SLOVENSKI STANDARD
oSIST prEN IEC 61557-9:2022
01-julij-2022
Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti
do 1 000 kV in enosmerne napetosti do 1 500 kV - Oprema za preskušanje,
merjenje ali nadzorovanje zaščitnih ukrepov - 9. del: Oprema za ugotavljanje
mesta izolacijske okvare v IT-sistemih
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
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
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
Ta slovenski standard je istoveten z: prEN IEC 61557-9:2022
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
oSIST prEN IEC 61557-9:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61557-9:2022

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oSIST prEN IEC 61557-9:2022
85/829/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61557-9 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-06-03 2022-08-26
SUPERSEDES DOCUMENTS:
85/783/CD, 85/800A/CC

IEC TC 85 : MEASURING EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES
SECRETARIAT: SECRETARY:
China Ms Guiju HAN
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 64
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 9: Equipment for
insulation fault location in IT systems

PROPOSED STABILITY DATE: 2028

NOTE FROM TC/SC OFFICERS:

Copyright © 2022 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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oSIST prEN IEC 61557-9:2022
IEC CDV 61557-9 © IEC 2022 2 85/829/CDV
1 CONTENTS
2 CONTENTS . 1
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms, definitions and abbreviations . 7
7 3.1 Terms, definitions, symbols and units . 7
8 3.2 Abbreviated terms and symbols . 10
9 4 Requirements . 13
10 4.1 General requirements . 13
11 4.2 Functions provided by an IFLS . 13
12 4.2.1 Location warning . 13
13 4.2.2 Local location warning (LLW) . 13
14 4.2.3 Remote location warning (RLW). 13
15 4.3 Optional functions provided by IFLS . 14
16 4.3.1 Indication of the insulation value . 14
17 4.3.2 Performance of the IFLS in case of the interruption of the connection to
18 the locating current sensor (LCS) . 14
19 4.4 Performance requirements . 14
20 4.4.1 Response sensitivity . 14
21 4.4.2 Locating current I and locating voltage U . 14
L L
22 4.4.3 Permanently admissible nominal voltage U . 15
pa
23 4.4.4 Supply voltage U . 15
s
24 4.5 Safety requirements . 15
25 4.5.1 General . 15
26 4.5.2 Clearance and creepage distances . 15
27 4.5.3 Protection class and earth connection of the IFLS . 16
28 4.6 Electromagnetic compatibility . 16
29 4.7 Mechanical requirements . 16
30 4.7.1 General . 16
31 4.7.2 Product mechanical robustness . 16
32 4.7.3 IP protection class requirements . 16
33 4.8 Climatic environmental conditions . 16
34 5 Marking and operating instructions . 18
35 5.1 Marking . 18
36 5.2 Operating instructions . 18
37 6 Tests . 19
38 6.1 General . 19
39 6.2 Type tests . 19
40 6.2.1 General . 19
41 6.2.2 Test of response sensitivity of the IFLS . 19
42 6.2.3 Test of the locating current I and locating voltage U . 20
L L
43 6.2.4 Test of the location warning . 23
44 6.2.5 Test of the indication of the insulation value . 23
45 6.2.6 Verification of insulation coordination . 23
46 6.2.7 Test of the electromagnetic compatibility (EMC) . 23
47 6.2.8 Test of the loss of LCS connection . 23
48 6.2.9 Test of the protection class and the earth connection of the IFLS . 23
49 6.2.10 Inspection of the marking and operating instructions . 23

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50 6.2.11 Mechanical test . 23
51 6.2.12 Record of the type test . 23
52 6.3 Routine tests. 23
53 6.3.1 General . 23
54 6.3.2 Test of the response sensitivity. 23
55 6.3.3 Test of the location warning . 24
56 6.3.4 Test of the self-test function . 24
57 6.3.5 Voltage test . 24
58 6.3.6 Compliance with the tests of Clause 6 . 24
59 7 Overview of requirements and tests for IFLS . 24
60 Annex A (normative) Insulation fault location system in medical locations (MED-IFLS) . 25
61 A.1 General . 25
62 A.2 Requirements . 25
63 A.2.1 General . 25
64 A.2.2 Performance requirements . 25
65 A.2.3 Electromagnetic compatibility . 25
66 A.3 Additional tests . 26
67 A.3.1 General . 26
68 A.3.2 Test of the performance requirements . 26
69 A.3.3 Test of the response time . 26
70 A.3.4 Test of the electromagnetic compatibility (EMC) . 26
71 Annex B (normative) Portable equipment for insulation fault location . 28
72 B.1 General . 28
73 B.2 Additional requirements . 28
74 B.2.1 General . 28
75 B.2.2 Performance requirements . 28
76 B.3 Marking and operating instructions . 28
77 B.4 Additional tests . 28
78 Annex C (informative) Example of an IFLS and explanation of upstream and
79 downstream system leakage capacitances . 29
80 C.1 Examples for the functions of an IFLS . 29
81 C.2 Upstream and downstream system leakage capacitance . 31
82 Bibliography . 32
83
84 Figure 1 – Test configuration: I driven directly from the system to be monitored . 21
L
85 Figure 2 – Test configuration: Active locating source . 22
86 Figure 3 – Test configuration for current testing: Active locating source is used with a
87 locating voltage above 50 V AC RMS and 70 V peak or 120 V DC . 22

88 Figure C.1 – Example of an IFLS . 30
89 Figure C.2 – Explanation of upstream and downstream system leakage capacitance . 31
90
91 Table 1 – Abbreviations and symbols . 10
92 Table 2 – Product mechanical requirements . 17
93 Table 3 – Minimum IP requirements for IFLS . 18
94 Table 4 – Reference conditions for tests in operation . 19
95 Table 5 – Reference conditions for storage tests . 19
96 Table 6 – Requirements and tests on IFLSs . 24
97 Table A.1 – Additional requirements applicable to MED-IFLS . 26
98 Table A.2 – Emission test for MED-IFLS . 26

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99
100
101 INTERNATIONAL ELECTROTECHNICAL COMMISSION
102 ____________
103 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP
104 TO 1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING
105 OR MONITORING OF PROTECTIVE MEASURES –
106
107 Part 9: Equipment for insulation fault location in IT systems
108
109 FOREWORD
110 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
111 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
112 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
113 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
114 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
115 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
116 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
117 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
118 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
119 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
120 consensus of opinion on the relevant subjects since each technical committee has representation from all
121 interested IEC National Committees.
122 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
123 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
124 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
125 misinterpretation by any end user.
126 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
127 transparently to the maximum extent possible in their national and regional publications. Any divergence between
128 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
129 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
130 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
131 services carried out by independent certification bodies.
132 6) All users should ensure that they have the latest edition of this publication.
133 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
134 members of its technical committees and IEC National Committees for any personal injury, property damage or
135 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
136 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
137 Publications.
138 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
139 indispensable for the correct application of this publication.
140 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
141 rights. IEC shall not be held responsible for identifying any or all such patent rights.
142 IEC 61557-9 has been prepared by IEC technical committee 85: Measuring equipment for
143 electrical and electromagnetic quantities. It is an International Standard.
144 This fourth edition cancels and replaces the third edition published in 2014. This edition
145 constitutes a technical revision.
146 This edition includes the following significant technical changes with respect to the previous
147 edition:
148 a) New terms and definitions on maximum admissible locating AC and DC currents and
149 voltages
150 b) The requirements locating current and locating voltage have been revised
151 c) Performance requirements have been added.
152 d) The test requirements for locating current and locating voltage have been revised
153 e) The structure of this part has been adapted to IEC 61557-1:2019
154 f) The limit values under A.2 were adapted to fit the changed test methods in 6.2.3

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155 The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
156
157 Full information on the voting for its approval can be found in the report on voting indicated in
158 the above table.
159 The language used for the development of this International Standard is English.
160 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
161 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
162 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
163 described in greater detail at www.iec.ch/standardsdev/publications.
164 This part of IEC 61557 shall be used in conjunction with Part 1.
165 A list of all parts in the IEC 61557 series, published under the general title Electrical safety in
166 low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing,
167 measuring or monitoring of protective measures, can be found on the IEC website.
168 The committee has decided that the contents of this document will remain unchanged until the
169 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
170 specific document. At this date, the document will be
171 • reconfirmed,
172 • withdrawn,
173 • replaced by a revised edition, or
174 • amended.
175
176

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177
178 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP
179 TO 1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING
180 OR MONITORING OF PROTECTIVE MEASURES –
181
182
183 Part 9: Equipment for insulation fault location in IT systems
184
185
186
187
188 1 Scope
189 This part of IEC 61557 specifies the requirements for the insulation fault location system (IFLS)
190 that localizes insulation faults in any part of the system in unearthed IT AC systems and
191 unearthed IT AC systems with galvanically connected DC circuits having nominal voltages up
192 to 1 000 V AC, as well as in unearthed IT DC systems with voltages up to 1 500 V DC,
193 independent of the measuring principle.
194 IT systems are described in IEC 60364-4-41. Additional data for a selection of devices in other
195 standards should be noted.
196 NOTE Further information on insulation fault location can be found in the following standards: IEC 60364-4-41:2005,
197 411.6, and IEC 60364-5-53:2019, 531.3.
198 2 Normative references
199 The following documents are referred to in the text in such a way that some or all of their content
200 constitutes requirements of this document. For dated references, only the edition cited applies.
201 For undated references, the latest edition of the referenced document (including any
202 amendments) applies.
203 IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
204 IEC 60068-2-27:2009, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
205 IEC 60364-7-710:2021, Electrical installations of buildings – Part 7-710: Requirements for
206 special installations or locations – Medical locations
207 IEC 60529, Degree of protection provided by enclosures (IP Code)
208 IEC 60721-3-1, Classification of environmental conditions – Part 3-1: Classification of groups
209 of environmental parameters and their severities – Storage
210 IEC 60721-3-2, Classification of environmental conditions – Part 3-2: Classification of groups
211 of environmental parameters and their severities – Transportation and handling
212 IEC 60721-3-3, Classification of environmental conditions – Part 3-3: Classification of groups
213 of environmental parameters and their severities – Stationary use at weatherprotected locations
214 IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control,
215 and laboratory use – Part 1: General requirements
216 IEC 61010-1:2010/AMD1:2016

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217 IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and
218 laboratory use – Part 2-030: Particular requirements for equipment having testing or measuring
219 circuits
220 IEC 61010-031, Safety requirements for electrical equipment for measurement, control and
221 laboratory use – Part 031: Safety requirements for hand-held and hand-manipulated probe
222 assemblies for electrical test and measurement
223 IEC 61010-2-032, Safety requirements for electrical equipment for measurement, control, and
224 laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated
225 current sensors for electrical test and measurement
226 IEC 61140, Protection against electric shock − Common aspects for installation and equipment
227 IEC 61326-2-2, Electrical equipment for measurement, control and laboratory use – EMC
228 requirements – Part 2-2: Particular requirements – Test configurations, operational conditions
229 and performance criteria for portable test, measuring and monitoring equipment used in low-
230 voltage distribution systems
231 IEC 61326-2-4, Electrical equipment for measurement, control and laboratory use – EMC
232 requirements – Part 2-4: Particular requirements – Test configurations, operational conditions
233 and performance criteria for insulation monitoring devices according to IEC 61557-8 and for
234 equipment for insulation fault location according to IEC 61557-9
235 IEC 61557-1:2019, Electrical safety in low voltage distribution systems up to 1 000 V AC and
236 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 1:
237 General requirements
238 IEC 61557-8:2014, Electrical safety in low voltage distribution systems up to 1 000 V AC and
239 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 8:
240 Insulation monitoring devices for IT systems
241 IEC 61326-1:2020, Electrical equipment for measurement, control and laboratory use - EMC
242 requirements - Part 1: General requirements
243 3 Terms, definitions and abbreviations
244 3.1 Terms, definitions, symbols and units
245 For the purposes of this document, the terms and definitions given in IEC 61557-1, IEC 61557-
246 8 and the following apply.
247 ISO and IEC maintain terminological databases for use in standardization at the following
248 addresses:
249 • IEC Electropedia: available at http://www.electropedia.org/
250 • ISO Online browsing platform: available at http://www.iso.org/obp
251 3.1.1
252 insulation fault location system
253 IFLS
254 device, equipment or combination of devices used for insulation fault location in IT systems
255 Note 1 to entry: IFLS functionality can be used in addition to insulation monitoring functionality. It injects a locating
256 current between the electrical system and earth and locates the insulation fault.
257 Note 2 to entry: The abbreviation ‘IFLS’ will be used in the document to denote insulation fault location system.

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258 3.1.2
259 locating current
260 I
L
261 current that is injected by the locating current injector during the location process. The locating
262 current can be generated by:
263 – an active locating source with a sufficiently large internal impedance using an independent
264 voltage source different from the system to be monitored, or
265 – a passive locating current source driven directly from the system to be monitored
266 3.1.3
267 locating voltage
268 U
L
269 voltage present at the measuring terminals of the locating current injector during the
270 measurement when the device has an active locating source
271 Note 1 to entry: In a fault-free, de-energized system, this represents the voltage present between the terminals of
272 the locating device to the system to be monitored and the terminals for the connection to the PE conductor.
273 3.1.4
274 response sensitivity
275 value of the evaluating current or insulation resistance at which the insulation fault locator
276 responds under specified conditions
277 Note 1 to entry: Response sensitivity can either be a fixed threshold or a response curve.
278 3.1.5
279 insulation fault locator
280 IFL
281 device or part of a device for the location of the insulation fault
282 3.1.6
283 locating current sensor
284 LCS
285 sensor for the detection of the locating current used for the location of the insulation fault
286 3.1.7
287 locating current injector
288 LCI
289 device or part of a device, that has the function to inject the locating current into the IT system
290 in order to locate the insulation fault
291 3.1.8
292 passive locating current injector
293 locating current injector that generates the locating current directly from the system to be
294 monitored
295 3.1.9
296 active locating current injector
297 locating current injector that generates the locating current from a locating voltage source which
298 is different from the system to be monitored
299 3.1.10
300 insulation fault location system in medical locations
301 MED-IFLS
302 specific insulation fault location equipment dedicated to locating insulation faults in IT systems
303 of group 2 medical locations
304 Note 1 to entry: The MED-IFLS is described in IEC 61557-9:20xx, Annex A.

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305 Note 2 to entry: Medical locations are defined in IEC 60364-7-710.
306 3.1.11
307 response time
308 t
al
309
...

prEN IEC 61557-9:2022

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

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

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

Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti do 1 000 kV in enosmerne napetosti do 1 500 kV - Oprema za preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov - 9. del: Oprema za ugotavljanje mesta izolacijske okvare v IT-sistemih

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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

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

Električna varnost v nizkonapetostnih razdelilnih sistemih za izmenične napetosti do 1 000 kV in enosmerne napetosti do 1 500 kV - Oprema za preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov - 9. del: Oprema za ugotavljanje mesta izolacijske okvare v IT-sistemih

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