EN IEC 60051-8:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Direkt wirkende anzeigende elektrische Meßgeräte und ihr Zubehör - Meßgeräte mit Skalenanzeige - Teil 8: Spezielle Anforderungen für Zubehör (IEC 60051-8:2017)Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires - Partie 8: Exigences particulières pour les accessoires (IEC 60051-8:2017)Direct acting indicating analogue electrical measuring instruments and their accessories - Part 8: Special requirements for accessories (IEC 60051-8:2017)17.220.20Measurement of electrical and magnetic quantitiesICS:Ta slovenski standard je istoveten z:EN IEC 60051-8:2018SIST EN 60051-8:2018en,fr,de01-junij-2018SIST EN 60051-8:2018SLOVENSKI
STANDARDSIST EN 60051-8:19951DGRPHãþD

SIST EN 60051-8:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 60051-8
March 2018 ICS 17.220.20
Supersedes
EN 60051-8:1989
English Version
Direct acting indicating analogue electrical measuring instruments and their accessories - Part 8: Special requirements for accessories (IEC 60051-8:2017)
Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires - Partie 8: Exigences particulières pour les accessoires (IEC 60051-8:2017)
Direkt wirkende anzeigende elektrische Meßgeräte und ihr Zubehör - Meßgeräte mit Skalenanzeige - Teil 8: Spezielle Anforderungen für Zubehör (IEC 60051-8:2017) This European Standard was approved by CENELEC on 2018-01-19. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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 © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60051-8:2018 E SIST EN 60051-8:2018

The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-10-19 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2021-01-19
This document supersedes EN 60051-8:1989.
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, and supports essential requirements of EU Directives.
For the relationship with EU Directives see informative Anne• ZZ, which is an integral part of this document.
Endorsement notice The text of the International Standard IEC 60051-8:2017 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 60051-91 NOTE Harmonized as EN 60051-92.
1 To be published. Stage at the time of publication: IEC CDV 60051-9:2018. 2 To be published. Stage at the time of publication: prEN 60051-9:2018. SIST EN 60051-8:2018

(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 measuring instruments and their accessories – Part1: Definitions and general requirements common to all parts EN 60051-1 2017
SIST EN 60051-8:2018
SIST EN 60051-8:2018
IEC 60051-8 Edition 5.0 2017-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Direct acting indicating analogue electrical measuring instruments and their accessories – Part 8: Special requirements for accessories
Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires –
Partie 8: Exigences particulières pour les accessoires
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 17.220.20
ISBN 978-2-8322-5192-8
– 2 – IEC 60051-8:2017 © IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Description, classification and compliance . 7 4.1 Description . 7 4.2 Classification . 7 4.3 Compliance with the requirements of this standard . 7 4.3.1 General . 7 4.3.2 Interchangeable accessories of limited interchangeability . 7 4.3.3 Non interchangeable accessories . 8 5 Requirements . 8 5.1 Reference conditions . 8 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 . 8 5.3.1 Nominal range of use . 8 5.3.2 Limits of variations. 9 5.3.3 Conditions for the determination of variations . 9 5.4 Operating uncertainty, overall system uncertainty and variations . 9 5.5 Electrical requirements . 9 5.5.1 Electrical safety requirements . 9 5.5.2 Self-heating . 9 5.5.3 Permissible overloads . 10 5.5.4 Limiting range of temperature . 11 5.5.5 Deviation from zero . 11 5.5.6 Electromagnetic compatibility (EMC) . 11 5.6 Constructional requirements . 11 5.6.1 General constructional requirements . 11 5.6.2 Damping . 11 5.6.3 Sealing to prevent access . 11 5.6.4 Scales . 11 5.6.5 Stopper. 11 5.6.6 Preferred values . 11 5.6.7 Adjusters, mechanical and/or electrical . 11 5.6.8 Effects of vibration and shock . 11 5.6.9 Degrees of protection provided by enclosure . 12 5.6.10 Terminals . 12 6 Information, markings and symbols . 12 6.1 Information . 12 6.2 Markings, symbols and their locations . 12 6.3 Markings relating to the reference values and nominal ranges of use of influence quantities . 12 SIST EN 60051-8:2018

IEC 60051-8:2017 © IEC 2017 – 3 –
6.4 The symbols for marking instruments and accessories . 12 6.5 Markings and symbols for terminals . 12 6.6 Instructions for use . 12 7 Package . 12 8 Test rules . 12 Annex A (normative)
Nonconformity classification of tests . 13 Bibliography . 14
Table 1 – Limits of the nominal range of use and permissible variations . 9 Table 2 – Overloads of short duration . 10 Table A.1 – Nonconformity classification of tests . 13
SIST EN 60051-8:2018
– 4 – IEC 60051-8:2017 © IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL MEASURING INSTRUMENTS AND THEIR ACCESSORIES –
Part 8: Special requirements for accessories
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 misinterpreta
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