EN IEC 61557-1:2021

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

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

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
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
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
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

– 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

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

– 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;

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.
– 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.

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.
– 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 following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
nominal system voltage
U
n
value of the voltage by which the distribution system is designated and to which certain
characteristics are assigned
3.2
voltage against earth
U
o
voltage between a phase conductor
and the earthed neutral point
3.3
voltage against earth
U
o
voltage present between the remaining phase conductors
and earth when one of the phase conductors is short-circuited to earth
3.4
fault voltage
U
f
voltage between a given point of fault and reference earth resulting from an insulation fault
[SOURCE: IEC 60050-826:2004, 826-11-02, modified – The symbol has been added.]

IEC 61557-1:2019 © IEC 2019 – 9 –
3.5
effective touch voltage
U
t
voltage between conductive parts when touched simultaneously by a person or an animal
Note 1 to entry: The value of the effective touch voltage may be appreciably influenced by the impedance of the
person or the animal in electric contact with these conductive parts.
[SOURCE: IEC 60050-195:1998, 195-05-11, modified – The symbol has been added.]
3.6
conventional touch voltage limit
U
L
maximum value of the touch voltage which is permitted to be maintained indefinitely in
specified conditions of external influences and is usually equal to 50 V AC, RMS or 120 V
ripple free DC
[SOURCE: IEC 60050-826:2004, 826-11-04, modified – "prospective" has been omitted from
the term and from the definition and values for the limit have been added to the definition; the
symbol has been added.]
3.7
supply voltage
voltage that is used to power the measurement equipment
Note 1 to entry: If a supply voltage is specified, for instance in the supply contract, then it is called "declared
supply voltage".
3.8
rated supply voltage
U
S
value of the supply voltage at a point where the measuring equipment does or can accept
electric energy as a supply
3.9
output voltage
U
a
voltage across the measuring equipment terminals where this equipment does or can output
electric energy
3.10
open-circuit voltage
U
q
voltage present across unloaded terminals on the measuring equipment
3.11
rated voltage
U
N
voltage value assigned by a manufacturer or other entity for a specified operating condition of
the measuring equipment
Note 1 to entry: The value for the rated voltage of low-voltage equipment is generally assigned from the list of
nominal voltages in IEC 60038:2009, Tables 1 and 6.
Note 2 to entry: Equipment may have more than one rated voltage value or may have a rated voltage range.
[SOURCE: IEC 60050-614:2016, 614-03-09, modified – The domain and
Note 1 have been omitted; the symbol has b
...