SIST EN IEC 60051-2:2021

SLOVENSKI STANDARD
SIST EN IEC 60051-2:2021
01-september-2021
Nadomešča:
SIST EN 60051-2:1995
Neposredni kazalni analogni električni merilni instrumenti in njihov pribor - 2. del:
Posebne zahteve za ampermetre in voltmetre (IEC 60051-2:2018)
Direct acting indicating analogue electrical measuring instruments and their accessories
- Part 2: Special requirements for ammeters and voltmeters (IEC 60051-2:2018
Direkt wirkend anzeigende analoge elektrische Messgeräte und ihr Zubehör - Teil 2:
Spezielle Anforderungen für Strom- und Spannungs- Messgeräte (IEC 60051-2:2018)
Appareils mesureurs électriques indicateurs analogiques à action directe et leurs
accessoires - Partie 2: Exigences particulières pour les ampèremètres et les voltmètres
(IEC 60051-2:2018)
Ta slovenski standard je istoveten z: EN IEC 60051-2:2021
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN IEC 60051-2:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60051-2:2021

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SIST EN IEC 60051-2:2021


EUROPEAN STANDARD EN IEC 60051-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2021
ICS 17.220.20 Supersedes EN 60051-2:1989 and all of its amendments
and corrigenda (if any)
English Version
Direct acting indicating analogue electrical measuring
instruments and their accessories - Part 2: Special requirements
for ammeters and voltmeters
(IEC 60051-2:2018)
Appareils mesureurs électriques indicateurs analogiques à Direkt wirkend anzeigende analoge elektrische
action directe et leurs accessoires - Partie 2: Exigences Mess¬geräte und ihr Zubehör - Teil 2: Spezielle
particulières pour les ampèremètres et les voltmètres Anforderungen für Strom- und Spannungs- Messgeräte
(IEC 60051-2:2018) (IEC 60051-2:2018)
This European Standard was approved by CENELEC on 2018-10-04. 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 60051-2:2021 E

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SIST EN IEC 60051-2:2021
EN IEC 60051-2:2021 (E)
European foreword
The text of document 85/555/CDV, future edition 5 of IEC 60051-2, prepared by IEC/TC 85
"Measuring equipment for electrical and electromagnetic quantities" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 60051-2:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-04-30
document have to be withdrawn
This document supersedes EN 60051-2:1989 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 60051-2:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60051-7 NOTE Harmonized as EN IEC 60051-7
2

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SIST EN IEC 60051-2:2021
EN IEC 60051-2:2021 (E)
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 60051-1 2016 Direct acting indicating analogue electrical EN 60051-1 2017
measuring instruments and their
accessories – Part 1: Definitions and
general requirements common to all parts
IEC 60051-9 - Direct acting indicating analogue electrical EN 60051-9 -
measuring instruments and their
accessories - Part 9: Recommended test
methods
IEC 61869-2 - Instrument transformers - Part 2: Additional EN 61869-2 -
requirements for current transformers

3

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SIST EN IEC 60051-2:2021



IEC 60051-2

®


Edition 5.0 2018-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Direct acting indicating analogue electrical measuring instruments and their

accessories –

Part 2: Special requirements for ammeters and voltmeters




Appareils mesureurs électriques indicateurs analogiques à action directe et

leurs accessoires –


Partie 2: Exigences particulières pour les ampèremètres et les voltmètres













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 17.220.20 ISBN 978-2-8322-5956-6




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60051-2:2021
– 2 – IEC 60051-2:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Description, classification and compliance . 7
5 Requirements . 7
5.1 Reference conditions . 7
5.2 Limits of intrinsic uncertainty, fiducial value . 8
5.2.1 Limits of intrinsic uncertainty . 8
5.2.2 Correspondence between intrinsic uncertainty and accuracy class . 8
5.2.3 Fiducial value . 8
5.3 Nominal range of use and variations . 9
5.3.1 Nominal range of use . 9
5.3.2 Limits of variations. 10
5.3.3 Conditions for the determination of variations . 10
5.4 Operating uncertainty, overall system uncertainty and variations . 10
5.5 Electrical requirements . 10
5.5.1 Electrical safety requirements . 10
5.5.2 Self-heating . 10
5.5.3 Permissible overloads . 10
5.5.4 Limiting range of temperature . 12
5.5.5 Deviation from zero . 12
5.5.6 Electromagnetic compatibility (EMC) . 12
5.6 Constructional requirements . 12
5.6.1 General constructional requirements . 12
5.6.2 Damping . 12
5.6.3 Sealing to prevent access . 13
5.6.4 Scales . 13
5.6.5 Stopper. 13
5.6.6 Preferred values . 13
5.6.7 Adjusters, mechanical and/or electrical . 14
5.6.8 Effects of vibration and shock . 14
5.6.9 Degrees of protection provided by enclosure . 14
5.6.10 Terminals . 14
6 Information, markings and symbols . 14
6.1 Information . 14
6.2 Markings, symbols and their locations . 14
6.3 Markings relating to the reference values and nominal ranges of use of
influence quantities . 14
6.4 The symbols for marking instruments and accessories . 14
6.5 Markings and symbols for terminals . 14
6.5.1 Requirements for markings . 14
6.5.2 Earthing (grounding) terminals . 15
6.5.3 Measuring circuit terminals . 15
6.5.4 Special markings for terminals . 15

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SIST EN IEC 60051-2:2021
IEC 60051-2:2018 © IEC 2018 – 3 –
6.6 Instructions for use . 15
7 Package . 15
8 Test rules . 15
Annex A (normative) Nonconformity classification of tests . 16
Bibliography . 17

Table 1 – Limits of the nominal range of use and permissible variations in addition to
those given in Table 3 of IEC 60051-1:2016 . 9
Table 2 – Overloads of short duration for ammeters and voltmeters . 12
Table A.1 – Nonconformity classification of tests . 16

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SIST EN IEC 60051-2:2021
– 4 – IEC 60051-2:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES –

Part 2: Special requirements for ammeters and voltmeters

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 60051-2 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This fifth edition cancels and replaces the fourth edition published in 1984. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

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SIST EN IEC 60051-2:2021
IEC 60051-2:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
85/555/CDV 85/578A/RVC

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.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be used in conjunction with IEC 60051-1:2016.
A list of all parts in the IEC 60051 series, published under the general title Direct acting
indicating analogue electrical measuring instruments and their accessories, 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.

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SIST EN IEC 60051-2:2021
– 6 – IEC 60051-2:2018 © IEC 2018
INTRODUCTION
IEC 60051 is published in separate parts according to the following structure and under the
general title Direct acting indicating analogue electrical measuring instruments and their
accessories.
Part 1: Definitions and general requirements common to all parts
Part 2: Special requirements for ammeters and voltmeters
Part 3: Special requirements for wattmeters and varmeters
Part 4: Special requirements for frequency meters
Part 5: Special requirements for phase meters, power factor meters and synchroscopes
Part 6: Special requirements for ohmmeters (impedance meters) and conductance meters
Part 7: Special requirements for multi-function instruments
Part 8: Special requirements for accessories
Part 9: Recommended test methods
IEC 60051-2 is not complete in itself and is read in conjunction with IEC 60051-1.
All of these parts are arranged in the same format and a st
...