SIST EN IEC 61557-16:2025

SLOVENSKI STANDARD
01-marec-2025
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 - 16. del: Oprema za preskušanje učinkovitosti
zaščitnih ukrepov električne opreme oziroma medicinske električne opreme (IEC
61557-16:2023)
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 16:
Equipment for testing the effectiveness of the protective measures of electrical
equipment and/or medical electrical equipment (IEC 61557-16:2023)
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 16: Geräte
zur Prüfung der Wirksamkeit der Schutzmaßnahmen von elektrischen Geräten und/oder
medizinisch elektrischen Geräten(IEC 61557-16:2023)
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 16: Équipement pour les essais de bon fonctionnement des mesures
de protection de l'équipement électrique et/ou de l'équipement médical électrique (IEC
61557-16:2023)
Ta slovenski standard je istoveten z: EN IEC 61557-16:2024
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61557-16

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2024
ICS 17.220.20; 29.080.01 Supersedes EN 61557-16:2015
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 16: Equipment for
testing the effectiveness of the protective measures of electrical
equipment and/or medical electrical equipment
(IEC 61557-16:2023)
Sécurité électrique dans les réseaux de distribution basse Elektrische Sicherheit in Niederspannungsnetzen bis AC 1
tension au plus égale à 1 000 V en courant alternatif et 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder
500 V en courant continu - Dispositifs de contrôle, de Überwachen von Schutzmaßnahmen - Teil 16: Geräte zur
mesure ou de surveillance de mesures de protection - Prüfung der Wirksamkeit der Schutzmaßnahmen von
Partie 16: Équipement pour les essais de bon elektrischen Geräten und/oder medizinisch elektrischen
fonctionnement des mesures de protection des appareils Geräten
électriques et/ou des appareils électromédicaux (IEC 61557-16:2023)
(IEC 61557-16:2023)
This European Standard was approved by CENELEC on 2024-10-16. 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61557-16:2024 E

European foreword
The text of document 85/876/FDIS, future edition 2 of IEC 61557-16, prepared by TC 85 "Measuring
equipment for electrical and electromagnetic quantities" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN IEC 61557-16:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-12-31
document have to be withdrawn
This document supersedes EN 61557-16:2015 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 is read in conjunction with EN IEC 61557-1:2021.
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 61557-16:2023 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 standard indicated:
IEC 60990 NOTE Approved as EN 60990
IEC 61000-4-8 NOTE Approved as EN 61000-4-8
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60601-1 2005 Medical electrical equipment - Part 1: EN 60601-1 2006
General requirements for basic safety and
essential performance
- - +AC 2010
+ A1 2012 + A1 2013
- - + AC 2014
- - + A12 2014
+ A2 2020 + A2 2021
- - + AC 2022
- - + A13 2024
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
- - + AC 2019
IEC 61010-031 - Safety requirements for electrical EN IEC 61010-031 -
equipment for measurement, control, and
laboratory use - Part 031: Safety
requirements for hand-held and hand-
manipulated probe assemblies for
electrical test and measurement
IEC 61010-2-030 - Safety requirements for electrical EN IEC 61010-2- -
equipment for measurement, control, and 030
laboratory use - Part 2-030: Particular
requirements for equipment having testing
or measuring circuits
Publication Year Title EN/HD Year
IEC 61010-2-032 - Safety requirements for electrical EN 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
IEC 61010-2-034 - Safety requirements for electrical EN 61010-2-034 -
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 61557-1 2019 Electrical safety in low voltage distribution EN IEC 61557-1 2021
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 61557-2 - Electrical safety in low voltage distribution EN IEC 61557-2 -
systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures - Part 2:
Insulation resistance
IEC 61557-4 - Electrical safety in low voltage distribution EN IEC 61557-4 -
systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures - Part 4:
Resistance of earth connection and
equipotential bonding
IEC 61557-10 - Electrical safety in low voltage distribution EN IEC 61557-10 -
systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures - Part
10: Combined measuring equipment
IEC 61557-13 - Electrical safety in low voltage distribution EN IEC 61557-13 -
systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures - Part
13: Hand-held and hand-manipulated
current clamps and sensors for
measurement of leakage currents in
electrical distribution systems
IEC 62353 2014 Medical electrical equipment - Recurrent EN 62353 2014
test and test after repair of medical
electrical equipment
IEC 61557-16 ®
Edition 2.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 16: Equipment for testing the effectiveness of the protective measures of

electrical equipment and/or medical electrical equipment

Sécurité électrique dans les réseaux de distribution basse tension au plus

égale à 1 000 V en courant alternatif et 1 500 V en courant continu – Dispositifs

de contrôle, de mesure ou de surveillance de mesures de protection –

Partie 16: Équipement pour les essais de bon fonctionnement des mesures de

protection des appareils électriques et/ou des appareils électromédicaux

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20, 29.080.01 ISBN 978-2-8322-7251-0

– 2 – IEC 61557-16:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 9
4.1 General requirements . 9
4.2 Measuring functions . 9
4.2.1 Minimum measuring function requirements . 9
4.2.2 Measurement of the resistance of the protective bonding or the
protective earth resistance . 10
4.2.3 Measurement of insulation resistance . 10
4.2.4 Measurement of protective conductor current or equipment leakage
current with the alternative method . 11
4.2.5 Measurement of touch current, patient leakage current and applied part
leakage current with the alternative method . 11
4.2.6 Measurement of protective conductor current and equipment leakage
current with the direct or differential (residual) method . 12
4.2.7 Measurement of touch current, patient leakage current and applied part
leakage current with the direct or differential (residual) method . 13
4.3 Construction requirements . 13
4.3.1 Overvoltage capability . 13
4.3.2 Terminals . 13
4.3.3 Sockets for service purpose . 14
4.3.4 Degree of protection . 14
4.3.5 Class of protection . 14
4.3.6 Overvoltage and measurement categories . 14
4.3.7 Accessories . 14
5 Markings and operating instructions . 15
5.1 Markings . 15
5.2 Operating instructions . 15
6 Tests . 15
6.1 General . 15
6.2 Operating uncertainty . 15
6.3 Tests of measuring circuits according to measuring functions . 18
6.4 Test of construction requirements of test and measurement equipment . 18
Annex A (normative) Measuring circuit MD . 19
A.1 Current measuring circuit MD . 19
A.2 Frequency characteristic of current measuring circuit MD . 20
Bibliography . 21

Figure A.1 – Current measuring circuit MD . 19
Figure A.2 – Frequency characteristic of the current measuring circuit MD . 20

IEC 61557-16:2023 © IEC 2023 – 3 –
Table 1 – Calculation of operating uncertainty for leakage measurements with direct or
differential method . 17
Table 2 – Compliance tests of measuring circuits according to measuring function . 18
Table 3 – Compliance test of construction requirements of test and measuring
equipment . 18

– 4 – IEC 61557-16:2023 © IEC 2023
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 16: Equipment for testing the effectiveness of the protective
measures of electrical equipment and/or medical electrical equipment

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 61557-16 has been prepared by IEC technical committee 85: Measuring equipment for
electrical and electromagnetic quantities. It is an International Standard.
This second edition cancels and replaces the first edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) splitting of uncertainty requirements for medical and non-medical electrical equipment in
4.2.1;
b) addition of a definition of ranges with defined uncertainty in 4.2.1 to 4.2.7;
c) addition of an optional measuring device (MD) for non-medical devices in 4.2.1;

IEC 61557-16:2023 © IEC 2023 – 5 –
d) addition of a limitation of the maximum intrinsic uncertainty for medical applications at
leakage current in 4.2.1;
e) change of 4.2.3 from test sockets to sockets for service purposes;
f) addition of a warning in the operating instructions;
g) integration of former 6.3 into 6.2;
h) update of Table 1;
i) alignment of the structure with that of the whole IEC 61557 series.
The text of this International Standard is based on the following documents:
Draft Report on voting
85/876/FDIS 85/885/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 61557-1:2019.
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 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 61557-16:2023 © IEC 2023
INTRODUCTION
This part of IEC 61557 defines performance requirements of measuring equipment intended for
testing the effectiveness of the protective measures of either electrical equipment or medical
electrical equipment, or both (in accordance with IEC 62353). It is the intention of this document
to achieve comparable measuring results, additional safety for the person carrying out the
testing, and non-damaging electrical stress for the unit under test.

IEC 61557-16:2023 © IEC 2023 – 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 16: Equipment for testing the effectiveness of the protective
measures of electrical equipment and/or medical electrical equipment

1 Scope
This part of IEC 61557 specifies the requirements applicable to the performance for test and
measurement equipment in order to determine the effectiveness of the protective measures for
electrical equipment and/or medical electrical equipment described in IEC 62353.
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 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60601-1:2005, Medical electrical equipment – Part 1: General requirements for basic safety
and essential performance
IEC 60601-1:2005/AMD1:2012
IEC 60601-1:2005/AMD2:2020
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 probe
assemblies for electrical test and measurement
IEC 61010-2-030, 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, 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 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
– 8 – IEC 61557-16:2023 © IEC 2023
IEC 61557-2, 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 2:
Insulation resistance
IEC 61557-4, 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 4:
Resistance of earth connection and equipotential bonding
IEC 61557-10, 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 10:
Combined measuring equipment for testing, measuring or monitoring of protective measures
IEC 61557-13, 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 13:
Hand-held and hand-manipulated current clamps and sensors for measurement of leakage
currents in electrical distribution systems
IEC 62353:2014, Medical electrical equipment – Recurrent test and test after repair of medical
electrical equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61557-1, IEC 61557-2,
IEC 61557-4, IEC 61557-10 and IEC 61557-13, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
test socket outlet
socket outlet on the test equipment that can be switched to either test-condition or supply
condition
3.2
service socket
socket outlet on the test equipment to supply mains to further test equipment or additional
equipment
3.3
measuring circuit MD
electric circuit with defined components and defined frequency characteristic
3.4
peak factor
ratio of the maxi
...