SIST EN 61557-9:2015

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 9: Equipment for insulation fault location in IT systems (IEC 61557-9:2014)

This part of IEC 61557 specifies the requirements for the insulation fault location system
(IFLS) which localizes insulation faults in any part of the system in unearthed IT a.c. systems
and unearthed IT a.c. systems with galvanically connected d.c. circuits having nominal
voltages up to 1 000 V a.c., as well as in unearthed IT d.c. systems with voltages up to
1 500 V d.c., independent of the measuring principle.
IT systems are described in IEC 60364-4-41 amongst other literature. Additional data for a
selection of devices in other standards should be noted.
NOTE Further information on insulation fault location can be found in the following standards:
IEC 60364-4-41:2005, 411.6, and IEC 60364-5-53:2001, 531.3.

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 61557-9:2014)

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 61557-9:2014)

L'IEC 61557-9:2014 spécifie les exigences applicables aux dispositifs de localisation de défauts d'isolement (DLD) qui, indépendamment du principe de mesure, peuvent localiser les défauts d'isolement des parties de réseaux IT à courant alternatif non mis à la terre et des réseaux IT à courant alternatif non mis à la terre comprenant des circuits à courant continu reliés galvaniquement dont les tensions nominales sont au plus égales à 1 000 V en courant alternatif, et de réseaux IT à courant continu non mis à la terre dont les tensions sont au plus égales à 1 500 V en courant continu. Les réseaux IT sont décrits entre autres dans l'IEC 60364-4-41. Il convient de noter que, pour le choix des appareils, des indications supplémentaires sont données dans d'autres normes. Cette troisième édition annule et remplace la deuxième édition parue en 2009. Elle constitue une révision technique qui inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le domaine d'application, les références normatives, les termes et définitions ont été complétés;
- énumération et explication des abréviations;
- les exigences de marquage, les instructions de fonctionnement ont été révisées;
- définition des fonctions obligatoires et facultatives et adaptation de leur terminologie à l'IEC 61557-15;
- ajout d'exigences mécaniques;
- l'Article 6 "Essais" a été révisé;
- et des nouveaux Tableaux ont été ajoutés.

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 - 9. del: Oprema za ugotavljanje mesta izolacijske okvare v IT-sistemih (IEC 61557-9:2014)

Ta del standarda IEC 61557 določa zahteve za sistem za ugotavljanje mesta izolacijske okvare (IFLS), ki ugotovi mesto izolacijskih okvar v katerem koli delu sistema pri neozemljenih IT sistemih na izmenični tok, neozemljenih IT-sistemih na izmenični tok z galvansko povezanimi tokokrogi enosmernega toka z nominalnimi vrednostmi izmenične napetosti do 1000 V ter neozemljenih IT-sistemih na enosmerni tok z vrednostmi enosmerne napetosti do 1500 V, neodvisno od principa merjenja.
IT-sistemi so med drugim opisani tudi v standardu IEC 60364-4-41. Upoštevali naj bi dodatne podatke za izbiro naprav v drugih standardih.
OPOMBA: več informacij o ugotavljanju mesta izolacijske okvare je mogoče najti v teh standardih: IEC 60364-4-41:2005, 411.6 in IEC 60364-5-53:2001, 531.3.

General Information

• Status: Published
• Publication Date: 18-May-2015
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.080.01 - Electrical insulation in general
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-Feb-2015
• Due Date: 02-May-2015
• Completion Date: 19-May-2015
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Ref Project: EN 61557-9:2015 - 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 9: Equipment for insulation fault location in IT systems

Relations

• Corrected By: SIST EN 61557-9:2015/AC:2016 - 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 9: Equipment for insulation fault location in IT systems
• Effective Date: 31-May-2016
• Corrected By: SIST EN 61557-9:2015/AC:2017 - 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 9: Equipment for insulation fault location in IT systems (IEC 61557-9:2014/COR2:2017)
• Effective Date: 31-Jan-2017
• Replaces: SIST EN 61557-9:2009 - 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
• Effective Date: 28-Jan-2023
• Revised: oSIST prEN IEC 61557-9:2022 - 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 9: Equipment for insulation fault location in IT systems
• Effective Date: 18-May-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61557-9:2015
01-junij-2015
(OHNWULþQDYDUQRVWYQL]NRQDSHWRVWQLKUD]GHOLOQLKVLVWHPLK]DL]PHQLþQHQDSHWRVWL
GRN9LQHQRVPHUQHQDSHWRVWLGRN92SUHPD]DSUHVNXãDQMHPHUMHQMHDOL
QDG]RURYDQMH]DãþLWQLKXNUHSRYGHO2SUHPD]DXJRWDYOMDQMHPHVWDL]RODFLMVNH
RNYDUHY,7VLVWHPLK,(&
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 9:
Equipment for insulation fault location in IT systems (IEC 61557-9:2014)
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 61557-9:2014)
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 61557-9:2014)
Ta slovenski standard je istoveten z: EN 61557-9:2015
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
SIST EN 61557-9:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61557-9:2015

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SIST EN 61557-9:2015


EUROPEAN STANDARD EN 61557-9

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2015
ICS 25.040.40 Supersedes EN 61557-9:2009
English Version
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 9: Equipment for
insulation fault location in IT systems
(IEC 61557-9:2014)
Sécurité électrique dans les réseaux de distribution basse Elektrische Sicherheit in Niederspannungsnetzen bis AC 1
tension de 1 000 V c.a. et 1 500 V c.c - Dispositifs de 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder
contrôle, de mesure ou de surveillance de mesures de Überwachen von Schutzmaßnahmen - Teil 9: Einrichtungen
protection - Partie 9: Dispositifs de localisation de défauts zur Isolationsfehlersuche in IT-Systemen
d'isolement pour réseaux IT (IEC 61557-9:2014)
(IEC 61557-9:2014)
This European Standard was approved by CENELEC on 2015-01-15. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61557-9:2015 E

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SIST EN 61557-9:2015
EN 61557-9:2015 - 2 -

Foreword
The text of document 85/486/FDIS, future edition 3 of IEC 61557-9, 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 61557-9:2015.

The following dates are fixed:
(dop) 2015-10-15
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-01-15
standards conflicting with the
document have to be withdrawn

This document supersedes EN 61557-9:2009

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for
Use within Certain Voltage Limits (LVD).

Endorsement notice
The text of the International Standard IEC 61557-9:2014 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 60364-4-41:2005 NOTE Harmonized as HD 60364-4-41:2007.
IEC 60664-1 NOTE Harmonized as EN 60664-1.
IEC 60664-3 NOTE Harmonized as EN 60664-3.
IEC 60947-5-1:2003 NOTE Harmonized as EN 60947-5-1:2004.
IEC 60947-5-4:2002 NOTE Harmonized as EN 60947-5-4:2003.
IEC 61140 NOTE Harmonized as EN 61140.
IEC 61810-2:2011 NOTE Harmonized as EN 61810-2:2011.

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SIST EN 61557-9:2015
- 3 - EN 61557-9:2015

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60068-2-1 -  Environmental testing -- Part 2-1: Tests - Test EN 60068-2-1 -
A: Cold
IEC 60068-2-2 -  Environmental testing -- Part 2-2: Tests - Test EN 60068-2-2 -
B: Dry heat
IEC 60068-2-6 -  Environmental testing -- Part 2-6: Tests - Test EN 60068-2-6 -
Fc: Vibration (sinusoidal)
IEC 60068-2-27 -  Environmental testing -- Part 2-27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
IEC 60364-7-710 2002 Electrical installations of buildings -- Part 7- HD 60364-7-710 2012
(mod) 710: Requirements for special installations or
locations - Medical locations
  +AC 2013
IEC 60529 -  Degrees of protection provided by enclosures - -
(IP Code)
IEC 60664 series Insulation coordination for equipment within EN 60664 series
low-voltage systems
IEC 60721-3-1 -  Classification of environmental conditions -- EN 60721-3-1 -
Part 3: Classification of groups of
environmental parameters and their severities
-- Section 1: Storage
IEC 60721-3-2 -  Classification of environmental conditions -- EN 60721-3-2 -
Part 3: Classification of groups of
environmental parameters and their severities
-- Section 2: Transportation
IEC 60721-3-3 -  Classification of environmental conditions -- EN 60721-3-3 -
Part 3: Classification of groups of
environmental parameters and their severities
-- Section 3: Stationary use at
weatherprotected locations
IEC 61010-1 2010 Safety requirements for electrical equipment EN 61010-1 2010
for measurement, control and laboratory use -
- Part 1: General requirements
IEC 61010-2-030 -  Safety requirements for electrical equipment EN 61010-2-030 -
for measurement, control and laboratory use -
- Part 2-030: Particular requirements for
testing and measuring circuits
IEC 61010-2-032 -  Safety requirements for electrical equipment EN 61010-2-032 -
for measurement, control, and laboratory use
-- Part 2-032: Particular requirements for
hand-held and hand-manipulated current
sensors for electrical test and measurement

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SIST EN 61557-9:2015
EN 61557-9:2015 - 4 -
IEC 61010-031 -  Safety requirements for electrical equipment EN 61010-031 -
for measurement, control and laboratory use -
- Part 031: Safety requirements for hand-held
probe assemblies for electrical measurement
and test
IEC 61326-2-2 -  Electrical equipment for measurement, control EN 61326-2-2 -
and laboratory use - EMC requirements --
Part 2-2: Particular requirements - Test
configurations, operational conditions and
performance criteria for portable test,
measuring and monitoring equipment used in
low-voltage distribution systems
IEC 61326-2-4 -  Electrical equipment for measurement, control EN 61326-2-4 -
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
IEC 61557-1 2007 Electrical safety in low voltage distribution EN 61557-1 2007
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
IEC 61557-8 -  Electrical safety in low voltage distribution EN 61557-8 -
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
CISPR 11 -  Industrial, scientific and medical equipment - EN 55011 -
Radio-frequency disturbance characteristics -
Limits and methods of measurement

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SIST EN 61557-9:2015



IEC 61557-9

®


Edition 3.0 2014-12




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 9: Equipment for insulation fault location in IT systems



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










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX U


ICS 25.040.40 ISBN 978-2-8322-1976-8



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

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SIST EN 61557-9:2015
– 2 – IEC 61557-9:2014 © IEC 2014
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 8
3.1 Terms, definitions, symbols and units . 8
3.2 Abbreviations . 10
4 Requirements . 10
4.1 General requirements . 10
4.2 Mandatory functions provided by an IFLS . 11
4.2.1 Location warning . 11
4.2.2 Local location warning (LLW) . 11
4.2.3 Remote location warning (RLW). 11
4.3 Optional functions provided by IFLS . 12
4.3.1 Indication of the insulation value . 12
4.3.2 Performance of the IFLS in case of the interruption of the connection to
the locating current sensor (LCS) . 12
4.4 Performance requirements . 12
4.4.1 Response sensitivity . 12
4.4.2 Locating current I . 12
L
4.4.3 Locating voltage U . 12
L
4.5 Electromagnetic compatibility (EMC) . 12
4.6 Safety requirements . 12
4.6.1 General . 12
4.6.2 Clearances and creepage distances . 12
4.6.3 Protection class and earth connection of the IFLS . 13
4.7 Climatic environmental conditions . 13
4.8 Mechanical requirements . 13
4.8.1 General . 13
4.8.2 Product mechanical robustness . 13
4.8.3 IP protection class requirements . 14
5 Marking and operating instructions . 15
5.1 Marking . 15
5.2 Operating instructions . 15
6 Tests . 16
6.1 General . 16
6.2 Type tests . 16
6.2.1 General . 16
6.2.2 Test of response sensitivity of the IFLS . 16
6.2.3 Test of the locating current I . 17
L
6.2.4 Test of the locating voltage U . 17
L
6.2.5 Test of the location warning . 17
6.2.6 Test of the indication of the insulation value . 17
6.2.7 Test of the performance of the LCI . 17
6.2.8 Voltage test . 17
6.2.9 Test of the electromagnetic compatibility (EMC) . 18
6.2.10 Test of the loss of LCS connection . 18

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SIST EN 61557-9:2015
IEC 61557-9:2014 © IEC 2014 – 3 –
6.2.11 Test of the protection class and the earth connection of the IFLS . 18
6.2.12 Inspection of the marking and operating instructions . 18
6.2.13 Mechanical test . 18
6.2.14 Record of the type test . 18
6.3 Routine tests. 18
6.3.1 General . 18
6.3.2 Test of the response sensitivity. 18
6.3.3 Test of the location warning . 19
6.3.4 Test of the self-test function . 19
6.3.5 Voltage test . 19
6.3.6 Compliance with the tests of Clause 6 . 19
7 Overview of requirements and tests for IFLSs . 19
Annex A (normative) Equipment for insulation fault location in medical locations . 20
A.1 Scope . 20
A.2 Requirements . 20
A.2.1 General . 20
A.2.2 Performance requirements . 20
A.2.3 Electromagnetic compatibility (EMC) . 20
A.3 Marking and operating instructions . 20
A.4 Tests . 21
A.4.1 General . 21
A.4.2 Type tests . 21
Annex B (normative) Portable equipment for insulation fault location . 22
B.1 Scope . 22
B.2 Requirements . 22
B.2.1 General . 22
B.2.2 Performance requirements . 22
B.3 Marking and operating instructions . 22
B.4 Tests . 22
Annex C (informative) Example of an IFLS and explanation of upstream and
downstream system leakage capacitances . 24
C.1 Examples of an IFLS . 24
C.2 Upstream and downstream system leakage capacitance . 26
Bibliography . 27

Figure C.1 – Example of an IFLS . 25
Figure C.2 – Explanation of upstream and downstream system leakage capacitance . 26

Table 1 – Abbreviations . 10
Table 2 – Product mechanical requirements . 14
Table 3 – Minimum IP requirements for IFLS . 15
Table 4 – Reference conditions for tests in operation . 16
Table 5 – Reference conditions for storage tests . 16
Table 6 – Requirements and tests on IFLSs . 19

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SIST EN 61557-9:2015
– 4 – IEC 61557-9:2014 © IEC 2014
Table A.1 – Additional requirements applicable to equipment for insulation fault
location in medical locations . 21
Table A.2 – Emission test for equipment for insulation fault location in medical
locations . 21

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SIST EN 61557-9:2015
IEC 61557-9:2014 © IEC 2014 – 5 –
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 9: Equipment for insulation fault location in IT systems

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 61557-9 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This third edition cancels and replaces the second edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the scope, normative references, terms and definitions have been complemented;
b) abbreviations are listed and explained;
c) requirements, marking and operating instructions have been revised;
d) mandatory and optional functions have been defined and their terminology has been
adapted to IEC 61557-15;

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SIST EN 61557-9:2015
– 6 – IEC 61557-9:2014 © IEC 2014
e) mechanical requirements have been added;
f) Clause 6 “Tests” has been revised;
g) new Tables have been added.
The text of this standard is based on the following documents:
FDIS Report on voting
85/486/FDIS 85/503/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part of IEC 61557 shall be used in conjunction with Part 1.
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 a.c. and 1 500 V d.c. – 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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN 61557-9:2015
IEC 61557-9:2014 © IEC 2014 – 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 9: Equipment for insulation fault location in IT systems




1 Scope
This part of IEC 61557 specifies the requirements for the insulation fault location system
(IFLS) which localizes insulation faults in any part of the system in unearthed IT a.c. systems
and unearthed IT a.c. systems with galvanically connected d.c. circuits having nominal
voltages up to 1 000 V a.c., as well as in unearthed IT d.c. systems with voltages up to
1 500 V d.c., independent of the measuring principle.
IT systems are described in IEC 60364-4-41 amongst other literature. Additional data for a
selection of devices in other standards should be noted.
NOTE Further information on insulation fault location can be found in the following standards:
IEC 60364-4-41:2005, 411.6, and IEC 60364-5-53:2001, 531.3.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Envir
...