EN IEC 62631-3-2:2023

SLOVENSKI STANDARD
01-februar-2024
Dielektrične in uporovne lastnosti trdnih izolacijskih materialov - 3-2. del:
Ugotavljanje uporovnih lastnosti (metode z enosmernim tokom) - Površinska
upornost in površinska specifična upornost (IEC 62631-3-2:2023)
Dielectric and resistive properties of solid insulating materials - Part 3-2: Determination of
resistive properties (DC methods) - Surface resistance and surface resistivity (IEC 62631
-3-2:2023)
Dielektrische und resistive Eigenschaften fester Isolierstoffe - Teil 3-2: Bestimmung
resistiver Eigenschaften (Gleichspannungsverfahren) - Oberflächenwiderstand und
spezifischer Oberflächenwiderstand (IEC 62631-3-2:2023)
Propriétés diélectriques et résistives des matériaux isolants solides - Partie 3-2:
Détermination des propriétés résistives (méthodes en courant continu) - Résistance
superficielle et résistivité superficielle (IEC 62631-3-2:2023)
Ta slovenski standard je istoveten z: EN IEC 62631-3-2:2023
ICS:
17.220.99 Drugi standardi v zvezi z Other standards related to
elektriko in magnetizmom electricity and magnetism
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 62631-3-2

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2023
ICS 17.220.99; 29.035.01 Supersedes EN 62631-3-2:2016
English Version
Dielectric and resistive properties of solid insulating materials -
Part 3-2: Determination of resistive properties (DC methods) -
Surface resistance and surface resistivity
(IEC 62631-3-2:2023)
Propriétés diélectriques et résistives des matériaux isolants Dielektrische und resistive Eigenschaften fester Isolierstoffe
solides - Partie 3-2: Détermination des propriétés résistives - Teil 3-2: Bestimmung resistiver Eigenschaften
(méthodes en courant continu) - Résistance superficielle et (Gleichspannungsverfahren) - Oberflächenwiderstand und
résistivité superficielle spezifischer Oberflächenwiderstand
(IEC 62631-3-2:2023) (IEC 62631-3-2:2023)
This European Standard was approved by CENELEC on 2023-11-20. 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62631-3-2:2023 E

European foreword
The text of document 112/612/FDIS, future edition 2 of IEC 62631-3-2, 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 62631-3-2:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-08-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-11-20
document have to be withdrawn
This document supersedes EN 62631-3-2:2016 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.
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 62631-3-2:2023 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 standard indicated:
IEC 60893-2 NOTE Approved as EN 60893-2
IEC 61212-2 NOTE Approved as EN 61212-2
IEC 62011-2 NOTE Approved as EN 62011-2
ISO 10350 (series) NOTE Approved as EN ISO 10350 (series)
ISO 10350-1 NOTE Approved as EN ISO 10350-1
ISO 10350-2 NOTE Approved as EN ISO 10350-2
ISO 14526 (series) NOTE Approved as EN ISO 14526 (series)
ISO 14527 (series) NOTE Approved as EN ISO 14527 (series)
ISO 14528 (series) NOTE Approved as EN ISO 14528 (series)
ISO 14529 (series) NOTE Approved as EN ISO 14529 (series)
ISO 14530 (series) NOTE Approved as EN ISO 14530 (series)
ISO 15252 (series) NOTE Approved as EN ISO 15252 (series)
ISO 15512 NOTE Approved as EN ISO 15512
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60212 - Standard conditions for use prior to and EN 60212 -
during the testing of solid electrical
insulating materials
IEC 62631-3-1 - Dielectric and resistive properties of solid EN IEC 62631-3-1 -
insulating materials - Part 3-1:
Determination of resistive properties (DC
methods) - Volume resistance and volume
resistivity - General method
IEC 62631-3-3 - Dielectric and resistive properties of solid EN 62631-3-3 -
insulating materials - Part 3-3:
Determination of resistive properties (DC
methods) - Insulation resistance

IEC 62631-3-2 ®
Edition 2.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dielectric and resistive properties of solid insulating materials –
Part 3-2: Determination of resistive properties (DC methods) – Surface
resistance and surface resistivity
Propriétés diélectriques et résistives des matériaux isolants solides –
Partie 3-2: Détermination des propriétés résistives (méthodes en courant
continu) – Résistance superficielle et résistivité superficielle
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99, 29.035.01 ISBN 978-2-8322-7549-8
– 2 – IEC 62631-3-2:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Significance . 8
5 Method of test . 8
5.1 General . 8
5.2 Voltage . 9
5.3 Equipment . 9
5.3.1 General . 9
5.3.2 Accuracy . 9
5.3.3 Voltage source . 10
5.3.4 Electrode arrangements . 10
5.4 Test circuit . 14
5.5 Calibration . 15
5.6 Test specimen . 15
5.6.1 Recommended dimensions of test specimen and electrode
arrangements . 15
5.6.2 Manufacturing of test specimen . 15
5.6.3 Number of test specimens . 16
5.6.4 Application of conductive means . 16
5.6.5 Conditioning and pre-treatment of test specimen . 16
5.7 Test procedure . 17
6 Calculation of surface resistivity . 17
6.1 For electrode arrangements A, B, D and E . 17
6.2 For electrode arrangement C . 17
7 Test report . 18
8 Repeatability and reproducibility . 18
Annex A (informative) Specimen dimensions and electrode arrangements . 19
Annex B (informative) Comparative verification study on surface resistivities using
different electrode arrangements (type C and type E) . 20
B.1 General . 20
B.2 Inter-laboratory trial conditions . 20
B.2.1 General . 20
B.2.2 Test specimens . 20
B.2.3 Electrode types, conductive materials and test voltage . 20
B.2.4 Test conditions . 21
B.3 Summary of the test results . 21
B.4 Inter-laboratory trial outcomes and suggestions for IEC 62631-3-2 . 22
B.5 Detailed inter-laboratory results . 22
B.5.1 General . 22
B.5.2 Laboratories results by different groups of electrode types and
conductive materials for the different test specimens . 23
B.5.3 Laboratory 2 results comparing different electrode types and conductive
materials . 29
B.5.4 Laboratory 3 results – Electrode type C with and without use of
conductive silver paint . 31

IEC 62631-3-2:2023 © IEC 2023 – 3 –
Bibliography . 33

Figure 1 – Electrode arrangement A (example) . 11
Figure 2 – Electrode arrangement B (example) . 12
Figure 3 – Electrode arrangement C (example) . 13
Figure 4 – Connection diagram of measurement with two- and three-terminal electrode
arrangements. 15
Figure B.1 – Surface resistivity equations for the
...