Metallic cables and other passive components test methods - Part 4-7: Electromagnetic compatibility (EMC) -Test method for measuring of transfer impedance Z<sub>T</sub> and screening attenuation a<sub>S</sub> or coupling attenuation a<sub>C</sub> of connectors and assemblies - Triaxial tube in tube method (IEC 62153-4-7:2021)

This part of IEC 62153 deals with the triaxial tube in tube method. This triaxial method is suitable to determine the surface transfer impedance and/or screening attenuation and coupling attenuation of mated screened connectors (including the connection between cable and connector) and cable assemblies. This method could also be extended to determine the transfer impedance, coupling or screening attenuation of balanced or multipin connectors and multicore cable assemblies. For the measurement of transfer impedance and screening- or coupling attenuation, only one test set-up is needed.

Prüfverfahren für metallische Kommunikationskabel - Teil 4-7: Elektromagnetische Verträglichkeit (EMV) - Prüfverfahren zur Messung von Kopplungswiderstand ZT und von Schirm as- oder Kopplungsdämpfung ac von HF-Steckverbindern und konfektionierten Kabeln bis zu und über 3 GHz - Rohr-im-Rohr-Verfahren (IEC 62153-4-7:2021)

Méthodes d’essai des câbles métalliques et autres composants passifs - Partie 4-7: Compatibilité électromagnétique (CEM) - Méthode d’essai pour mesurer l’impédance de transfert, Z<sub>T</sub>,et l’affaiblissement d’écrantage, a<sub>S</sub>,ou l’affaiblissement de couplage, a<sub>C</sub>, des connecteurs et des cordons - Méthode triaxiale en tubes concentriques (IEC 62153-4-7:2021)

IEC 62153-4-7:2021 est disponible sous forme de IEC 62153-4-7:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 62153-4-7:2021 traite de la méthode triaxiale en tubes concentriques. Cette méthode triaxiale convient pour déterminer l’impédance surfacique de transfert et/ou l’affaiblissement d’écrantage et l’affaiblissement de couplage de connecteurs écrantés et accouplés (y compris la connexion entre le câble et le connecteur) et de cordons. Cette méthode pourrait également être étendue pour déterminer l’impédance de transfert, l’affaiblissement de couplage ou l’affaiblissement d’écrantage de connecteurs symétriques ou à plusieurs broches et de cordons multiconducteurs. Cette troisième édition annule et remplace la deuxième édition parue en 2015, et son Amendement 1:2018. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: - l’Annexe E contient des informations relatives au mesurage direct de l’efficacité d’écrantage des connecteurs; - l’Annexe F donne des informations normatives sur les paramètres du mode mixte; - l’Annexe G contient des informations normatives concernant les accessoires permettant de mesurer l’affaiblissement de couplage; - l’Annexe H traite de l’affaiblissement d’écrantage à basse fréquence

Preskusne metode za kovinske kable in druge pasivne komponente - 4-7. del: Elektromagnetna združljivost (EMC) - Preskusna metoda za meritve prehodne impedance Z<sub>T</sub> in zaslonskega slabljenja a<sub>S</sub> ali sklopnega slabljenja a<sub>C</sub> konektorjev in sestavov - Metoda "cev v cevi" (IEC 62153-4-7:2021)

General Information

Status
Published
Publication Date
13-Sep-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Sep-2021
Due Date
18-Nov-2021
Completion Date
14-Sep-2021

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SLOVENSKI STANDARD
SIST EN IEC 62153-4-7:2021
01-november-2021
Nadomešča:
SIST EN 62153-4-7:2016
SIST EN 62153-4-7:2016/A1:2018
SIST EN 62153-4-7:2016/AC:2016
Preskusne metode za kovinske kable in druge pasivne komponente - 4-7. del:
Elektromagnetna združljivost (EMC) - Preskusna metoda za meritve prehodne
impedance ZT in zaslonskega slabljenja aS ali
sklopnega slabljenja aC konektorjev in sestavov - Metoda "cev v
cevi" (IEC 62153-4-7:2021)

Metallic cables and other passive components test methods - Part 4-7: Electromagnetic

compatibility (EMC) -Test method for measuring of transfer impedance ZT

and screening attenuation aS or coupling attenuation aC of
connectors and assemblies - Triaxial tube in tube method (IEC 62153-4-7:2021)
Prüfverfahren für metallische Kommunikationskabel - Teil 4-7: Elektromagnetische
Verträglichkeit (EMV) - Prüfverfahren zur Messung von Kopplungswiderstand ZT und
von Schirm as- oder Kopplungsdämpfung ac von HF-Steckverbindern und

konfektionierten Kabeln bis zu und über 3 GHz - Rohr-im-Rohr-Verfahren (IEC 62153-4-

7:2021)

Méthodes d’essai des câbles métalliques et autres composants passifs - Partie 4-7:

Compatibilité électromagnétique (CEM) - Méthode d’essai pour mesurer l’impédance de

transfert, ZT,et l’affaiblissement d’écrantage, aS,ou
l’affaiblissement de couplage, aC, des connecteurs et des cordons -
Méthode triaxiale en tubes concentriques (IEC 62153-4-7:2021)
Ta slovenski standard je istoveten z: EN IEC 62153-4-7:2021
SIST EN IEC 62153-4-7:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62153-4-7:2021
---------------------- Page: 2 ----------------------
SIST EN IEC 62153-4-7:2021
EUROPEAN STANDARD EN IEC 62153-4-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 33.100.10; 33.120.10 Supersedes EN 62153-4-7:2016 and all of its
amendments and corrigenda (if any)
English Version
Metallic cables and other passive components test methods -
Part 4-7: Electromagnetic compatibility (EMC) - Test method for
measuring of transfer impedance Z and screening attenuation
a or coupling attenuation a of connectors and assemblies -
S C
Triaxial tube in tube method
(IEC 62153-4-7:2021)

Méthodes d'essai des câbles métalliques et autres Prüfverfahren für metallische Kommunikationskabel - Teil 4-

composants passifs - Partie 4-7: Compatibilité 7: Elektromagnetische Verträglichkeit (EMV) - Prüfverfahren

électromagnétique (CEM) - Méthode d'essai pour mesurer zur Messung von Kopplungswiderstand Z und von Schirm

l'impédance de transfert, Z , et l'affaiblissement d'écrantage a - oder Kopplungsdämpfung a von HF-Steckverbindern

T S C
a , ou l'affaiblissement de couplage, a , des connecteurs et
S C und konfektionierten Kabeln bis zu und über 3 GHz - Rohr-
des cordons - Méthode triaxiale en tubes concentriques im-Rohr-Verfahren
(IEC 62153-4-7:2021) (IEC 62153-4-7:2021)

This European Standard was approved by CENELEC on 2021-08-27. 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

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62153-4-7:2021 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62153-4-7:2021
EN IEC 62153-4-7:2021 (E)
European foreword

The text of document 46/812/FDIS, future edition 3 of IEC 62153-4-7, prepared by IEC/TC 46 “Cables,

wires, waveguides, RF connectors, RF and microwave passive components and accessories” was

submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62153-4-7:2021.

The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2022–05–27

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024–08–27

document have to be withdrawn

This document supersedes EN 62153-4-7:2016 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 62153-4-7:2021 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 62153-4-16 NOTE Harmonized as EN IEC 62153-4-16
To be published. Stage at time of publication: FprEN IEC 62153-4-16:2021.
---------------------- Page: 4 ----------------------
SIST EN IEC 62153-4-7:2021
EN IEC 62153-4-7:2021 (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/TS 62153-4-1 2014 Metallic communication cable test methods
- Part 4–1: Electromagnetic compatibility
(EMC) - Introduction to electromagnetic
screening measurements
IEC 62153-4-3 - Metallic communication cable test methods - -
- Part 4–3: Electromagnetic compatibility
(EMC) - Surface transfer impedance -
Triaxial method
IEC 62153-4-4 - Metallic communication cable test methods - -
- Part 4–4: Electromagnetic compatibility
(EMC) - Test method for measuring of the
screening attenuation as up to and above
3 GHz, triaxial method
IEC 62153-4-8 - Metallic cables and other passive - -
components - Test methods - Part 4–8:
Electromagnetic compatibility (EMC) -
Capacitive coupling admittance
IEC 62153-4-9 2018 Metallic communication cable test methods
- Part 4–9: Electromagnetic compatibility
(EMC) - Coupling attenuation of screened
balanced cables, triaxial method
IEC 62153-4-10 Metallic communication cable test methods
- Part 4–10: Electromagnetic compatibility
(EMC) - Transfer impedance and
screening attenuation of feed-throughs and
electromagnetic gaskets - Double coaxial
test method
IEC 62153-4-15 2015 Metallic communication cable test methods - -
- Part 4–15: Electromagnetic compatibility
(EMC) - Test method for measuring
transfer impedance and screening
attenuation - or coupling attenuation with
triaxial cell
---------------------- Page: 5 ----------------------
SIST EN IEC 62153-4-7:2021
EN IEC 62153-4-7:2021 (E)
IEC 62153-4-16 - Metallic cables and other passive - -
components test methods - Part 4–16:
Electromagnetic compatibility (EMC) -
Extension of the frequency range to higher
frequencies for transfer impedance and to
lower frequencies for screening attenuation
measurements using the triaxial set-up
- - Coaxial cables - Part 9–2: Sectional EN 50117-9-2 2019
specification for coaxial cables for
analogue and digital transmission - Indoor
droop cables for systems operating at
5 MHz – 3 000 MHz
---------------------- Page: 6 ----------------------
SIST EN IEC 62153-4-7:2021
IEC 62153-4-7
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Metallic cables and other passive components test methods –
Part 4-7: Electromagnetic compatibility (EMC) – Test method for measuring
of transfer impedance Z and screening attenuation a or coupling attenuation
T S
a of connectors and assemblies – Triaxial tube in tube method
Méthodes d’essai des câbles métalliques et autres composants passifs –
Partie 4-7: Compatibilité électromagnétique (CEM) – Méthode d’essai pour
mesurer l’impédance de transfert, Z ,et l’affaiblissement d’écrantage, a , ou
T S
l’affaiblissement de couplage, a , des connecteurs et des cordons – Méthode
triaxiale en tubes concentriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10; 33.120.10 ISBN 978-2-8322-9988-3

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
---------------------- Page: 7 ----------------------
SIST EN IEC 62153-4-7:2021
– 2 – IEC 62153-4-7:2021 © IEC 2021
CONTENTS

FOREWORD ......................................................................................................................... 6

INTRODUCTION ................................................................................................................... 8

1 Scope ............................................................................................................................ 9

2 Normative references..................................................................................................... 9

3 Terms and definitions .................................................................................................. 10

4 Physical background .................................................................................................... 12

5 Principle of the test methods ........................................................................................ 12

5.1 General ............................................................................................................... 12

5.2 Transfer impedance ............................................................................................ 13

5.3 Screening attenuation ......................................................................................... 13

5.4 Coupling attenuation ........................................................................................... 14

6 Test procedure ............................................................................................................ 15

6.1 General ............................................................................................................... 15

6.2 Tube in tube procedure ....................................................................................... 15

6.3 Test equipment ................................................................................................... 16

6.4 Calibration procedure .......................................................................................... 16

6.5 Connection between extension tube and device under test ................................... 17

6.6 Dynamic range respectively noise floor ................................................................ 17

6.7 Impedance matching ........................................................................................... 18

6.8 Influence of adapters ........................................................................................... 18

7 Sample preparation ..................................................................................................... 19

7.1 Coaxial connector or device ................................................................................ 19

7.2 Balanced or multiconductor device ...................................................................... 19

7.3 Cable assembly .................................................................................................. 21

8 Measurement of transfer impedance ............................................................................ 21

8.1 General ............................................................................................................... 21

8.2 Principle block diagram of transfer impedance ..................................................... 21

8.3 Measuring procedure – Influence of connecting cables ......................................... 22

8.4 Measuring ........................................................................................................... 22

8.5 Evaluation of test results ..................................................................................... 22

8.6 Test report .......................................................................................................... 23

9 Screening attenuation .................................................................................................. 23

9.1 General ............................................................................................................... 23

9.2 Impedance matching ........................................................................................... 23

9.2.1 General ....................................................................................................... 23

9.2.2 Evaluation of test results with matched conditions ......................................... 24

9.2.3 Measuring with mismatch ............................................................................. 25

9.2.4 Evaluation of test results .............................................................................. 25

9.3 Test report .......................................................................................................... 25

10 Coupling attenuation .................................................................................................... 26

10.1 General ............................................................................................................... 26

10.2 Procedure for testing connectors ......................................................................... 26

10.3 Procedure for testing cable assemblies ................................................................ 27

10.4 Evaluation of test results when using a balun ....................................................... 28

10.5 Evaluation of test results when using a multiport VNA .......................................... 28

---------------------- Page: 8 ----------------------
SIST EN IEC 62153-4-7:2021
IEC 62153-4-7:2021 © IEC 2021 – 3 –

10.6 Test report .......................................................................................................... 29

Annex A (normative) Determination of the impedance of the inner circuit ............................ 30

Annex B (informative) Example of a self-made impedance matching adapter ....................... 31

Annex C (informative) Measurements of the screening effectiveness of connectors

and cable assemblies ......................................................................................................... 33

C.1 General ............................................................................................................... 33

C.2 Physical basics ................................................................................................... 33

C.2.1 General coupling equation ............................................................................ 33

C.2.2 Coupling transfer function ............................................................................ 35

C.3 Triaxial test set-up .............................................................................................. 37

C.3.1 General ....................................................................................................... 37

C.3.2 Measurement of cable assemblies ................................................................ 38

C.3.3 Measurement of connectors ......................................................................... 39

C.4 Conclusion .......................................................................................................... 42

Annex D (informative) Influence of contact resistances ....................................................... 43

Annex E (informative) Direct measurement of screening effectiveness of connectors .......... 45

E.1 Scope ................................................................................................................. 45

E.2 Test set-up.......................................................................................................... 45

E.3 Construction details of test set-up ........................................................................ 46

Annex F (normative) Mixed mode S-parameters ................................................................. 48

F.1 General ............................................................................................................... 48

F.2 Definition of mixed mode S-parameters ............................................................... 48

F.3 Reference impedance of a VNA ........................................................................... 51

Annex G (normative) Accessories for measuring coupling attenuation ................................. 52

G.1 TP connecting unit .............................................................................................. 52

G.2 Termination of the DUT ....................................................................................... 52

G.3 Test adapter ....................................................................................................... 53

G.3.1 General ....................................................................................................... 53

G.3.2 Direct feeding with coaxial cables ................................................................. 53

G.3.3 Balanced feeding cable ................................................................................ 54

G.3.4 Movable short circuit .................................................................................... 54

Annex H (informative) Low frequency screening attenuation ............................................... 56

Bibliography ....................................................................................................................... 57

Figure 1 – Definition of Z ................................................................................................... 10

Figure 2 – Principle of the test set-up to measure transfer impedance and screening or

coupling attenuation of connectors with tube in tube ............................................................ 13

Figure 3 – Principle of the test set-up to measure transfer impedance and screening

attenuation of a cable assembly .......................................................................................... 15

Figure 4 – Principle set-up for verification test ..................................................................... 18

Figure 5 – Preparation of balanced or multiconductor connectors ......................................... 21

Figure 6 – Test set-up (principle) for transfer impedance measurement according to

test of IEC 62153-4-3 with load resistor in inner circuit and without damping resistor in

outer circuit ........................................................................................................................ 22

Figure 7 – Measuring the screening attenuation with tube in tube with impedance

matching device .................................................................................................................. 24

Figure 8 – Coupling attenuation, principle test set-up with 2-port VNA and balun .................. 26

---------------------- Page: 9 ----------------------
SIST EN IEC 62153-4-7:2021
– 4 – IEC 62153-4-7:2021 © IEC 2021
Figure 9 – Coupling attenuation, principle set-up with multiport VNA and

TP‑connecting unit .............................................................................................................. 27

Figure 10 – Coupling attenuation, principle test set-up with multiport VNA and

TP‑connecting unit for measuring complete cable assemblies .............................................. 27

Figure 11 – Coupling attenuation, principle test set-up with multiport VNA and

TP‑connecting unit for measuring halved cable assemblies .................................................. 28

Figure 12 – Typical measurement of a connector of 0,04 m length with 1 m extension tube .. 29

Figure B.1 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter,

log scale ............................................................................................................................. 31

Figure B.2 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter,

lin scale .............................................................................................................................. 32

Figure C.1 – Equivalent circuit of coupled transmission lines ............................................... 34

Figure C.2 – Summing function S ........................................................................................ 35

Figure C.3 – Calculated coupling transfer function (l = 1 m; e = 2,3; e = 1; Z = 0) .......... 36

r1 r2 F

Figure C.4 – Triaxial set-up for the measurement of the screening attenuation a and

the transfer impedance Z .................................................................................................. 37

Figure C.5 – Simulation of a cable assembly (logarithmic scale) .......................................... 39

Figure C.6 – Simulation of a cable assembly (linear scale) ................................................... 39

Figure C.7 – Triaxial set-up with extension tube for short cable assemblies .......................... 40

Figure C.8 – Triaxial set-up with extension tube for connectors ............................................ 40

Figure C.9 – Simulation, logarithmic frequency scale .......................................................... 41

Figure C.10 – Measurement, logarithmic frequency scale .................................................... 41

Figure C.11 – Simulation, linear frequency scale ................................................................ 41

Figure C.12 – Measurement, linear frequency scale ............................................................ 41

Figure C.13 – Simulation, logarithmic frequency scale ........................................................ 42

Figure C.14 – simulation, linear frequency scale ................................................................. 42

Figure D.1 – Contact resistances of the test set-up .............................................................. 43

Figure D.2 – Equivalent circuit of the test set-up .................................................................. 43

Figure E.1 – Principle of the test set-up to measure transfer impedance and screening

attenuation of a connector ................................................................................................... 45

Figure E.2 – Principle of the test set-up to measure transfer impedance and screening

attenuation of a cable assembly .......................................................................................... 46

Figure E.3 – Example of sample preparing .......................................................................... 46

Figure E.4 – Screening tube with separate nut ..................................................................... 47

Figure E.5 – Screening fixed with associated nut ................................................................. 47

Figure F.1 – Common two-port network ............................................................................... 48

Figure F.2 – Common four port network ............................................................................... 48

Figure F.3 – Physical and logical ports of a VNA ................................................................. 49

Figure F.4 – Nomenclature of mixed mode S-parameters ..................................................... 49

Figure F.5 – Measurement configuration, single ended response ......................................... 50

Figure F.6 – Measurement configuration, differential mode response ................................... 51

Figure G.1 – Termination of the device under test, principle ................................................. 53

Figure G.2 – Balunless measurement of coupling attenuation of a balanced connector,

direct feeding, principle ....................................................................................................... 54

Figure G.3 – Balunless measurement of coupling attenuation of a cable assembly

using balanced feeding cable, principle ............................................................................... 54

---------------------- Page: 10 ----------------------
SIST EN IEC 62153-4-7:2021
IEC 62153-4-7:2021 © IEC 2021 – 5 –
Figure G.4 – Balunless measurement of coupling attenuation of a cable assembly

using adapters with implemented short circuit, principle ....................................................... 55

Figure H.1 – Example for a screening attenuation test result of a cable assembly with a

test length of 2 meters ........................................................................................................ 56

Table 1 – IEC 62153, Metallic communication cable test methods – Test procedures

with triaxial test set-up ........................................................................................................ 12

Table G.1 – TP-connecting unit performance characteristics (100 kHz to 2 GHz) .................. 52

---------------------- Page: 11 ----------------------
SIST EN IEC 62153-4-7:2021
– 6 – IEC 62153-4-7:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METALLIC CABLES AND OTHER PASSIVE
COMPONENTS TEST METHODS –
Part 4-7: Electromagnetic compatibility (EMC) –
Test method for measuring of transfer impedance Z and screening
attenuation a or coupling attenuation a of connectors and assemblies –
S C
Triaxial tube in tube method
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 N
...

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