IEC 60437:2023

IEC 60437 ®
Edition 3.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Radio interference test on high-voltage insulators

Essai de perturbations radioélectriques des isolateurs pour haute tension

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IEC 60437 ®
Edition 3.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Radio interference test on high-voltage insulators

Essai de perturbations radioélectriques des isolateurs pour haute tension

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10  ISBN 978-2-8322-7746-1

– 2 – IEC 60437:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Measurement frequency . 7
5 Radio noise limits and test voltage . 7
6 Measuring instruments . 7
6.1 Standard CISPR measuring apparatus . 7
6.2 Other measuring apparatus . 8
7 Measuring circuit . 8
8 Requirements for test voltage . 8
9 Atmospheric conditions . 8
10 Test area . 9
11 Arrangements of insulators for test . 9
11.1 Mounting of insulators . 9
11.2 Conditions of insulators before test . 10
11.3 Checking and calibration of test circuit . 10
12 Type test . 10
12.1 Number of insulators . 10
12.2 Voltage application and RI characteristics . 11
12.3 Acceptance criterion . 11
13 Sample tests . 11
13.1 General . 11
13.2 Insulators subjected to sample tests . 11
13.3 Number of samples . 12
13.4 Test procedure . 12
13.5 Acceptance criterion . 12
13.6 Re-test procedure . 12
14 Test report . 13

Figure 1 – Schematic representation of the type test procedure: (a) measurement cycle
/ (b) example of characteristic curve . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIO INTERFERENCE TEST ON HIGH-VOLTAGE INSULATORS

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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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shall not be held responsible for identifying any or all such patent rights.
IEC 60437 has been prepared by IEC technical committee 36: Insulators. It is an International
Standard.
This third edition cancels and replaces the second edition published in 1997. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Composite station post and composite hollow core station post insulators have been
included;
b) All paragraphs of Samples test were actualized;
c) Sample test fast procedure was introduced.

– 4 – IEC 60437:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
36/585/FDIS 36/591/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
The first edition of IEC 60437 presented the available information on a radio interference test
on high-voltage insulators as a technical report. This allowed further experience in conducting
the test and the interpretation of results to be gained.
The second edition incorporated that experience in the form of an International Standard, which
gave the recommended procedures for a radio interference test on high-voltage insulators.
This third edition incorporates clarification of test arrangements and the number of insulators
to be tested for composite station posts, composite hollow core station posts and hybrid
insulators. This edition also incorporates clarification on the fast method for the sample test.

– 6 – IEC 60437:2023 © IEC 2023
RADIO INTERFERENCE TEST ON HIGH-VOLTAGE INSULATORS

1 Scope
This International Standard specifies the procedure for a radio interference (RI) test carried out
in a laboratory on clean and dry insulators at a frequency of 0,5 MHz or 1 MHz or, alternatively,
at other frequencies between 0,5 MHz and 2 MHz.
This document applies to insulators for use on AC or DC overhead power lines and overhead
traction lines with a nominal voltage greater than 1 000 V.
In service the RI characteristics of an insulator may be modified by the ambient conditions,
particularly rainfall and other moisture, and by pollution. It is not considered feasible to specify
reproducible test conditions to simulate a range of ambient conditions. Hence only tests on
clean and dry insulators are specified in this document.
NOTE The effects of insulator surface conditions, including pollution, are presented in CISPR 18-2:2017,
clause 6.3.
2 Normative references
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.
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60137:2017, Insulated bushings for alternating voltages above 1 000 V
IEC 60168:1994, Tests on indoor and outdoor post insulators of ceramic material or glass for
systems with nominal voltages greater than 1 000 V
IEC 60168:1994/AMD1:1997
IEC 60168:1994/AMD2:2000
IEC 60383-1:2023, Insulators for overhead lines with a nominal voltage above 1 000 V – Part 1:
Ceramic or glass insulator units for a.c. systems – Definitions, test methods and acceptance
criteria
IEC 60383-2:1993, Insulators for overhead lines with a nominal voltage above 1 000 V – Part 2:
Insulator strings and insulator sets for a.c. systems – Definitions, test methods and acceptance
criteria
IEC 61109:2008, Insulators for overhead lines – Composite suspension and tension insulators
for a.c. systems with a nominal voltage greater than 1 000 V – Definitions, test methods and
acceptance criteria
IEC 61462:2007, Composite hollow insulators – Pressurized and unpressurized insulators for
use in electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods,
acceptance criteria and design recommendations
IEC 61952:2008, Insulators for overhead lines – Composite line post insulators for A.C. systems
with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria

IEC 62231:2006, Composite station post insulators for substations with a.c. voltages greater
than 1 000 V up to 245 kV – Definitions, test methods and acceptance criteria
CISPR 16-1-1:2019, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
CISPR 18-2:2017, Radio interference characteristics of overhead power lines and high-voltage
equipment – Part 2: Methods of measurement and procedure for determining limits
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Measurement frequency
The reference measurement frequency is 0,5 MHz. It is recommended that measurements are
made at a frequency of 0,5 MHz ± 10 %. Alternatively, by agreement between purchaser and
manufacturer, other frequencies between 0,5 MHz and 2 MHz may be used.
NOTE Although CISPR 18-2 gives the reference measurement frequency for the measurement of RI characteristics
as 0,5 MHz, the existing standard practice in some countries is to use 1 MHz or 2 MHz when measuring radio
interference characteristics of insulators.
The frequencies of 0,5 MHz or alternatively 1 MHz are preferred because, usually, the level of
radio noise at this part of the spectrum is representative of the higher levels and also because
0,5 MHz lies between the low and medium frequency radio broadcast bands.
The RI characteristics of insulators do not normally affect television broadcasts.
5 Radio noise limits and test voltage
This document does not specify a limiting value for the radio interference characteristic of
insulators or the test voltage.
When RI tests are required, the relevant values shall be found in the relevant IEC standard or
shall be agreed between the purchaser and manufacturer.
NOTE Guidance for establishing limit values is given in CISPR 18-2:2017.
6 Measuring instruments
6.1 Standard CISPR measuring apparatus
Unless otherwise agreed, the standard CISPR measuring apparatus, as specified in
CISPR 16-1-1, shall be used for all measurements of RI characteristics of insulators.

– 8 – IEC 60437:2023 © IEC 2023
6.2 Other measuring apparatus
By agreement between the purchaser and manufacturer measuring apparatus differing from the
CISPR standard measuring apparatus may be used provided that conversion of the
measurements to quasi peak values is possible.
7 Measuring circuit
Laboratory measurements of radio noise shall be made by measuring the conducted quantities,
either current or voltage.
The relevant measuring circuits are specified in CISPR 18-2.
The basic test circuit is shown in Figure 4 of CISPR 18-2:2017, and a practical form of standard
test circuit in Figure 5. For DC insulators tests, H.V. transformer mentioned on both figures shall
be a DC voltage generator. Depending on the distance between the measuring set and the test
circuit, the arrangements shown in Figure 6 or Figure 7 of CISPR 18-2:2017 may be
incorporated into the test circuit of Figure 5.
The test circuit shall be arranged so as to permit an accurate measurement of the radio noise
level generated by the object under test. Any interference from outside the test circuit, including
the supply, or from other parts of the circuit, shall be at a low level and, preferably, at least
10 dB below the level specified for the test object. Also, with the specified test voltage applied
to the circuit, the level of background noise shall be at least 6 dB below the lowest level to be
measured (see 4.5.11 – CISPR 18-2:2017).
8 Requirements for test voltage
RI measurements shall be made with a power-frequency voltage (for AC insulators) or direct
voltage (for DC insulators) applied to the test object. The test voltage and its method of
measurement shall comply with the requirements of IEC 60060-1.
9 Atmospheric conditions
The standard reference atmospheric conditions in accordance with IEC 60060-1 are not
applicable to radio interference tests.
Tests made in accordance with this document shall be performed under atmospheric conditions
complying with the following requirements:
– temperature between 10 °C and 35 °C
– pressure between 87 kPa and 107 kPa (870 mbar and 1 070 mbar)
– relative humidity between 45 % and 75 %.
NOTE The absolute humidity and the atmospheric pressure can influence the test results.
By agreement between the purchaser and manufacturer, e.g. to simulate service conditions,
tests may be carried out under other atmospheric conditions. Examples of these include:
– temperature between 5 °C and 40 °C
– relative humidity between 20 % and 80 %.
Correction to standard atmospheric conditions shall not be applied to either the test voltage or
the radio interference measurements.
The atmospheric conditions shall be recorded.

10 Test area
Tests on smaller insulators and insulator sets preferably shall be performed inside a screened
room which is large enough to prevent the walls and floor having any significant effect on the
distribution of the electric field at the surface of the test object. Circuits, for example power and
lighting, entering the screened test area shall, ideally, be filtered so as to avoid the introduction
of radio noise present in the general environment.
When, for testing larger insulators and insulator sets, a suitable screened room is not available,
the tests may be carried out at any place where the background noise level is sufficiently low
compared with the levels to be measured (see Clause 7).
11 Arrangements of insulators for test
11.1 Mounting of insulators
Insulators, including bushings, shall, when mounted for radio interference tests, be complete
with all stress control devices and fittings specified by the manufacturer or the purchaser. They
shall be mounted either in a standard method of mounting for electrical tests or in a manner
simulating service conditions.
Test results are influenced not only by the insulators, but also by the method of mounting and
the presence of arcing horns, grading rings, conductor bundles and their position relative to the
insulators. Hence a test configuration simulating service conditions shall be as representative
as possible.
NOTE 1 Although measurements of the RI characteristics of an insulator are related to its service voltage, the
standard methods of mounting are referenced to the requirements or otherwise, to switching impulse tests, since RI
measurements are usually made on insulators and insulator sets when they are mounted for other electrical tests,
and service voltage is not normally a specified characteristic of an insulator.
Pin insulators, line post insulators and string insulator units shall be mounted in accordance
with the standard method of mounting given in in the relevant clauses of IEC 60383-1.
For pin and line post insulators, care should be taken to ensure that the high-voltage connection
is sufficiently secure to make a good contact with the ceramic or glass or with the metal end
fittings, thus ensuring freedom from local discharges.
Insulator sets for which switching impulse tests are not required shall be mounted in accordance
with the standard method of mounting given in the relevant clauses of IEC 60383-2. The
mounting arrangement for string insulator units may be applied for short suspension or tension
composite insulators (Length ≤ 0,6m). In case of tests in screened rooms the conductor can be
omitted.
Post insulators for which switching impulse tests are not required shall be mounted in
accordance with the standard method of mounting given in 4.4.1 of IEC 60168:1994.
Bushings for which switching impulse tests are not required shall be mounted in accordance
with the standard method of mounting given in 7.3 of IEC 60137:2017.
Insulator sets, post insulators and bushings for which switching impulse tests are required shall:
– either be mounted in accordance with the standard method of mounting given in the relevant
clauses of IEC 60383-2, IEC 60168 or IEC 60137.
– or be mounted in a manner simulating the service conditions. In this case 12.3 of
IEC 60383-2:1993 or 4.4.3 of IEC 60168:1994 shall apply, as appropriate.
For both methods of mounting care shall be taken to avoid discharges from the high-voltage
conductor assembly.
– 10 – IEC 60437:2023 © IEC 2023
The ends of the assembly shall be protected by suitable corona-free terminations.
Composite station post and composite hollow core station post insulators shall be mounted in
accordance with the standard method of mounting given in the relevant clauses of IEC 62231.
Hybrid insulators shall be mounted, depending on type and application, in accordance with
IEC 606168, IEC 60383-1, IEC 60383-2 or IEC 62155 for the respective kind of products.
11.2 Conditions of insulators before test
Before commencing the radio interference tests the insulators shall be in thermal equilibrium
with the test area to avoid any condensation on their surfaces. The surface of the insulation
part shall be clean and dry before starting high-voltage tests. They may be wiped with a dry
cloth to remove dust and fibres which might affect the surfaces.
11.3 Checking and calibration of test circuit
Before commencing the RI tests the test circuit shall, if necessary, be checked and calibrated
in accordance with 4.5.11 and 4.5.12 of CISPR 18-2:2017.
12 Type test
12.1 Number of insulators
Unless otherwise agreed between the purchaser and manufacturer, the number of insulators
subjected to a radio interference test shall be that mentioned in the relevant IEC standard. If
no mention is made, then the number of insulators shall be the same as the number specified
for the electrical type test in the relevant IEC standard. This requirement is summarized as
follows:
– bushings 1
– Suspension and tension composite 3 (see NOTE 2,3)
insulators L ≤ 600 mm
– Suspension and tension composite 1 (see NOTE 2,3)
insulators L > 600 mm
– line post insulators H ≤ 600 mm 3 (see NOTE 3)
– line post insulators H > 600 mm 1 (see NOTE 3)
– pin insulators 5
– insulator sets 1 (see NOTE 1)
– ceramic or glass insulator units 3
– ceramic or glass post insulators /
composite station post / composite hollow
core station post
H ≤ 600 mm 3 (see NOTE 3)
H > 600 mm 1 (see NOTE 3)
– hybrid insulators depending on type and application, in
accordance with IEC 60168, IEC 60383 or
IEC 62155 for the respective kind of
products.
where
H is the height of the insulator and
L is the distance between metal fittings of the insulator

The requirement and the number of insulators gives priority to product standard.
When more than one insulator of the same design is tested, the RI characteristic should be
given as the mean value of all test results at the specified test voltage.
NOTE 1 Insulator sets completed with their fittings obtain the most representative measurements.
NOTE 2 Not applicable to test insulator alone without all associated fittings or reference conductor bundle etc.
NOTE 3 600 mm length limit on line post insulators are established in order to aligned to IEC 60383-1.
NOTE 4 RIV test on insulator set according to customer design if required by customer specification.
12.2 Voltage application and RI characteristics
The radio noise level generated by a test insulator is not entirely determined by a particular
value of the test voltage. A hysteresis effect often occurs, with the result that the noise may or
may not be present at a given test voltage, since it depends on whether this voltage was reached
by increasing or decreasing values.
Preconditioning of the test insulator, by subjecting it to a voltage which is equal to or greater
than the specified test voltage for a specific period of time, can also have an effect on the
measured level of radio noise.
The following standard procedure shall be adopted.
A voltage 10 % higher than the specified test voltage shall be applied to the insulator under test
and maintained for at least 5 min. The voltage shall then be decreased in steps to 30 % of the
specified test voltage, raised in steps to the initial value, maintained there for 1 min and finally
decreased in steps to the 30 % value. Each voltage step shall be approximately 10 % of the
specified test voltage.
NOTE With an agreement between the manufacturer and the customer, maintaining times in voltage for each level
greater than 5 min can be defined.
At each step, when the value is stable, a radio interference measurement shall be made, and
the results obtained during the last decreasing run shall be plotted against the applied voltage.
The curve so obtained is the RI characteristic of the insulator. Figure 1 shows a schematic
representation of the test procedure.
12.3 Acceptance criterion
The insulator passes the test provided that the RI level at the specified test voltage, as read
from the RI characteristic, does not exceed the specified value or the value previously agreed
between the purchaser and manufacturer.
13 Sample tests
13.1 General
If the purchaser and manufacturer agree to perform RI test on a sample test, this paragraph
specifies selection of samples, an appropriate number of insulators to be tested, the test method
and acceptance criteria.
13.2 Insulators subjected to sample tests
RI tests shall be carried out on samples taken at random from each lot of insulators offered for
acceptance.
– 12 – IEC 60437:2023 © IEC 2023
13.3 Number of samples
Unless otherwise agreed between the purchaser and manufacturer, the number of insulators
subjected to a radio interference test shall be that mentioned in the relevant IEC standard. If no
mention is done, the number of insulators subjected to a radio interference sample test shall be
as follows:
• Sample size as defined in 3.4.1 (Table 1) of IEC 60168:1994.
• E2 as defined in 8.2 of IEC 60383-1:2023.
• E2 as defined in 12.1 (Table 4) of IEC 61109:2008.
• Sample size as defined in 9.1 (Table 4) of IEC 61462:2007.
• E2 as defined in 12.1 (Table 4) of IEC 61952:2008.
• E2 as defined in 10.1 (Table 2) of IEC 62231:2006.
For hybrid insulators, number of samples shall be in accordance with IEC 60168, IEC 60383-1
or IEC 62155 for the respective kind of products.
The requirement and the number of insulators gives priority to product standard.
13.4 Test procedure
The test procedure shall be in accordance with 12.2 and 12.3.
As alternative, the following fast procedure can be applied.
A voltage 10 % higher than the specified test voltage shall be applied to the insulator under test
and maintained for at least 1 min. The voltage shall then be decreased to the specified test
voltage where the result shall be obtained.
NOTE With an agreement between the manufacturer and the customer, maintaining times in voltage greater than
1 min can be defined.
13.5 Acceptance criterion
The insulator batch passes the test provided that RI level on all the samples at the specified
test voltage does not exceed the specified value in the relevant IEC standard (if this value is
specified) or the value previously agreed between the purchaser and manufacturer.
13.6 Re-test procedure
The following re-test procedure applies for the sample test:
If one or more of the sample insulators exhibit an RI level above the specified value, then a
retest in accordance with the appropriate paragraph of the insulator standard shall be
performed.
If it is not mentioned in the standard, then the following procedures shall be applied.
• If only one insulator fails to comply with the sample test, a new sample equal to twice
the quantity originally submitted to that test shall be subjected to re-testing.
• If two or more insulators parts fail to comply with any of the sample tests, or if any failure
occurs during the re-testing, the complete lot is considered as not complying with this
test.
14 Test report
The test report shall contain the following details:
a) name of manufacturer;
b) type designation or description of insulator(s) tested;
c) details of test arrangements including dimensions;
d) atmospheric conditions prevailing during the test (temperature, pressure and relative
humidity);
e) background noise;
f) RI characteristics of insulator tested.

Figure 1 – Schematic representation of the type test procedure:
(a) measurement cycle / (b) example of characteristic curve

___________
– 14 – IEC 60437:2023 © IEC 2023
SOMMAIRE
AVANT-PROPOS . 15
INTRODUCTION . 17
1 Domaine d’application . 18
2 Références normatives . 18
3 Termes et définitions . 19
4 Fréquence de mesure . 19
5 Limites de bruit radioélectrique et tension d’essai . 19
6 Instruments de mesure . 20
6.1 Appareil de mesure normal du CISPR . 20
6.2 Autre appareil de mesure . 20
7 Circuit de mesure . 20
8 Exigences pour la tension d’essai . 20
9 Conditions atmosphériques . 20
10 Zone d’essai . 21
11 Disposition des isolateurs pour l'essai . 21
11.1 Montage des isolateurs . 21
11.2 Conditions des isolateurs avant l'essai . 22
11.3 Vérification et étalonnage du circuit d'essai . 22
12 Essai de type . 23
12.1 Nombre d'isolateurs . 23
12.2 Application de la tension et caractéristiques des perturbations
radioélectriques . 24
12.3 Critère d'acceptation . 24
13 Essais individuels . 24
13.1 Généralités . 24
13.2 Isolateurs soumis à des essais individuels . 24
13.3 Nombre d'échantillons . 25
13.4 Procédure d’essai . 25
13.5 Critère d'acceptation . 25
13.6 Procédure de contre-essai . 25
14 Rapport d’essai . 26

Figure 1 – Représentation schématique de la procédure d'essai de type: (a) cycle de
mesure / (b) exemple de courbe caractéristique . 26

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
ESSAI DE PERTURBATIONS RADIOÉLECTRIQUES
DES ISOLATEURS POUR HAUTE TENSION

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour objet
de favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines
de l'électricité et de l'électronique. À cet effet, l’IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et
des Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des comités d'études,
aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent également
aux travaux. L’IEC collabore étroitement avec l'Organisation Internationale de Normalisation (ISO), selon
des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l’IEC concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l’IEC
intéressés sont représentés dans chaque comité d’études.
3) Les Publications de l'IEC se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de l'IEC. Tous les efforts raisonnables sont entrepris afin que l’IEC
s'assure de l'exactitude du contenu technique de ses publications; l’IEC ne peut pas être tenue responsable
de l'éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de l’IEC s'engagent, dans toute
la mesure possible, à appliquer de façon transparente les Publications de l’IEC dans leurs publications nationales
et régionales. Toutes divergences entre toutes Publications de l'IEC et toutes publications nationales ou
régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L’IEC elle-même ne fournit aucune attestation de conformité. Des organismes de certification indépendants
fournissent des services d'évaluation de conformité et, dans certains secteurs, accèdent aux marques
de conformité de l’IEC. L’IEC n'est responsable d'aucun des services effectués par les organismes de certification
indépendants.
6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à l’IEC, à ses administrateurs, employés, auxiliaires ou mandataires,
y compris ses experts particuliers et les membres de ses comités d'études et des Comités nationaux de l’IEC,
pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre dommage de quelque
nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais de justice) et les dépenses
découlant de la publication ou de l'utilisation de cette Publication de l’IEC ou de toute autre Publication de l’IEC,
ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’IEC attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’IEC ne prend pas position quant à la preuve, à la validité et à l’applicabilité de tout
droit de propriété revendiqué à cet égard. À la date de publication du présent document, l’IEC n’avait pas reçu
notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
d’avertir les responsables de la mise en application du présent document que des informations plus récentes
sont suscepti
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