Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements (IEC 61557-1:2019)

This part of IEC 61557 specifies the general requirements applicable to measuring and
monitoring equipment for testing the electrical safety in low-voltage distribution systems with
nominal voltages up to 1 000 V AC and 1 500 V DC.
When measuring equipment or measuring installations involve measurement tasks of various
measuring equipment covered by this series of standards, then the part of this series relevant
to each of the measurement tasks is applicable.
NOTE The term "measuring equipment" will hereafter be used to designate "testing, measuring and monitoring
equipment".
Other parts of IEC 61557 can specify additional requirements or deviations.
This document does not cover functional safety or cybersecurity

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 1: Allgemeine Anforderungen (IEC 61557-1:2019)

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection - Partie 1: Exigences générales (IEC 61557-1:2019)

IEC 61557-1:2019 est disponible sous forme de IEC 61557-1:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61557-1:2019 spécifie les exigences générales applicables aux dispositifs de mesure et de surveillance utilisés aux fins d'essai de la sécurité électrique dans les réseaux de distribution basse tension au plus égale à 1 000 V c.a. et 1 500 V c.c. Lorsque des appareils ou installations de mesure impliquent des mesures avec différents appareils couverts par la présente série de normes, la partie de cette série de normes qui est pertinente pour un type de mesure donné est applicable. Les autres parties de l'IEC 61557 peuvent spécifier des exigences supplémentaires ou des écarts. La présente norme ne couvre pas la sécurité fonctionnelle ou la cybersécurité. L'IEC 61557-1:2019 annule et remplace la deuxième édition parue en 2007. Cette édition constitue une révision technique. Cette troisième édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) alignement des termes sur ceux de l'IEC 60050; b) mesure de l'incertitude revue conformément aux équations données en 4.2 du Guide ISO/IEC 98-3:2008 (GUM); c) mise à jour des références aux exigences de sécurité et de CEM; d) mise à jour des références au marquage et aux instructions de fonctionnement; e) mise à jour des références aux essais de sécurité et de CEM; f) l'Annexe A comporte une explication du GUM; g) l'Annexe B porte sur les aspects environnementaux.

Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti do 1 kV in enosmerne napetosti do 1,5 kV - Oprema za preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov - 1. del: Splošne zahteve (IEC 61557-1:2019)

Ta del standarda IEC 61557 določa splošne zahteve, ki se uporabljajo za merilno in nadzorno opremo za preskušanje električne varnosti v nizkonapetostnih razdelilnih sistemih z nazivnimi napetostmi do 1000 V izmenične napetosti in 1500 V enosmerne napetosti.
Kadar merilna oprema ali merilne instalacije vključujejo merilna opravila različne merilne opreme, ki jo zajema ta serija standardov, se uporablja tisti del te serije, ki se navezuje na posamezno merilno opravilo.
OPOMBA: Izraz »merilna oprema« se bo v nadaljevanju uporabljal za »opremo za preskušanje, merjenje in nadzorovanje«.
Drugi deli standarda IEC 61557 lahko določajo dodatne zahteve ali odstopanja. Ta dokument ne zajema funkcionalne ali kibernetske varnosti.

General Information

Status
Published
Public Enquiry End Date
29-Apr-2018
Publication Date
01-Feb-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Dec-2021
Due Date
03-Mar-2022
Completion Date
02-Feb-2022

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN IEC 61557-1:2022
01-marec-2022
Nadomešča:
SIST EN 61557-1:2007

Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti

do 1 kV in enosmerne napetosti do 1,5 kV - Oprema za preskušanje, merjenje ali
nadzorovanje zaščitnih ukrepov - 1. del: Splošne zahteve (IEC 61557-1:2019)

Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC -

Equipment for testing, measuring or monitoring of protective measures - Part 1: General

requirements (IEC 61557-1:2019)
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 1:
Allgemeine Anforderungen (IEC 61557-1:2019)

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1

500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de
protection - Partie 1: Exigences générales (IEC 61557-1:2019)
Ta slovenski standard je istoveten z: EN IEC 61557-1:2021
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.080.01 Električna izolacija na Electrical insulation in
splošno general
29.240.01 Omrežja za prenos in Power transmission and
distribucijo električne energije distribution networks in
na splošno general
SIST EN IEC 61557-1:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61557-1:2022
---------------------- Page: 2 ----------------------
SIST EN IEC 61557-1:2022
EUROPEAN STANDARD EN IEC 61557-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021

ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-1:2007 and all of its amendments

and corrigenda (if any)
English Version
Electrical safety in low voltage distribution systems up to 1 000 V
AC and 1 500 V DC - Equipment for testing, measuring or
monitoring of protective measures - Part 1: General
requirements
(IEC 61557-1:2019)

Sécurité électrique dans les réseaux de distribution basse Elektrische Sicherheit in Niederspannungsnetzen bis AC 1

tension au plus égale à 1 000 V c.a. et 1 500 V c.c. - 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder

Dispositifs de contrôle, de mesure ou de surveillance de Überwachen von Schutzmaßnahmen - Teil 1: Allgemeine

mesures de protection - Partie 1: Exigences générales Anforderungen
(IEC 61557-1:2019) (IEC 61557-1:2019)

This European Standard was approved by CENELEC on 2021-11-10. 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 61557-1:2021 E
---------------------- Page: 3 ----------------------
SIST EN IEC 61557-1:2022
EN IEC 61557-1:2021 (E)
European foreword

The text of document 85/689/FDIS, future edition 3 of IEC 61557-1, 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 61557-1:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2022-08-10

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-11-10

document have to be withdrawn

This document supersedes EN 61557-1:2007 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 Standardization Request given to CENELEC by the

European Commission and the European Free Trade Association.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Standard IEC 61557-1:2019 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60359 NOTE Harmonized as EN 60359
IEC 60364-1 NOTE Harmonized as HD 60364-1
IEC 60364-6 NOTE Harmonized as HD 60364-6
IEC 60664-1 NOTE Harmonized as EN IEC 60664-1
IEC 61326 (series) NOTE Harmonized as EN IEC 61326 (series)
IEC 61326-2-4 NOTE Harmonized as EN IEC 61326-2-4
IEC 62430 NOTE Harmonized as EN IEC 62430
IEC 62474 NOTE Harmonized as EN IEC 62474
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SIST EN IEC 61557-1:2022
EN IEC 61557-1:2021 (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 60038 (mod) 2009 IEC standard voltages EN 60038 2011
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- - + corrigendum May 1993
+ A1 1999 + A1 2000
+ A2 2013 + A2 2013
IEC 61010-1 2010 Safety requirements for electrical EN 61010-1 2010
equipment for measurement, control, and
laboratory use - Part 1: General
requirements
+ A1 (mod) 2016 + A1 2019
IEC 61010-031 - Safety requirements for electrical EN 61010-031 -
equipment for measurement, control and
laboratory use - Part 031: Safety
requirements for hand-held probe
assemblies for electrical measurement and
test
IEC 61010-2-030 2017 Safety requirements for electrical EN IEC 61010-2-030 2021
equipment for measurement, control, and
laboratory use - Part 2-030: Particular
requirements for equipment having testing
or measuring circuits
- - + A11 2021
IEC 61010-2-032 - Safety requirements for electrical EN IEC 61010-2-032 -
equipment for measurement, control and
laboratory use - Part 2-032: Particular
requirements for hand-held and hand-
manipulated current sensors for electrical
test and measurement
---------------------- Page: 5 ----------------------
SIST EN IEC 61557-1:2022
EN IEC 61557-1:2021 (E)
Publication Year Title EN/HD Year
IEC 61010-2-034 2017 Safety requirements for electrical EN IEC 61010-2-034 2021
equipment for measurement, control, and
laboratory use - Part 2-034: Particular
requirements for measurement equipment
for insulation resistance and test equipment
for electric strength
- - + A11 2021
IEC 61326-1 2012 Electrical equipment for measurement, EN 61326-1 2013
control and laboratory use - EMC
requirements - Part 1: General
requirements
IEC 61557-8 2014 Electrical safety in low voltage distribution EN 61557-8 2015
systems up to 1 000 V a.c. and 1 500 V d.c.
- Equipment for testing, measuring or
monitoring of protective measures - Part 8:
Insulation monitoring devices for IT
systems
IEC 61557-9 2014 Electrical safety in low voltage distribution EN 61557-9 2015
systems up to 1 000 V a.c. and 1 500 V d.c.
- Equipment for testing, measuring or
monitoring of protective measures - Part 9:
Equipment for insulation fault location in IT
systems
---------------------- Page: 6 ----------------------
SIST EN IEC 61557-1:2022
IEC 61557-1
Edition 3.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
1 500 V d.c. – Equipment for testing, measuring or monitoring of protective
measures
Part 1: General requirements
Sécurité électrique dans les réseaux de distribution basse tension au plus égale
à 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou de
surveillance de mesures de protection
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-7141-4

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
---------------------- Page: 7 ----------------------
SIST EN IEC 61557-1:2022
– 2 – IEC 61557-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Requirements ................................................................................................................ 12

4.1 General requirements ........................................................................................... 12

4.2 Influence quantities – Operating uncertainty (B), percentage operating

uncertainty (B [%]) ................................................................................................ 12

4.3 Rated operating conditions ................................................................................... 13

4.4 Battery test facility ................................................................................................ 14

4.5 Safety ................................................................................................................... 14

4.6 Electromagnetic compatibility ................................................................................ 14

4.6.1 Immunity ........................................................................................................ 14

4.6.2 Emission ........................................................................................................ 14

4.7 Mechanical strength against vibration ................................................................... 14

5 Marking and operating instructions ................................................................................ 15

5.1 General ................................................................................................................. 15

5.2 Marking ................................................................................................................. 15

5.3 Operating instructions ........................................................................................... 15

5.3.1 Performance requirements ............................................................................. 15

5.3.2 Other information ........................................................................................... 15

6 Tests ............................................................................................................................. 16

6.1 General ................................................................................................................. 16

6.2 Operating uncertainty ............................................................................................ 16

6.2.1 General ......................................................................................................... 16

6.2.2 Influence of changing position ....................................................................... 16

6.2.3 Influence of temperature ................................................................................ 16

6.2.4 Influence of the supply voltage ...................................................................... 16

6.3 Battery test facility ................................................................................................ 16

6.4 Safety tests ........................................................................................................... 16

6.5 EMC tests ............................................................................................................. 16

6.6 Mechanical requirements ...................................................................................... 17

6.7 Marking and operating instructions ........................................................................ 17

6.8 Records ................................................................................................................ 17

Annex A (informative) Explanation of the application of GUM in series IEC 61557 ............... 18

A.1 Overview............................................................................................................... 18

A.2 Basic model of evaluation of results under operational conditions ......................... 18

A.2.1 General ......................................................................................................... 18

A.2.2 Standard uncertainty of a result ..................................................................... 18

A.2.3 Expanded uncertainty .................................................................................... 19

A.2.4 Relative operating uncertainty ....................................................................... 19

A.2.5 Calibration uncertainty ................................................................................... 19

A.3 Operating uncertainty calculations as basis for 4.1 ............................................... 20

A.3.1 Standard uncertainty ..................................................................................... 20

A.3.2 Operating uncertainty in accordance with 4.1 ................................................. 20

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SIST EN IEC 61557-1:2022
IEC 61557-1:2019 © IEC 2019 – 3 –

Annex B (informative) Environmental aspects ...................................................................... 21

B.1 Overview............................................................................................................... 21

B.2 Guidelines to establish a material declaration and end-of-life information ............. 21

B.2.1 General ......................................................................................................... 21

B.2.2 Guidelines for material declaration ................................................................ 22

B.2.3 Guidelines for end-of-life (EoL) ...................................................................... 22

B.2.4 Example of a material declaration and end-of-life information ........................ 22

Bibliography .......................................................................................................................... 25

Figure B.1 – Components listed for EoL of a product ............................................................ 24

Table B.1 – Material content according to IEC 62474 material classes .................................. 23

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SIST EN IEC 61557-1:2022
– 4 – IEC 61557-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
UP TO 1 000 V AC AND 1 500 V DC –
EQUIPMENT FOR TESTING, MEASURING OR MONITORING
OF PROTECTIVE MEASURES
Part 1: General requirements
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 61557-1 has been prepared by technical committee 85: Measuring

equipment for electrical and electromagnetic quantities.

This third edition cancels and replaces the second edition published in 2007. This edition

constitutes a technical revision.

This third edition includes the following significant technical changes with respect to the

previous edition:
a) terms aligned with IEC 60050;
b) measurement of uncertainty revised according to the equations in 4.2 of
ISO/IEC Guide 98-3:2008 (GUM);
c) updated references for safety and EMC requirements;
---------------------- Page: 10 ----------------------
SIST EN IEC 61557-1:2022
IEC 61557-1:2019 © IEC 2019 – 5 –
d) updated references for marking and operating instructions;
e) updated references for testing safety and EMC;
f) Annex A contains an explanation of GUM;
g) Annex B addresses environmental aspects.
The text of this International Standard is based on the following documents:
FDIS Report on voting
85/689/FDIS 85/692/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.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61557 series, published under the general title Electrical safety in

low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing,

measuring or monitoring of protective measures, 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.
---------------------- Page: 11 ----------------------
SIST EN IEC 61557-1:2022
– 6 – IEC 61557-1:2019 © IEC 2019
INTRODUCTION

IEC 60364-6 stipulates standardized conditions for the initial test of power installations

in TN, TT or IT systems for continuous monitoring and for testing these installations after

modifications. In addition to general references for the performance of the tests, IEC 60364-6

contains requirements that have to be verified by measurements. Only in a few instances, for

example when measuring the insulation resistance, does IEC 60364-6 contain details of the

characteristics of the measuring device to be used. Circuits which are given as examples in

IEC 60364-6, and referred to within the text of that document, are generally not suitable for

practical use.

The tests are carried out in installations where hazardous voltages can occur and where

careless use or a defect in the equipment can easily cause an accident. Therefore, the

technician has to rely on measuring devices which ensure safe test methods, in addition to

simplifying the measurements.

The application of the general safety regulations for electrical and electronic measuring

devices (IEC 61010-1) for testing the protective measures is not sufficient in itself. The

performance of measurements in the installation can cause hazards not only to the technician,

but also to third persons, depending on the measuring method used.

Likewise, reliable and comparable results of measurement with measuring devices from

different manufacturers are an important precondition in order to obtain an objective

assessment about the installation, for example when the installation is handed over for

periodic tests, for continuous insulation monitoring or in the case of performance warranty.

The IEC 61557 series has been established with the aim of stipulating common principles for

measuring and monitoring equipment for testing electrical safety and measuring performances

in systems with nominal voltages up to 1 000 V AC and 1 500 V DC which correspond to the

above-mentioned characteristics.

For that reason, the following common requirements have been stipulated in IEC 61557-1

(other parts of IEC 61557 can specify additional requirements or deviations):
– protection against extraneous voltages;

– class II protection (except insulation monitoring devices and insulation fault location

systems);

– requirements and safety precautions against hazardous touch voltages at the measuring

device;

– requirements for the assessment of connection configurations with respect to wiring errors

in the tested equipment;
– special mechanical requirements;
– measuring methods;
– measured quantity;
– specification of the maximum operating uncertainty;

– requirements for testing the influencing quantity and the calculation of the operating

uncertainty;

– uncertainties of the measuring device at the thresholds specified in the respective

standards;

– specification of the nature of type and routine tests and the required conditions for testing.

Contrary to the usual convention, terms and definitions that occur more than once in another

part of the series are listed in IEC 61557-1:2019, Clause 3. Only terms and definitions specific

to the respective part of IEC 61557 are listed in Clause 3 of that part.
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SIST EN IEC 61557-1:2022
IEC 61557-1:2019 © IEC 2019 – 7 –
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
UP TO 1 000 V AC AND 1 500 V DC –
EQUIPMENT FOR TESTING, MEASURING OR MONITORING
OF PROTECTIVE MEASURES
Part 1: General requirements
1 Scope

This part of IEC 61557 specifies the general requirements applicable to measuring and

monitoring equipment for testing the electrical safety in low-voltage distribution systems with

nominal voltages up to 1 000 V AC and 1 500 V DC.

When measuring equipment or measuring installations involve measurement tasks of various

measuring equipment covered by this series of standards, then the part of this series relevant

to each of the measurement tasks is applicable.

NOTE The term "measuring equipment" will hereafter be used to designate "testing, measuring and monitoring

equipment".
Other parts of IEC 61557 can specify additional requirements or deviations.
This document does not cover functional safety or cybersecurity.
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 60038:2009, IEC standard voltages
IEC 60529:1989, Degrees of protection provided by enclosures (IP code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013

IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 1: General requirements
IEC 61010-1:2010/AMD1:2016

IEC 61010-031, Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 031: Safety requirements for hand-held and hand-manipulated

assemblies for electrical test and measurement
__________

A consolidated version of this publication exists, comprising IEC 60529:1989, IEC 60529:1989/AMD1:1999 and

IEC 60529:1989/AMD2:2013.

A consolidated version of this publication exists, comprising IEC 61010-1:2010 and

IEC 61010-1:2010/AMD 1:2016.
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SIST EN IEC 61557-1:2022
– 8 – IEC 61557-1:2019 © IEC 2019

IEC 61010-2-030:2017, Safety requirements for electrical equipment for measurement, control,

and laboratory use – Part 2-030: Particular requirements for equipment having testing or

measuring circuits

IEC 61010-2-032, Safety requirements for electrical equipment for measurement, control, and

laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated

current sensors for electrical test and measurement

IEC 61010-2-034:2017, Safety requirements for electrical equipment for measurement, control,

and laboratory use – Part 2-034: Particular requirements for measurement equipment for

insulation resistance and test equipment for electric strength

IEC 61326-1:2012, Electrical equipment for measurement, control and laboratory use – EMC

requirements – Part 1: General requirements

IEC 61557-8:2014, Electrical safety in low voltage distribution systems up to 1 000 V AC and

1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 8:

Insulation monitoring devices for IT systems

IEC 61557-9:2014, Electrical safety in low voltage distribution systems up to 1 000 V AC and

1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 9:

Equipment for insulation fault location in IT systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the follo

...

SLOVENSKI STANDARD
oSIST prEN 61557-1:2018
01-april-2018

(OHNWULþQDYDUQRVWYQL]NRQDSHWRVWQLKUD]GHOLOQLKVLVWHPLKL]PHQLþQHQDSHWRVWLGR

N9LQHQRVPHUQHQDSHWRVWLGRN92SUHPD]DSUHVNXãDQMHPHUMHQMHDOL
QDG]RURYDQMH]DãþLWQLKXNUHSRYGHO6SORãQH]DKWHYH

Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -

Equipment for testing, measuring or monitoring of protective measures - Part 1: General

requirements
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 1:
Allgemeine Anforderungen

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1

500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de
protection - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: prEN 61557-1:2018
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
oSIST prEN 61557-1:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 61557-1:2018
85/629/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61557-1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2018-02-09 2018-05-04
SUPERSEDES DOCUMENTS:
85/607/CD,85/621/CC
IEC TC 85 : MEASURING EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES
SECRETARIAT: SECRETARY:
China Mr Bo Chen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 23,TC 44,TC 62,TC 64,TC 66,TC 108
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they

are aware and to provide supporting documentation.
TITLE:

Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for

testing, measuring or monitoring of protective measures - Part 1: General requirements

PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:

Copyright © 2017 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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1 CONTENTS

3 FOREWORD ...................................................................................................................... - 4 -

4 INTRODUCTION ................................................................................................................ - 6 -

5 1 Scope ......................................................................................................................... - 7 -

6 2 Normative references .................................................................................................. - 7 -

7 3 Terms, definitions and symbols ................................................................................... - 8 -

8 4 Requirements ........................................................................................................... - 11 -

9 4.1 General requirements ....................................................................................... - 11 -

10 4.2 Influence quantities .......................................................................................... - 11 -

11 4.2.1 General ..................................................................................................... - 11 -

12 4.2.2 Operating uncertainty (B), percentage operating uncertainty (B [%]) ......... - 12 -

13 4.3 Rated operating conditions ............................................................................... - 13 -

14 4.4 Battery test facility ............................................................................................ - 13 -

15 4.5 Safety .............................................................................................................. - 13 -

16 4.6 Electromagnetic compatibility ........................................................................... - 13 -

17 4.7 Mechanical strength against vibration ............................................................... - 13 -

18 5 Marking and operating instructions ............................................................................ - 14 -

19 5.1 General ............................................................................................................ - 14 -

20 5.2 Marking ............................................................................................................ - 14 -

21 5.3 Operating instructions ...................................................................................... - 14 -

22 5.3.1 Performance specifications ....................................................................... - 14 -

23 5.3.2 Other information ...................................................................................... - 14 -

24 6 Tests ........................................................................................................................ - 14 -

25 6.1 General ............................................................................................................ - 14 -

26 6.2 Operating uncertainty ....................................................................................... - 15 -

27 6.2.1 Influence of changing position ................................................................... - 15 -

28 6.2.2 Influence of temperature ........................................................................... - 15 -

29 6.2.3 Influence of the supply voltage .................................................................. - 15 -

30 6.2.4 Influence of specific parameters ................................................................ - 15 -

31 6.3 Battery test facility ............................................................................................ - 15 -

32 6.4 Safety tests ...................................................................................................... - 15 -

33 6.5 Mechanical requirements ................................................................................. - 15 -

34 6.6 Marking and operating instructions ................................................................... - 15 -

35 6.7 Records ........................................................................................................... - 15 -

36 Annex A (informative) Explanation of the application of GUM in series IEC 61557 ............ - 16 -

37 A.1 Introduction ...................................................................................................... - 16 -

38 A.2 Normative references ....................................................................................... - 16 -

39 A.3 Basic model of evaluation of results under operational conditions .................... - 16 -

40 A.3.1 Standard uncertainty of a result ................................................................ - 16 -

41 A.3.2 Expanded uncertainty ............................................................................... - 16 -

42 A.3.3 Relative operating uncertainty ................................................................... - 17 -

43 A.3.4 Calibration uncertainty .............................................................................. - 17 -

44 A.4 Operating uncertainty calculations as base for Clause 4.1 ................................ - 17 -

45 A.4.1 Standard uncertainty ................................................................................. - 17 -

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46 A.4.2 Operating uncertainty in 4.1 ...................................................................... - 18 -

47 Annex B (informative) Introduction to Eco-design ............................................................. - 19 -

48 B.1 Introduction ...................................................................................................... - 19 -

49 B.2 Guidelines to establish a material declaration and for end-of-life information .... - 19 -

50 B.2.1 General ..................................................................................................... - 19 -

51 B.2.2 Guidelines for material declaration ............................................................ - 20 -

52 B.2.3 Guidelines for End-of-life (EoL) ................................................................. - 20 -

53 B.2.4 Example of a material-declaration and end-of-life information ................... - 20 -

54 Bibliography ..................................................................................................................... - 22 -

56 Figure B.3 – Components listed for EoL of a product ........................................................ - 21 -

58 Table B.1 – Material content according to IEC 62474 material classes ............................. - 20 -

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60 INTERNATIONAL ELECTROTECHNICAL COMMISSION
61 ____________
63 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO
64 1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING AND
65 MEASURING OR MONITORING OF PROTECTIVE MEASURES
67 Part 1: General requirements
69 FOREWORD

70 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

71 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

72 international co-operation on all questions concerning standardization in the electrical and electronic fields. To

73 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

74 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

75 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

76 in the subject dealt with may participate in this preparatory work. International, governmental and non-

77 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

78 with the International Organization for Standardization (ISO) in accordance with conditions determined by

79 agreement between the two organizations.

80 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

81 consensus of opinion on the relevant subjects since each technical committee has representation from all

82 interested IEC National Committees.

83 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

84 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

85 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

86 misinterpretation by any end user.

87 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

88 transparently to the maximum extent possible in their national and regional publications. Any divergence

89 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

90 the latter.

91 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

92 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

93 services carried out by independent certification bodies.

94 6) All users should ensure that they have the latest edition of this publication.

95 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

96 members of its technical committees and IEC National Committees for any personal injury, property damage or

97 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

98 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

99 Publications.

100 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

101 indispensable for the correct application of this publication.

102 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

103 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

104 International Standard IEC 61557-1 has been prepared by subcommittee TC85/WG8:

105 MEASURING AND MONITORING EQUIPMENT FOR TESTING PROTECTIVE DEVICES IN
106 ENERGY DISTRIBUTION SYSTEMS, of IEC technical committee 85: MEASURING
107 EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES

108 This third edition cancels and replaces the second edition published in 2007. This edition

109 constitutes a technical revision.

110 This third edition includes the following significant technical changes with respect to the

111 previous edition:
112 a) Terms aligned with IEV
113 b) Measurement of uncertainty revised according to GUM formula in 4.2
114 c) Updated references for safety and EMC requirements
115 d) Updated references for marking and operating instructions
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116 e) Updated references for testing safety and EMC
117 f) Annex A contains an explanation of GUM
118 g) Annex B addresses Eco-design
119
120 The text of this standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
121

122 Full information on the voting for the approval of this standard can be found in the report on

123 voting indicated in the above table.

124 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

125 The committee has decided that the contents of this publication will remain unchanged until

126 the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

127 related to the specific publication. At this date, the publication will be
128 • reconfirmed,
129 • withdrawn,
130 • replaced by a revised edition, or
131 • amended.
132

133 The National Committees are requested to note that for this publication the stability date

134 is 2025.

135 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE

136 DELETED AT THE PUBLICATION STAGE.
137
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138 INTRODUCTION

139 IEC 60364-6 stipulates standardized conditions for the initial test of power installations in TN, TT or IT

140 systems for continuous monitoring and for testing these installations after modifications. In addition to

141 general references for the performance of the tests, IEC 60364-6 contains requirements that have to

142 be verified by measurements. Only in a few instances, for example when measuring the insulation

143 resistance, the standard contains details of the characteristics of the measuring device to be used.

144 Circuits which are given as examples in IEC 60364-6, and referred to within the text, are generally not

145 suitable for practical use.

146 The tests are carried out in installations where hazardous voltages can occur and where careless use

147 or a defect in the equipment can easily cause an accident. Therefore, the technician has to rely on

148 measuring devices which ensure safe test methods, apart from simplification of the measurements.

149 The application of the general safety regulations for electrical and electronic measuring devices

150 (IEC 61010-1) for testing the protective measures is not sufficient in itself. The performance of

151 measurements in the installation can cause hazards not only to the technician, but also to third

152 persons, depending on the measuring method.

153 Likewise, reliable and comparable results of measurement with measuring devices from different

154 manufacturers are an important precondition in order to obtain an objective judgement about the

155 installation, for example when the installation is handed over for periodic tests, for continuous

156 insulation monitoring or in the case of performance warranty.

157 The series of IEC 61557 has been established with the aim of stipulating common principles for

158 measuring and monitoring equipment for testing electrical safety and measuring performances in

159 systems with nominal voltages up to 1 000 V AC and 1 500 V DC which correspond to the above-

160 mentioned characteristics.

161 For this reason, the following common specifications have been stipulated in Part 1 and other

162 individual parts of IEC 61557:
163 – protection against extraneous voltages;

164 – protection class II (except insulation monitoring devices and insulation fault location systems);

165 – specifications and safety precautions against hazardous touch voltages at the measuring device;

166 – specifications for the judgement of connection configurations with respect to wiring errors in the

167 tested equipment;
168 – special mechanical requirements;
169 – measuring methods;
170 – measured quantity;
171 – specification of the maximum operating uncertainty;

172 – specifications for testing the influencing quantity and the calculation of the operating uncertainty;

173 – uncertainties of the measuring device at the thresholds specified in the respective standards;

174 – specification of the nature of type and routine tests and the required conditions for testing.

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175 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
176 UP TO 1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING
177 OR MONITORING OF PROTECTIVE MEASURES -
178
179 Part 1: General requirements
180
181 1 Scope

182 This part of IEC 61557 specifies the general requirements for measuring and monitoring equipment for

183 testing the electrical safety in low voltage distribution systems with nominal voltages up to 1 000 V AC

184 and 1 500 V DC.

185 When measuring equipment or measuring installations involve measurement tasks of various

186 measuring equipment covered by this series of standards, then the part of this series of standards

187 relevant to each of the measurement tasks is applicable.

188 NOTE The term "measuring equipment" will hereafter be used to designate "testing, measuring and monitoring equipment".

189 2 Normative references

190 The following documents, in whole or in part, are normatively referenced in this document and are

191 indispensable for its application. For dated references, only the edition cited applies. For undated

192 references, the latest edition of the referenced document (including any amendments) applies.

193 IEC 60038:2009, Ed. 7.0, IEC standard voltages

194 IEC 60364-6:2016, COR1:2017, Electrical installations of buildings – Part 6: Verification

195 IEC 60664-1:2011, Ed. 2.0, Insulation coordination for equipment within low-voltage systems - Part 1:

196 Principles, requirements and tests

197 IEC 60529:1989, AMD1:1999, AMD2:2013, CSV/COR2:2015, Degrees of protection provided by

198 enclosures (IP code)

199 IEC 61010-1:2010, Ed.3.0, +AMD1:2016, Safety requirements for electrical equipment for

200 measurement, control and laboratory use – Part 1: General requirements

201 IEC 61010-031:2015, Ed.:2.0, Safety requirements for electrical equipment for measurement, control

202 and laboratory use - Part 031: Safety requirements for hand-held probe assemblies for electrical

203 measurement and test

204 IEC 61010-2-030:2017, Ed.2.0, Safety requirements for electrical equipment for measurement, control,

205 and laboratory use – Part 2-030: Particular requirements for equipment having testing or

206 measuring circuits

207 IEC 61010-2-034:2017, Ed.1.0, Safety requirements for electrical equipment for measurement, control,

208 and laboratory use - Part 2-034: Particular requirements for measurement equipment for insulation

209 resistance and test equipment for electric strength

210 IEC 61326-2-2:2012, Ed.2.0, Electrical equipment for measurement, control and laboratory use – EMC

211 requirements – Part 2-2: Particular requirements – Test configurations, operational conditions and

212 performance criteria for portable test, measuring and monitoring equipment used in low-voltage

213 distribution systems

214 IEC 61326-2-4:2012, Ed.2.0, Electrical equipment for measurement, control and laboratory use, - EMC

215 requirements - Part 2: Particular requirements – Test configurations, operational conditions and

216 performance criteria for insulation monitoring devices according to IEC 61557-8 and for equipment

217 for insulation fault location according to IEC 61557-9
218
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219 3 Terms, definitions and symbols

220 For the purposes of this document, the following terms and definitions apply.

221 ISO and IEC maintain terminological databases for use in standardization at the following addresses:

222 – IEC Electropedia: available at http://www.electropedia.org/
223 – ISO Online browsing platform: available at http://www.iso.org/obp
224 3.1
225 nominal system voltage
226 U

227 value of the voltage by which the distribution system is designated and to which certain characteristics

228 are assigned
229 3.2
230 voltage against earth
231 U

232 a) in distribution systems with an earthed neutral point, the voltage between a phase conductor and

233 the earthed neutral point;

234 b) in all other distribution systems, the voltage present between the remaining phase conductors and

235 earth when one of the phase conductors is short-circuited to earth
236 3.3
237 fault voltage
238 U

239 voltage between a given point of fault and reference earth resulting from an insulation fault

240 [SOURCE: IEV 826-11-02, modified: the symbol has been added]
241 3.4
242 (effective) touch voltage
243 U

244 voltage between conductive parts when touched simultaneously by a person or an animal

245 Note to entry: The value of the effective touch voltage may be appreciably influenced by the impedance of the person or the

246 animal in electric contact with these conductive parts.
247 [SOURCE: IEV 195-05-11 and 826-11-05]
248 3.5
249 conventional touch voltage limit
250 U

251 maximum value of the touch voltage which is permitted to be maintained indefinitely in specified

252 conditions of external influences and is usually equal to 50 V AC, r.m.s. or 120 V ripple free DC

253 [SOURCE: IEV 826-11-04, modified: ‘prospective’ has been omitted and values for the limit added]

254 3.6
255 supply voltage

256 voltage at a point where the measuring equipment does or can accept electric energy as a supply

257 Note 1 to entry: if a supply voltage is specified for instance in the supply contract, then it is called “declared supply voltage”.

258 3.7
259 rated supply voltage
260 U

261 value of the voltage at a point where the measuring equipment does or can accept electric energy as

262 a supply
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263 3.8
264 output voltage
265 U

266 voltage across the measuring equipment terminals where this equipment does or can output electric

267 energy
268 3.9
269 open-circuit voltage
270 U
271 voltage present across unloaded terminals on the measuring equipment
272 3.10
273 rated voltage (or rated voltage ranges)
274 U

275 voltage value assigned by a manufacturer or other entity for a specified operating condition of the

276 measuring equipment

277 Note 1 to entry: The value for the rated voltage of low voltage equipment is generally assigned from the list of nominal

278 voltages in Tables 1 and 6 of IEC 60038:2009.

279 Note 2 to entry: Equipment may have more than one rated voltage value or may have a rated voltage range.

280 [SOURCE: IEV 614-03-09, modified: Note 1 has been omitted, term to specifically fit measuring

281 equipment]
282 3.11
283 extraneous voltage

284 external voltage to which the measuring equipment can be subjected during measurement

285 3.12
286 rated current
287 I

288 current assigned by the manufacturer for the specified operating condition to the measuring

289 equipment

290 Note to entry: The specified operating condition is a value (or values) within the rated operating conditions that are designed

291 by the manufacturer.
292 [SOURCE: IEV 442-01-02, modified: for measuring equipment]
293 3.13
294 short-circuit current

295 over-current resulting from a short circuit due to a fault on the terminals or within the measuring

296 equipment
297 3.14
298 rated frequency
299 f

300 frequency for which the measuring equipment is intended to be used and for which it has been

301 designed
302 3.15
303 uncertainty (of measurement)

304 parameter, associated with the result of a measurement, that characterizes the dispersion of the

305 values that could reasonably be attributed to the measurand
306 Note 1 to entry: This term is used in the "uncertainty" approach.

307 Note 2 – The parameter can be, for example, a standard deviation (or a given multiple of it), or a half-width of an interval

308 having a stated level of confidence. Various ways of obtaining uncertainty are defined in the GUM.

309 Note 3 – Uncertainty of measurement comprises, in general, many components. Some of these components can be evaluated

310 from the statistical distribution of the results of a series of measurements and can be characterized by experimental standard

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311 deviations. The other components, which can also be characterized by standard deviations, are evaluated from the assumed

312 probability distributions based on experience or other information.
313 [SOURCE: IEV 311-01-02]
314 3.16
315 operating uncertainty

316 calculated uncertainty taking into account the intrinsic uncertainty and defined influence quantities to

317 mirror the worst case situation
318 3.17
319 fiducial uncertainty

320 uncertainty of measuring equipment expressed as a percentage of the fiducial value

321 3.18
322 fiducial value

323 clearly specified value to which reference is made in order to define the fiducial uncertainty

324 Note 1 to entry: This value can be, for example, the upper limit of the measuring range, the scale-length or any other value

325 which is clearly stated

326 [SOURCE: IEV 311-01-16, modified: error is replaced by uncertainty, note 1 is omitted]

327 3.19
328 percentage operating uncertainty

329 operating uncertainty of measuring equipment expressed as a percentage of the fiducial value

330 3.20
331 intrinsic uncertainty

332 uncertainty of a measuring instrument or supply instrument when used under reference conditions

333 Note 1 to entry: The uncertainty caused by friction is part of the intrinsic uncertainty.

334 [SOURCE: IEV 311-03-09, modified: the note is added]
335 3.21
336 performance

337 characteristics defining the ability of a measuring instrument to achieve the intended functions

338 [SOURCE: IEV 311-06-11]
339 3.22
340 influence quantity

341 quantity which is not the subject of the measurement and whose change affects the result of the

342 measurement
343 Note 1 – This term is used in the "uncertainty" approach.

344 Note 2 – Influence quantities can originate from the measured system, the measuring equipment or the environment.

345 Note 3 – As the calibration diagram depends on the influence quantities, in order to assign the result of a measurement it is

346 necessary to know whether the relevant influence quantities lie within the specified range.

347 Note 4 to entry: An influence quantity may be external or internal with reference to the equipment. When the value of one of

348 the influence quantities changes within its measuring range, it may affect the uncertainty due to another. The measured

349 quantity or a parameter of it may itself act as an influence quantity. For example, for a voltmeter the value of the measured

350 voltage may produce an additiona
...

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