EN IEC 60216-5:2022

SLOVENSKI STANDARD
01-februar-2023
Nadomešča:
SIST EN 60216-5:2008
Električni izolacijski materiali - Lastnosti toplotne vzdržljivosti - 5. del:
Ugotavljanje indeksa relativne toplotne vzdržljivosti (RTI) izolacijskega materiala
(IEC 60216-5:2022)
Electrical insulating materials - Thermal endurance properties - Part 5: Determination of
relative temperature index (RTI) of an insulating material (IEC 60216-5:2022)
Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens - Teil
5: Bestimmung des relativen Temperaturindexes (RTI) von Elektroisolierstoffen (IEC
60216-5:2022)
Matériaux isolants électriques - Propriétés d'endurance thermique - Partie 5:
Détermination de l’indice de température relatif (ITR) d’un matériau isolant (IEC 60216-
5:2022)
Ta slovenski standard je istoveten z: EN IEC 60216-5:2022
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60216-5

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2022
ICS 19.020; 29.020; 29.035.01 Supersedes EN 60216-5:2008
English Version
Electrical insulating materials - Thermal endurance properties -
Part 5: Determination of relative temperature index (RTI) of an
insulating material
(IEC 60216-5:2022)
Matériaux isolants électriques - Propriétés d'endurance Elektroisolierstoffe - Eigenschaften hinsichtlich des
thermique - Partie 5: Détermination de l'indice de thermischen Langzeitverhaltens - Teil 5: Bestimmung des
température relatif (ITR) d'un matériau isolant relativen Temperaturindexes (RTI) von Elektroisolierstoffen
(IEC 60216-5:2022) (IEC 60216-5:2022)
This European Standard was approved by CENELEC on 2022-12-22. 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,
Türkiye 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 60216-5:2022 E

European foreword
The text of document 112/582/FDIS, future edition 4 of IEC 60216-5, prepared by IEC/TC 112
"Evaluation and qualification of electrical insulating materials and systems" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 60216-5:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-09-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-12-22
document have to be withdrawn
This document supersedes EN 60216-5:2008 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 is read in conjunction with EN 60216-1:2013, EN 60216-2:2005 and
EN IEC 60216-3:2021.
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 60216-5:2022 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 60085 NOTE Harmonized as EN 60085
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 60216-1 2013 Electrical insulating materials - Thermal EN 60216-1 2013
endurance properties - Part 1: Ageing
procedures and evaluation of test results
IEC 60216-2 2005 Electrical insulating materials - Thermal EN 60216-2 2005
endurance properties - Part 2: Determination
of thermal endurance properties of electrical
insulating materials - Choice of test criteria
IEC 60216-3 2021 Electrical insulating materials - Thermal EN IEC 60216-3 2021
endurance properties - Part 3: Instructions for
calculating thermal endurance characteristics
IEC 60216-5 ®
Edition 4.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical insulating materials – Thermal endurance properties –

Part 5: Determination of relative temperature index (RTI) of an insulating material

Matériaux isolants électriques – Propriétés d'endurance thermique –

Partie 5: Détermination de l’indice de température relatif (ITR) d’un matériau

isolant
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.020; 29.020; 29.035.01 ISBN 978-2-8322-6014-2

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CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and units . 7
3.1 Terms and definitions. 7
3.2 Symbols and units . 8
4 Objectives of RTI determination . 10
5 Experimental procedures . 10
5.1 Selection of reference EIM . 10
5.2 Selection of diagnostic test for extent of ageing . 10
5.3 Ageing procedures . 10
6 Calculation procedures . 11
6.1 Thermal endurance data – Calculation of intermediate parameters . 11
6.2 Calculation of RTI . 12
6.3 Statistical and numerical tests . 13
6.3.1 Tests of IEC 60216-3 . 13
6.3.2 Precision of correlation time . 13
6.3.3 Lower confidence interval of RTI. 13
6.3.4 Extrapolation . 14
7 Results and report . 14
7.1 Results of statistical and numerical tests . 14
7.2 Results . 14
7.3 Report . 15
8 Material testing by short-term thermal ageing . 15
9 Insulation classification. 16
Annex A (informative) Repeatability of correlation time . 17
A.1 Overview . 17
A.2 F-test for linearity . 17
A.3 Standard error of the difference of two means . 17
A.4 Student’s t-test for difference of two means . 18
A.5 Combination of data . 19
Annex B (informative) Thermal class assignment . 20
Annex C (informative) Computer program . 23
C.1 General . 23
C.1.1 Overview . 23
C.1.2 Convenience program execution . 24
C.2 Structure of data files used by the program . 25
C.3 Executing the calculation of RTI . 26
C.4 Output files and graph. 26
Annex D (informative) Selection of the reference EIM . 28
D.1 Overview . 28
D.2 Designation of reference EIM . 28
D.3 Reporting items for reference EIM. 28
Bibliography . 29

IEC 60216-5:2022 © IEC 2022 – 3 –
Figure 1 – Thermal endurance graphs. 11
Figure 2 – Unacceptable thermal endurance graphs . 11
Figure C.1 – Shortcut property dialog for program launch . 25
Figure C.2 – Thermal endurance graphs . 26
Figure C.3 – Example thermal endurance graphs . 27

Table 1 – Input parameters for the calculations concerning RTI . 12
Table B.1 – Thermal class equivalents for insulating material . 20
Table B.2 – F– function; p = 0,05 . 21
Table B.3 – t–function . 22

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 5: Determination of relative
temperature index (RTI) of an insulating material

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 standard
...