SIST EN IEC 61557-3:2022

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 3: Loop impedance (IEC 61557-3:2019)

This part of IEC 61557 specifies the requirements applicable to equipment for measuring the
loop impedance between a line conductor and protective conductor; between a line conductor
and neutral; or between two line conductors by using the voltage drop when the circuit under
test is loaded.

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 3: Schleifenwiderstand (IEC 61557-3:2019)

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 3: Impédance de boucle (IEC 61557-3:2019)

IEC 61557-3:2019 est disponible sous forme de IEC 61557-3:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L'IEC 61557-3:2019 spécifie les exigences applicables aux appareils destinés à mesurer l'impédance de boucle entre un conducteur de ligne et le conducteur de protection, entre un conducteur de ligne et le conducteur neutre, ou entre deux conducteurs de ligne en utilisant la chute de tension lorsque le circuit en essai est chargé. L'IEC 61557-3:2019 annule et remplace la deuxième édition parue en 2007. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'une exigence relative à la catégorie de mesure;
b) ajout de nouvelles exigences relatives aux instructions de fonctionnement;
c) alignement de la structure sur l'ensemble de la série IEC 61557.

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 - 3. del: Impedanca zanke (IEC 61557-3:2019)

Ta del standarda IEC 61557 določa zahteve, ki se uporabljajo za opremo za merjenje impedance zanke med linijskim in zaščitnim vodnikom, med linijskim in nevtralnim vodnikom ali med dvema linijskima vodnikoma z uporabo padca napetosti ob obremenitvi preskušanega tokokroga.

General Information

• Status: Published
• Public Enquiry End Date: 29-Apr-2018
• Publication Date: 08-Sep-2022
• 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: 07-Jun-2022
• Due Date: 12-Aug-2022
• Completion Date: 09-Sep-2022
• 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
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Ref Project: EN IEC 61557-3:2022 - 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 3: Loop impedance

Relations

• Replaces: SIST EN 61557-3:2007 - 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 3: Loop impedance
• Effective Date: 24-May-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61557-3:2022
01-oktober-2022
Nadomešča:
SIST EN 61557-3:2007
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 - 3. del: Impedanca zanke (IEC 61557-3:2019)
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 3: Loop
impedance (IEC 61557-3:2019)
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 3:
Schleifenwiderstand (IEC 61557-3:2019)
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 3: Impédance de boucle (IEC 61557-3:2019)
Ta slovenski standard je istoveten z: EN IEC 61557-3:2022
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
SIST EN IEC 61557-3:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61557-3:2022

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SIST EN IEC 61557-3:2022


EUROPEAN STANDARD EN IEC 61557-3

NORME EUROPÉENNE

EUROPÄISCHE NORM May 2022
ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-3:2007
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 3: Loop impedance
(IEC 61557-3:2019)
Sécurité électrique dans les réseaux de distribution basse Elektrische Sicherheit in Niederspannungsnetzen bis AC
tension au plus égale à 1 000 V c.a. et 1 500 V 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 3:
mesures de protection - Partie 3: Impédance de boucle Schleifenwiderstand
(IEC 61557-3:2019) (IEC 61557-3:2019)
This European Standard was approved by CENELEC on 2022-04-06. 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,
Turkey 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61557-3:2022 E

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SIST EN IEC 61557-3:2022
EN IEC 61557-3:2022 (E)
European foreword
The text of document 85/687/FDIS, future edition 3 of IEC 61557-3, 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 IEC 61557-3:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-01-06
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-04-06
document have to be withdrawn
This document supersedes EN 61557-3:2007 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 has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association.
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 61557-3:2019 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61800-5-2 NOTE Harmonized as EN 61800-5-2
2

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SIST EN IEC 61557-3:2022
EN IEC 61557-3:2022 (E)
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.cenelec.eu.
Publication Year Title EN/HD Year
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 2017 Safety requirements for electrical EN IEC 61010-2-030 2021
equipment for measurement, control, and
laboratory use - Part 2-030: Particular
requirements for equipment having
testing or measuring circuits
- - + A11 2021
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

3

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SIST EN IEC 61557-3:2022

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SIST EN IEC 61557-3:2022



IEC 61557-3

®


Edition 3.0 2019-07




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 3: Loop impedance



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 3: Impédance de boucle










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-7156-8




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 IEC 61557-3:2022
– 2 – IEC 61557-3:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions. 5
4 Requirements . 6
4.1 General . 6
4.2 Measurement of loop impedance . 6
4.3 External resistance . 6
4.4 Fault voltage exceeding U . 7
L
4.5 Overvoltage . 7
5 Marking and operating instructions . 7
5.1 Marking . 7
5.2 Operating instructions . 7
6 Tests . 8
6.1 General . 8
6.2 Operating uncertainty . 8
6.3 External resistance . 10
6.4 Fault voltage . 10
6.5 Overvoltage . 10
Bibliography . 11

Table 1 – Calculation of operating uncertainty . 9

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SIST EN IEC 61557-3:2022
IEC 61557-3:2019 © IEC 2019 – 3 –
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 3: Loop impedance

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
...

SLOVENSKI STANDARD
oSIST prEN 61557-3:2018
01-april-2018
(OHNWULþQDYDUQRVWYQL]NRQDSHWRVWQLKUD]GHOLOQLKVLVWHPLK]DL]PHQLþQHQDSHWRVWL
GRN9LQHQRVPHUQHQDSHWRVWLGRN92SUHPD]DSUHVNXãDQMHPHUMHQMHDOL
QDG]RURYDQMH]DãþLWQLKXNUHSRYGHO,PSHGDQFD]DQNH
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 3: Loop
impedance
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 3:
Schleifenwiderstand
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 3: Impédance de boucle
Ta slovenski standard je istoveten z: prEN 61557-3:2018
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
oSIST prEN 61557-3:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 61557-3:2018

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oSIST prEN 61557-3:2018
85/631/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61557-3 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2018-02-09 2018-05-04
SUPERSEDES DOCUMENTS:
85/609/CD,85/623/CC

IEC TC 85 : MEASURING EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES
SECRETARIAT: SECRETARY:
China Mr Bo Chen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 44,TC 64,TC 66
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 3: Loop impedance

PROPOSED STABILITY DATE: 2025

NOTE FROM TC/SC OFFICERS:


1
Copyright © 2017 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 61557-3:2018
- 2 - 85/631/CDV
2 CONTENTS
3
4 FOREWORD . - 3 -
5 1 Scope . - 5 -
6 2 Normative references . - 5 -
7 3 Terms and definitions . - 5 -
8 4 Requirements . - 6 -
9 4.1 General . - 6 -
10 4.2 Measurement of loop impedance . - 6 -
11 4.3 External resistance . - 6 -
12 4.4 Fault voltage exceeding U . - 6 -
L
13 4.5 Overvoltage . - 6 -
14 5 Marking and operating instructions . - 6 -
15 5.1 Marking . - 6 -
16 5.2 Operating instructions . - 7 -
17 6 Tests . - 7 -
18 6.1 General . - 7 -
19 6.2 Operating uncertainty . - 7 -
20 6.3 External resistance . - 9 -
21 6.4 Fault voltage . - 9 -
22 6.5 Overvoltage . - 9 -
23 Bibliography . - 10 -
24
25 Table 1 – Calculation of operating uncertainty . - 8 -
26

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oSIST prEN 61557-3:2018
- 3 - 85/631/CDV
27 INTERNATIONAL ELECTROTECHNICAL COMMISSION
28 ____________
29
30 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
31 UP TO 1 000 V AC AND 1 500 V DC –
32 EQUIPMENT FOR TESTING, MEASURING OR MONITORING
33 OF PROTECTIVE MEASURES –
34
35 Part 3: Loop impedance
36
37 FOREWORD
38 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
39 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
40 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
41 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
42 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
43 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
44 in the subject dealt with may participate in this preparatory work. International, governmental and non-
45 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
46 with the International Organization for Standardization (ISO) in accordance with conditions determined by
47 agreement between the two organizations.
48 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
49 consensus of opinion on the relevant subjects since each technical committee has representation from all
50 interested IEC National Committees.
51 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
52 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
53 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
54 misinterpretation by any end user.
55 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
56 transparently to the maximum extent possible in their national and regional publications. Any divergence
57 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
58 the latter.
59 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
60 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
61 services carried out by independent certification bodies.
62 6) All users should ensure that they have the latest edition of this publication.
63 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
64 members of its technical committees and IEC National Committees for any personal injury, property damage or
65 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
66 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
67 Publications.
68 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
69 indispensable for the correct application of this publication.
70 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
71 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
72 International Standard IEC 61557-3 has been prepared by IEC technical committee TC85:
73 Measuring equipment for electrical and electromagnetic quantities
74 This third edition cancels and replaces the second edition published in 2009. This edition
75 constitutes a technical revision.
76 This edition includes the following significant technical changes with respect to the previous
77 edition:
78 a) requirement for measurement category added
79 b) new requirements for operating instructions added
80 c) Alignment of the structure to the whole series IEC61557
81
82 The text of this standard is based on the following documents:

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oSIST prEN 61557-3:2018
- 4 - 85/631/CDV
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
83
84 Full information on the voting for the approval of this standard can be found in the report on
85 voting indicated in the above table.
86 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
87 This part of IEC 61557 shall be used in conjunction with Part 1.
88 A list of all parts in the IEC 61557 series, published under the general title Electrical safety in
89 low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing,
90 measuring or monitoring of protective measure,’ can be found on the IEC website.
91 The committee has decided that the contents of this publication will remain unchanged until
92 the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
93 related to the specific publication. At this date, the publication will be
94 • reconfirmed,
95 • withdrawn,
96 • replaced by a revised edition, or
97 • amended.
98
99 The National Committees are requested to note that for this publication the stability date
100 is 2025
101 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE
102 DELETED AT THE PUBLICATION STAGE.

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oSIST prEN 61557-3
...