EN IEC 62660-2:2019

Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 2: Reliability and abuse testing

This part of IEC 62660 specifies test procedures to observe the reliability and abuse behaviour of secondary lithium-ion cells and cell blocks used for propulsion of electric vehicles including battery electric vehicles (BEV) and hybrid electric vehicles (HEV). NOTE 1 Secondary lithium-ion cells used for propulsion of plug-in hybrid electric vehicles (PHEV) can be tested by the procedure either for BEV application or HEV application, according to the battery system design, based on the agreement between the cell manufacturer and the customer. This document specifies the standard test procedures and conditions for basic characteristics of lithium-ion cells for use in propulsion of battery and hybrid electric vehicles. The tests are indispensable for obtaining essential data on reliability and abuse behaviour of lithium-ion cells for use in various designs of battery systems and battery packs. This document provides standard classification of description of test results to be used for the design of battery systems or battery packs. NOTE 2 Cell blocks can be used as an alternative to cells according to the agreement between the cell manufacturer and the customer. NOTE 3 The safety requirements of lithium-ion cells for electric vehicle application are defined in IEC 62660-3 [3].

Lithium-Ionen-Sekundärzellen für den Antrieb von Elektrostraßenfahrzeugen - Teil 2: Zuverlässigkeits- und Missbrauchsprüfung

Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers électriques - Partie 2: Essais de fiabilité et de traitement abusif

La présente partie de l’IEC 62660 spécifie les procédures d'essai destinées à observer la fiabilité et le comportement sous traitement abusif des éléments et des blocs d’éléments d’accumulateurs lithium-ion utilisés pour la propulsion des véhicules électriques, y compris les véhicules électriques à batterie (BEV) et les véhicules électriques hybrides (HEV). NOTE 1 Les éléments d’accumulateurs lithium-ion pour la propulsion des véhicules électriques hybrides rechargeables (PHEV) peuvent être soumis à l’essai avec la procédure pour application BEV ou pour application HEV, selon la conception des systèmes de batteries, sur la base de l’accord entre le fabricant de l’élément et le client. Le présent document spécifie les procédures et les conditions d'essai normalisées pour des caractéristiques fondamentales des éléments lithium-ion utilisés pour la propulsion des véhicules électriques à batterie d’accumulateurs et hybrides. Les essais sont indispensables pour obtenir des données importantes sur la fiabilité et sur le comportement sous traitement abusif des éléments lithium-ion utilisés dans différentes conceptions de systèmes de batteries et de packs de batteries. Le présent document donne une classification normalisée de la description des résultats d'essai à utiliser pour la conception des systèmes de batteries et des packs de batteries. NOTE 2 Des blocs d’éléments peuvent être utilisés à la place d’éléments conformément à l’accord entre le fabricant de l’élément et le client. NOTE 3 Les exigences de sécurité des éléments lithium-ion pour application aux véhicules électriques sont définies dans l’IEC 62660-3 [3].

Sekundarni litij-ionski členi za pogon električnih cestnih vozil - 2. del: Preskušanje zanesljivosti in izrabljivosti

Ta del standarda IEC 62660 določa preskusne postopke za preskušanje zanesljivosti in izrabljivosti sekundarnih litij-ionskih členov in blokov členov, ki se uporabljajo za pogon električnih vozil, vključno z električnimi akumulatorskimi vozili (BEV) in hibridnimi električnimi vozili (HEV).
OPOMBA 1: Sekundarne litij-ionske člene za pogon priključnega hibridnega električnega vozila (PHEV) je mogoče preskusiti s postopkom uporabe električnih akumulatorskih vozil ali hibridnih električnih vozil v skladu z zasnovo baterijskega sistema na podlagi dogovora med proizvajalcem členov in kupcem.
Ta dokument določa standardne preskusne postopke in pogoje za osnovne lastnosti litij-ionskih členov za uporabo pri pogonu akumulatorskih in hibridnih električnih vozil. Preskusi so nepogrešljivi za pridobivanje osnovnih podatkov o zanesljivosti in izrabljivosti litij-ionskih členov za uporabo v različnih izvedbah baterijskih sistemov in akumulatorjev.
Ta dokument podaja standardno klasifikacijo opisa rezultatov preskušanj, ki se uporablja za načrtovanje baterijskih sistemov in akumulatorjev.
OPOMBA 2: Kot alternativa členom se lahko v skladu z dogovorom med proizvajalcem in kupcem uporabijo bloki členov.
OPOMBA 3: Varnostne zahteve za litij-ionske akumulatorje in sisteme za električna vozila so določene v standardu IEC 62660-3 [3].

General Information

• Status: Published
• Publication Date: 14-Feb-2019
• Withdrawal Date: 15-Jan-2022
• ICS: 29.220.20 - Acid secondary cells and batteries
• ICS: 43.120 - Electric road vehicles
• Technical Committee: CLC/TC 21X - Secondary cells and batteries
• Drafting Committee: IEC/TC 21 - IEC_TC_21
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 15-Feb-2019
• Completion Date: 15-Feb-2019
• Ref Project: SIST EN IEC 62660-2:2019 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 2: Reliability and abuse testing

Relations

• Replaces: EN 62660-2:2011 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 2: Reliability and abuse testing
• Effective Date: 17-Oct-2017

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62660-2:2019
01-maj-2019
1DGRPHãþD
SIST EN 62660-2:2011
6HNXQGDUQLOLWLMLRQVNLþOHQL]DSRJRQHOHNWULþQLKFHVWQLKYR]LOGHO3UHVNXãDQMH
]DQHVOMLYRVWLLQL]UDEOMLYRVWL
Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 2: Reliability
and abuse testing
Lithium-Ionen-Sekundärzellen für den Antrieb von Elektrostraßenfahrzeugen - Teil 2:
Zuverlässigkeits- und Missbrauchsprüfung
Eléments d'accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques - Partie 2: Essais de fiabilité et de traitement abusif
Ta slovenski standard je istoveten z: EN IEC 62660-2:2019
ICS:
29.220.20 .LVOLQVNLVHNXQGDUQLþOHQLLQ Acid secondary cells and
EDWHULMH batteries
43.120 (OHNWULþQDFHVWQDYR]LOD Electric road vehicles
SIST EN 62660-2:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 62660-2:2019
SIST EN 62660-2:2019
EUROPEAN STANDARD EN IEC 62660-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.220.20; 43.120 Supersedes EN 62660-2:2011
English Version
Secondary lithium-ion cells for the propulsion of electric road
vehicles - Part 2: Reliability and abuse testing
(IEC 62660-2:2018)
Éléments d'accumulateurs lithium-ion pour la propulsion Sekundärbatterien für den Antrieb von
des véhicules routiers électriques - Partie 2: Essais de Elektrostraßenfahrzeugen - Teil 2: Zuverlässigkeits- und
fiabilité et de traitement abusif Missbrauchsprüfung von Lithium-Ionen-Zellen
(IEC 62660-2:2018) (IEC 62660-2:2018)
This European Standard was approved by CENELEC on 2019-01-16. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62660-2:2019 E

SIST EN 62660-2:2019
European foreword
The text of document 21/976/FDIS, future edition 2 of IEC 62660-2, prepared by IEC/TC 21
"Secondary cells and batteries" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62660-2:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-10-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-01-16
document have to be withdrawn
This document supersedes EN 62660-2:2011.
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.

Endorsement notice
The text of the International Standard IEC 62660-2:2018 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 62660-1 NOTE Harmonized as EN 62660-1
NOTE Harmonized as EN 62660-3
IEC 62660-3
IEC 61434:1996 NOTE Harmonized as EN 61434:1996 (not modified)

SIST EN 62660-2:2019
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 60068-2-64 -  Environmental testing - Part 2-64: Tests - Test Fh: EN 60068-2-64 -
Vibration, broadband random and guidance
ISO 16750-3 -  Road vehicles - Environmental conditions and - -
testing for electrical and electronic equipment - Part
3: Mechanical loads
ISO 16750-4 -  Road vehicles - Environmental conditions and - -
testing for electrical and electronic equipment - Part
4: Climatic loads
ISO/TR 8713 -  Electrically propelled road vehicles - Vocabulary - -

SIST EN 62660-2:2019
SIST EN 62660-2:2019
IEC 62660-2 ®
Edition 2.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 2: Reliability and abuse testing
Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques –
Partie 2: Essais de fiabilité et de traitement abusif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20; 43.120 ISBN 978-2-8322-6289-4
SIST EN 62660-2:2019
– 2 – IEC 62660-2:2018 © IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test conditions . 8
4.1 General . 8
4.2 Measuring instruments . 8
4.2.1 Range of measuring devices . 8
4.2.2 Voltage measurement . 8
4.2.3 Current measurement . 8
4.2.4 Temperature measurements . 8
4.2.5 Other measurements . 9
4.3 Tolerance . 9
4.4 Thermal stabilization . 9
5 Electrical measurement . 9
5.1 General charge conditions . 9
5.2 Capacity . 10
5.3 SOC adjustment . 10
6 Reliability and abuse tests . 10
6.1 General . 10
6.2 Mechanical test . 11
6.2.1 Vibration . 11
6.2.2 Mechanical shock . 12
6.2.3 Crush . 13
6.3 Thermal test . 14
6.3.1 High temperature endurance. 14
6.3.2 Temperature cycling . 14
6.4 Electrical test . 15
6.4.1 External short circuit . 15
6.4.2 Overcharge . 16
6.4.3 Forced discharge . 16
7 Description of test results . 16
Annex A (informative) Selective test conditions . 18
Bibliography . 19

Figure 1 – Example of temperature measurement of cell . 9
Figure 2 – PSD of acceleration plotted against frequency . 11
Figure 3 – Examples of crush test . 13

Table 1 – Discharge conditions . 10
Table 2 – Values for PSD and frequency . 12
Table 3 – Mechanical shock test – parameters . 12
Table 4 – Temperatures and time duration for temperature cycling . 15
Table 5 – Test result description . 17
Table A.1 – Capacity test conditions . 18

SIST EN 62660-2:2019
IEC 62660-2:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY LITHIUM-ION CELLS FOR
THE PROPULSION OF ELECTRIC ROAD VEHICLES –

Part 2: Reliability and abuse testing

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
...

SLOVENSKI STANDARD
01-maj-2019
Nadomešča:
SIST EN 62660-2:2011
Sekundarni litij-ionski členi za pogon električnih cestnih vozil - 2. del: Preskušanje
zanesljivosti in izrabljivosti
Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 2: Reliability
and abuse testing
Lithium-Ionen-Sekundärzellen für den Antrieb von Elektrostraßenfahrzeugen - Teil 2:
Zuverlässigkeits- und Missbrauchsprüfung
Eléments d'accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques - Partie 2: Essais de fiabilité et de traitement abusif
Ta slovenski standard je istoveten z: EN IEC 62660-2:2019
ICS:
29.220.20 Kislinski sekundarni členi in Acid secondary cells and
baterije batteries
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62660-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.220.20; 43.120 Supersedes EN 62660-2:2011
English Version
Secondary lithium-ion cells for the propulsion of electric road
vehicles - Part 2: Reliability and abuse testing
(IEC 62660-2:2018)
Éléments d'accumulateurs lithium-ion pour la propulsion Sekundärbatterien für den Antrieb von
des véhicules routiers électriques - Partie 2: Essais de Elektrostraßenfahrzeugen - Teil 2: Zuverlässigkeits- und
fiabilité et de traitement abusif Missbrauchsprüfung von Lithium-Ionen-Zellen
(IEC 62660-2:2018) (IEC 62660-2:2018)
This European Standard was approved by CENELEC on 2019-01-16. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62660-2:2019 E

European foreword
The text of document 21/976/FDIS, future edition 2 of IEC 62660-2, prepared by IEC/TC 21
"Secondary cells and batteries" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62660-2:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-10-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-01-16
document have to be withdrawn
This document supersedes EN 62660-2:2011.
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.

Endorsement notice
The text of the International Standard IEC 62660-2:2018 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 62660-1 NOTE Harmonized as EN 62660-1
NOTE Harmonized as EN 62660-3
IEC 62660-3
IEC 61434:1996 NOTE Harmonized as EN 61434:1996 (not modified)

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 60068-2-64 -  Environmental testing - Part 2-64: Tests - Test Fh: EN 60068-2-64 -
Vibration, broadband random and guidance
ISO 16750-3 -  Road vehicles - Environmental conditions and - -
testing for electrical and electronic equipment - Part
3: Mechanical loads
ISO 16750-4 -  Road vehicles - Environmental conditions and - -
testing for electrical and electronic equipment - Part
4: Climatic loads
ISO/TR 8713 -  Electrically propelled road vehicles - Vocabulary - -

IEC 62660-2 ®
Edition 2.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 2: Reliability and abuse testing
Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques –
Partie 2: Essais de fiabilité et de traitement abusif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20; 43.120 ISBN 978-2-8322-6289-4
– 2 – IEC 62660-2:2018 © IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test conditions . 8
4.1 General . 8
4.2 Measuring instruments . 8
4.2.1 Range of measuring devices . 8
4.2.2 Voltage measurement . 8
4.2.3 Current measurement . 8
4.2.4 Temperature measurements . 8
4.2.5 Other measurements . 9
4.3 Tolerance . 9
4.4 Thermal stabilization . 9
5 Electrical measurement . 9
5.1 General charge conditions . 9
5.2 Capacity . 10
5.3 SOC adjustment . 10
6 Reliability and abuse tests . 10
6.1 General . 10
6.2 Mechanical test . 11
6.2.1 Vibration . 11
6.2.2 Mechanical shock . 12
6.2.3 Crush . 13
6.3 Thermal test . 14
6.3.1 High temperature endurance. 14
6.3.2 Temperature cycling . 14
6.4 Electrical test . 15
6.4.1 External short circuit . 15
6.4.2 Overcharge . 16
6.4.3 Forced discharge . 16
7 Description of test results . 16
Annex A (informative) Selective test conditions . 18
Bibliography . 19

Figure 1 – Example of temperature measurement of cell . 9
Figure 2 – PSD of acceleration plotted against frequency . 11
Figure 3 – Examples of crush test . 13

Table 1 – Discharge conditions . 10
Table 2 – Values for PSD and frequency . 12
Table 3 – Mechanical shock test – parameters . 12
Table 4 – Temperatures and time duration for temperature cycling . 15
Table 5 – Test result description . 17
Table A.1 – Capacity test conditions . 18

IEC 62660-2:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY LITHIUM-ION CELLS FOR
THE PROPULSION OF ELECTRIC ROAD VEHICLES –

Part 2: Reliability and abuse testing

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
a
...