SIST EN IEC 61557-9:2025

SLOVENSKI STANDARD
01-julij-2025
Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti
do 1 000 V in enosmerne napetosti do 1 500 V - Oprema za preskušanje, merjenje
ali nadzorovanje zaščitnih ukrepov - 9. del: Oprema za ugotavljanje mesta
izolacijske okvare v IT-sistemih (IEC 61557-9:2023)
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 9:
Equipment for insulation fault location in IT systems (IEC 61557-9:2023)
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V –
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen – Teil 9:
Einrichtungen zur Isolationsfehlersuche in IT-Systemen (IEC 61557-9:2023)
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 9: Dispositifs de localisation de défauts d'isolement pour réseaux IT
(IEC 61557-9:2023)
Ta slovenski standard je istoveten z: EN IEC 61557-9:2025
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 61557-9

NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 25.040.40 Supersedes EN 61557-9:2015; EN 61557-
9:2015/AC:2016-06; EN 61557-9:2015/AC:2017-02
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 9: Equipment for
insulation fault location in IT systems
(IEC 61557-9:2023)
Sécurité électrique dans les réseaux de distribution basse Elektrische Sicherheit in Niederspannungsnetzen bis AC
tension au plus égale à 1 000 V en C.A et 1 500 V en C.C - 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder
Dispositifs de contrôle, de mesure ou de surveillance de Überwachen von Schutzmaßnahmen - Teil 9: Einrichtungen
mesures de protection - Partie 9: Dispositifs de localisation zur Isolationsfehlersuche in IT-Systemen
de défauts d'isolement pour réseaux IT (IEC 61557-9:2023)
(IEC 61557-9:2023)
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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61557-9:2025 E

European foreword
The text of document 85/896/FDIS, future edition 4 of IEC 61557-9, 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 61557-9:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-04-30
document have to be withdrawn
This document supersedes EN 61557-9:2015 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.
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 61557-9:2023 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 60364-4-41:2005 NOTE Approved as HD 60364-4-41:2017 +A11:2017
IEC 60664 series NOTE Approved as EN 60664 series
IEC 60664-1 NOTE Approved as EN IEC 60664-1
IEC 60664-3 NOTE Approved as EN 60664-3
IEC 61557-15 NOTE Approved as EN 61557-15
IEC 61810-2:2017 NOTE Approved as EN 61810-2:2017 (not modified)
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 60068-2-1 2007 Environmental testing - Part 2-1: Tests - EN 60068-2-1 2007
Test A: Cold
IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - EN 60068-2-2 2007
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - EN 60068-2-27 2009
Test Ea and guidance: Shock
IEC 60364-7-710 2021 Low-voltage electrical installations - Part 7- HD 60364-7-710 2024
710: Requirements for special installations
or locations - Medical locations
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60721-3-1 2018 Classification of environmental conditions - EN IEC 60721-3-1 2018
Part 3-1: Classification of groups of
environmental parameters and their
severities - Storage
IEC 60721-3-2 2018 Classification of environmental conditions - EN IEC 60721-3-2 2018
Part 3-2: Classification of groups of
environmental parameters and their
severities - Transportation and Handling
IEC 60721-3-3 2019 Classification of environmental conditions - EN IEC 60721-3-3 2019
Part 3-3: Classification of groups of
environmental parameters and their
severities - Stationary use at
weatherprotected locations
IEC 60947-5-1 2016 Low-voltage switchgear and controlgear - EN 60947-5-1 2017
Part 5-1: Control circuit devices and
switching elements - Electromechanical
control circuit devices
Publication Year Title EN/HD Year
IEC 60947-5-4 2002 Low-voltage switchgear and controlgear - EN 60947-5-4 2003
Part 5-4: Control circuit devices and
switching elements - Method of assessing
the performance of low-energy contacts -
Special tests
+ A1 2019 + A1 2019
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 61010-2-030 - 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
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 61010-2-032 - Safety requirements for electrical EN IEC 61010-2- -
equipment for measurement, control, and 032
laboratory use - Part 2-032: Particular
requirements for hand-held and hand-
manipulated current sensors for electrical
test and measurement
IEC 61140 - Protection against electric shock - EN 61140 -
Common aspects for installation and
equipment
IEC 61326-1 2020 Electrical equipment for measurement, EN IEC 61326-1 2021
control and laboratory use - EMC
requirements - Part 1: General
requirements
IEC 61326-2-2 - Electrical equipment for measurement, EN IEC 61326-2-2 -
control and laboratory use - EMC
requirements - Part 2-2: Particular
requirements - Test configurations,
operational conditions and performance
criteria for portable testing, measuring and
monitoring equipment used in low-voltage
distribution systems
IEC 61326-2-4 - Electrical equipment for measurement, EN IEC 61326-2-4 -
control and laboratory use - EMC
requirements - Part 2-4: Particular
requirements - Test configurations,
operational conditions and performance
criteria for insulation monitoring devices
according to IEC 61557-8 and for
equipment for insulation fault location
according to IEC 61557-9
Publication Year Title EN/HD Year
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 61557-8 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 61810-2 2017 Electromechanical elementary relays - Part EN 61810-2 2017
2: Reliability
IEC 61557-9 ®
Edition 4.0 2023-12
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 9: Equipment for insulation fault location in IT systems

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 9: Dispositifs de localisation de défauts d'isolement pour réseaux IT

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40  ISBN 978-2-8322-7836-9

– 2 – IEC 61557-9:2023 © IEC 2023
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 9
3.1 Terms, definitions, symbols and units . 9
3.2 Abbreviated terms and symbols . 12
4 Requirements . 13
4.1 General requirements . 13
4.2 Functions provided by an IFLS . 14
4.2.1 Location warning . 14
4.2.2 Local location warning (LLW) . 14
4.2.3 Remote location warning (RLW). 14
4.3 Optional functions provided by IFLS . 14
4.3.1 Indication of the insulation value . 14
4.3.2 Alarm in case of the interruption of the loss of the connection to the
locating current sensor (LCS) . 14
4.3.3 Self-test . 14
4.4 Performance requirements . 15
4.4.1 Response sensitivity .
...