elaborate and select other computation methods to be used for aggregating
energy values measured at different phases that shall be clearly described in the technical
documentation of the device. The specific computation method shall be clearly indicated and
shall be distinguished from the ones listed above.
The electricity meter may offer one or more simultaneous computation methods at the same
time. If the meter offers simultaneous calculation methods the result of the different calculation
methods shall be stored in different registers.
In addition to the aggregated power and energy values, values per phase can also be stored
and displayed in the meter.
8.4 Registers
8.4.1 General
The meter continuously measures and records various metering parameters and stores their
values in a suitable set of local registers for a predetermined period of time.
8.4.2 Energy registers
The errors between the cumulative total energy registers and the reference standard values for
the same energy quantity shall conform to the values as listed in the relevant
IEC 62053-21/22/23/24:2020 accuracy class standards under Table 3 – Acceptable percentage
error limits (single-phase meters and poly-phase meters with balanced loads or single-phase
loads) and IEC 62053-41:2021 for DC meters under Table 4 - Acceptable percentage error
limits.
The differences between the cumulative total energy registers and the rate energy registers for
the same energy quantity shall not exceed 1/10th of the values as listed in the relevant IEC
62053 xx21/22/23/24:2020 accuracy class standards for AC meters under Table 3 – Acceptable
(percentage) error limits (single-phase meters and poly-phase meters with balanced loads or
single-phase loads) and IEC 62053-41:2021 for DC meters under Table 4 - Acceptable
percentage error limits. The requirement is applicable for currents equal to or larger than 0,5
I .
max
– 14 – IEC 62052-41:2022 © IEC 2022
A minimum of at least six historical energy registrations from previous billing periods shall be
maintained in the electricity meter.
8.4.3 Maximum demand registers
The demand integration period shall be configurable and the following periods shall be available
as a minimum: 5 min, 10 min, 15 min, 20 min, 30 min and 60 min.
The errors between the maximum demand registers and the reference standard values for the
same demand quantity shall conform to the values as listed in the relevant
IEC 62053-21/22/23/24:2020 accuracy class standards for AC meters under Table 3 –
Acceptable percentage error limits (single-phase meters and poly-phase meters with balanced
loads or single-phase loads) and IEC 62053-41:2021 for DC meters under Table 4 - Acceptable
percentage error limits. The requirement is only applicable for currents equal to or larger than
I .
n
An example of a testing sequence is provided in Annex B.
A minimum of at least six historical maximum demand registrations from previous billing periods
shall be maintained in the electricity meter.
8.4.4 Load profile (interval) registers
8.4.4.1 General
The load profile interval period shall be configurable and the following intervals shall be
available as a minimum: 5 min, 10 min, 15 min, 20 min, 30 min and 60 min.
Each load profile interval period shall be of the same duration and one of which shall finish at
00:00 hours next day.
The calculations of:
a) the differences between the values of the cumulative registers and the values of the
interval registers;
b) the errors between the values of the cumulative registers and the reference standard
values;
c) the errors between the values of the interval registers and the reference standard values
for the same energy or demand quantity shall all conform to the values as listed in the relevant
IEC 62053-21/22/23/24:2020 accuracy class standards for AC meters under Table 3 –
Acceptable percentage error limits (single-phase meters and poly-phase meters with balanced
loads or single-phase loads) and IEC 62053-41:2021 for DC meters under Table 4 - Acceptable
percentage error limits.
8.4.4.2 Minimum storage
The load profile shall be maintained in the meter providing for a minimum of 28 800 entries.
Table 1 defines the minimum load profile storage depth in days according to varying recording
periods and the number of channels.
NOTE 1 The total of 28 800 entries is derived from the requirement to store 100 days of load profile data on 30 min
intervals for 6 channels.
NOTE 2 Where the meter supports more than one load profile, the minimum requirement will be 28 800 entries for
the load profile from where the energy or demand interval billing data can be obtained from.

Table 1 – Minimum storage depth in days
Recording period in minutes
Number of
channels 5 10 15 20 30 60
1 100 200 300 400 600 1 200
2 50 100 150 200 300 600
3 33 66 100 133 200 400
4 25 50 75 100 150 300
5 20 40 60 80 120 240
6 16 33 50 66 100 200
The minimum retention time for the load profile data in the absence of power shall be 100 days.
Other minimum and maximum storage entries may be required and shall be agreed on between
the purchaser and manufacturer.
8.4.4.3 Interval data format
8.4.4.3.1 Date and time
Time and date information shall be stored with every load profile entry. The time for the load
profile entry shall be the time at the end of the interval.
8.4.4.3.2 Statuses and events
Statuses and events recorded by the meter shall be stored with the load profile entry
corresponding to the time of occurrence. This document shall not be specific on which statuses
and events are to be recorded by the meter. It is up to the manufacturer to state which statuses
and events are supported.
8.4.5 Billing profile data
Provision shall be made for a profile collecting the data for billing periods at regular or irregular,
specified intervals.
Objects of a billing data profile can be status registers, cumulative, delta,-, total,- and rate
energy registers and/or demand registers.
Provision shall be made for the storing of historical billing profile data which are stored in a
separate set of local registers.
8.5 Tariff schedules
Tariff schedules for multi-rate meters shall be tested by randomly selecting switching variables
provided by the meter. These may include day, week, season and special day tariff switching
schedules.
The meter shall be configured with varying tariff schedules and then tested by submitting the
meter to loading conditions which will test the correct functioning of the tariff schedule.
An example of a testing sequence is provided in Annex A.

– 16 – IEC 62052-41:2022 © IEC 2022
8.6 Limits of error due to varying energy flow directions (bi-directional metering)
NOTE This subclause does not apply to DC meters covered by IEC 62053-41.
Meters can be continuously exposed to varying current directions due to for example self-
generation installed at a metering point. For these conditions, additional testing and test limits
are required.
During the test cos φ for active energy or sin φ for reactive energy should be negative (energy
export) in one phase and positive (energy import) in the two other phases.
Relative error limits for active energy due to the variation of the energy flow direction are based
on the error limits in IEC 62053-21:2020 and IEC 62053-22:2020 and presented in Table 2.
Table 2 – Relative error limits under varying energy flow directions for static
meters for AC active energy (classes 0,1 S, 0,2 S, 0,5 S, 0,5, 1 and 2)

Acceptable relative error limits in per cent
for meters of class
cos φ cos φ
Value of current
0,5 S and
a) a)
Phases A, B Phase C 0,1 S 0,2 S 1 2
0,5
0,5 inductive -0,5 inductive ±0,15 ±0,3 ±0,6 ±1,0 ±2,0
0,5 I
max
0,8 capacitive -0,8 capacitive ±0,15 ±0,3 ±0,6 ±1,0 ±2,0
a)
Phases A, B and C can represent any phase in any order.

The relative error for the varying energy flow direction test is given by the following formula
(details in Annex C):
𝐸𝐸 −𝐸𝐸
m ref
𝜀𝜀 = × 100 %
|𝐸𝐸 |+|𝐸𝐸 |+|𝐸𝐸 |
L1 L2 L3
where
ε is the relative error;
Ε is the energy registered by the meter under test;
m
Ε is the energy registered by the reference meter;
ref
Ε , Ε , Ε are the energies regis
...