EN IEC 61557-9:2025/prAA:2025
(Amendment)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
This part of IEC 61557 specifies the requirements for the insulation fault location system (IFLS) that localizes insulation faults in any part of the system in unearthed IT AC systems and unearthed IT AC systems with galvanically connected DC circuits having nominal voltages up to 1 000 V AC, as well as in unearthed IT DC systems with voltages up to 1 500 V DC, independent of the measuring principle. IT systems are described in IEC 60364-4-41. 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 60364-5-53:2019, 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
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
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
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-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
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
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: EN IEC 61557-9:2025/prAA: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 DRAFT
EN IEC 61557-9:2025
NORME EUROPÉENNE
EUROPÄISCHE NORM
prAA
September 2025
ICS 25.040.40 -
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
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
This draft amendment prAA, if approved, will modify the European Standard EN IEC 61557-9:2025; it is submitted to CENELEC members
for enquiry.
Deadline for CENELEC: 2025-12-19.
It has been drawn up by CLC/TC 85X.
If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
This draft amendment was established by CENELEC 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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.
Project: 80091 Ref. No. EN IEC 61557-9:2025/prAA:2025 E
Contents Page
1 European foreword . 3
2 1 Modification to Clause 1, “Scope” . 4
3 2 Modifications to 4.3, “Optional functions provided by IFLS” . 4
4 3 Modifications to 4.4, “Performance requirements” . 4
5 4 Modifications to 4.5, “Safety requirements” . 4
6 5 Modifications to 4.6, “Electromagnetic compatibility” . 4
7 6 Modifications to 4.7, “Mechanical requirements” . 7
8 7 Modifications to 5.1, “Marking” . 7
9 8 Modifications to 5.2, “Operating instructions” . 8
10 9 Modifications to 6.1, “General” . 8
11 10 Modifications to 6.2, “Type tests” . 8
12 11 Modifications to 6.3, “Routine tests” . 8
13 Annex ZA (normative) Normative references to international publications with their
14 corresponding European publications . 10
15 Annex ZZA (informative) Relationship between this European standard and the safety objectives
16 of Directive 2014/35/EU [2014 OJ L96] aimed to be covered . 13
17 Annex ZZB (informative) Relationship between this European standard and the essential
18 requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be covered . 15
19 European foreword
20 This document (EN IEC 61557-9:2025/prAA:2025) has been prepared by CLC/TC 85X" Measuring equipment
21 for electrical and electromagnetic quantities ".
22 This document is currently submitted to the Enquiry.
23 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
24 This document has been prepared under a standardization request addressed to CENELEC by the European
25 Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
26 Member States.
27 For the relationship with EU Legislation, see informative Annexes ZZA and ZZB, which are an integral part of
28 this document.
29 1 Modification to Clause 1, “Scope”
30 Replace the text with the following:
31 “This part of IEC 61557 specifies the requirements for the insulation fault location system (IFLS) that localizes
32 insulation faults in any part of the system in unearthed IT AC systems and unearthed IT AC systems with
33 galvanically connected DC circuits having nominal voltages up to 1 000 V AC, as well as in unearthed IT DC
34 systems with voltages up to 1 500 V DC, independent of the measuring principle.
35 This document covers both passive IFLS and active IFLS. Active IFLS can be used in de-energised systems.
36 This document does not cover IMD complying with IEC 61557-8.
37 NOTE 1 IT systems are described in IEC 60364-4-41. Further information on insulation fault location can be found in
38 the following International Standards: IEC 60364-4-41:2005, 411.6, and IEC 60364-5-53:2019, 531.3.”
39 2 Modifications to 4.3, “Optional functions provided by IFLS”
40 In 4.3.1, replace “by the manufacturer” with “in the operating instructions”.
41 3 Modifications to 4.4, “Performance requirements”
st
42 In 4.4.1, at the end of the 1 paragraph, add the following sentence:
43 “The response sensitivity shall be stated in the operating instructions.”
44 In 4.4.1, replace “by the manufacturer” with “in the operating instructions”.
st
45 In 4.4.2, in the 1 paragraph, replace:
46 “unintentional changes of the setting shall be prevented by suitable means.”
47 with
48 “it shall be designed in such a way that it is impossible to be adjusted by unauthorized persons.”
49 and add the following note:
50 “NOTE The use of a key, a tool or a password are possible examples.”
st
51 In 4.4.4, replace the 1 paragraph with the following:
52 “For IFLS with separate connections for the supply voltage Us, information about the admissible range of the
53 supply voltage Us shall be stated in the operating instructions.”
54 4 Modifications to 4.5, “Safety requirements”
st
55 In 4.5.1, replace the 1 paragraph with the following:
56 “An IFLS shall have minimum clearance and creepage distances for mains circuits in accordance with
57 IEC 61010-1:2010, Annex K and for secondary or measurement circuits in accordance with
58 IEC 61010-2-030:2023, Annex K.”
59 and delete the note.
60 5 Modifications to 4.6, “Electromagnetic compatibility”
61 Add the following below the paragraph:
62 “
63 Clause 1 of IEC 61326-2-2:2020 applies, except as follows.
64 Replace the last paragraph with the following:
65 “Test specifications shall be used in accordance with IEC 61326-1:2020, Annex A.”
66 Subclause 6.2.101 of IEC 61326-2-2:2020 does not apply.
67 Subclause 6.1.103 of IEC 61326-2-4:2020 does not apply.
68 Subclause 6.1.106 of IEC 61326-2-4:2020 does not apply.
69 Table 101 of IEC 61326-2-4:2020 applies, except as follows.
70 Delete footnotes a and b.
71 Replace the content of column 4, row 2 with the following:
72 “10 V/m (80 MHz to 1 000 MHz)
73 3 V/m (1 GHz to 6 GHz)”
74 Table 102 of IEC 61326-2-4:2020 applies, except as follows.
75 Replacement:
76 Table 102 — Performance criteria definition
Function Criterion A1 Criterion A2 Criterion B Criterion C
(for permanent (for transient
phenomena) phenomena)
a a a a
Alarm In Quiescent mode : In Quiescent mode : In Quiescent mode : In Quiescent mode :
functions The alarm digital output The alarm digital output The alarm digital output The alarm digital output
and the visual indicators and the visual indicators and the visual indicators and the visual indicators
shall not switch to the shall not switch to the may switch to the alarm may switch to the alarm
alarm state during the alarm state during the state but shall not state but should not
test. test. remain in the alarm remain in the alarm
state after the test. state after the test. The
alarm state may be
restored by the user. If
necessary, a recovery
procedure shall be
stated in the operating
instructions. No
permanent damage to
the equipment is
allowed.
a a a a
In Operate mode : The In Operate mode : The In Operate mode : The In Operate mode : The
alarm digital output and alarm digital output and alarm digital output and alarm digital output and
the visual indicators the visual indicators the visual indicators the visual indicators
shall switch to the alarm shall switch to the alarm need not remain in the need not remain in the
state and remain in the state and remain in the alarm state during this alarm state during this
alarm state during the alarm state during the test but shall switch to test but shall switch to
test. test. or remain in the alarm or remain in the alarm
state after the test. state after the test. No
permanent damage to
the equipment is
allowed.
Function Criterion A1 Criterion A2 Criterion B Criterion C
(for permanent (for transient
phenomena) phenomena)
Measurement When insulation fault After the test, the EUT After the test, the EUT After the test, the EUT
functions location equipment shall continue to shall continue to shall continue to
includes indicators for operate as intended. operate as intended. operate as intended. No
the INSULATION permanent damage to
RESISTANCE or the equipment is
equivalent values, the allowed.
measurement
uncertainty during the
immunity test shall not
be greater than the
specified measurement
uncertainty stated in the
operating instructions.
Human Visual indicators (for Visual indicators (for Visual indicators (for Visual indicators (for
machine example, displays, example, displays, example, displays, example, displays,
Interface LEDs) and remote LEDs) and remote LEDs) and remote LEDs) and remote
functions functions (for example, functions (for example, functions (for example, functions (for example,
analogue or digital analogue or digital analogue or digital analogue or digital
control interfaces) shall control interfaces) may control interfaces) may control interfaces) may
work as intended. be influenced during the be influenced during the be influenced during the
test. After the test, the test. After the test, the test. After the test, the
visual indicators and visual indicators and visual indicators and
remote functions shall remote functions shall remote functions should
continue to operate as continue
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.