IEC 61238-1-2:2018
(Main)Compression and mechanical connectors for power cables - Part 1-2: Test methods and requirements for insulation piercing connectors for power cables for rated voltages up to 1 kV (Um = 1,2 kV) tested on insulated conductors
Compression and mechanical connectors for power cables - Part 1-2: Test methods and requirements for insulation piercing connectors for power cables for rated voltages up to 1 kV (U<sub>m</sub> = 1,2 kV) tested on insulated conductors
IEC 61238-1-2:2018 applies to insulation piercing connectors for power cables for rated voltages up to 1 kV (Um = 1,2 kV), for example according to IEC 60502-1 or other buried cables and cables installed in buildings, having
a) conductors complying with IEC 60228 having nominal cross-sectional areas between 2,5 mm2 and 300 mm2 for copper and between 16 mm2 and 500 mm2 for aluminium,
b) a maximum continuous cable temperature not exceeding the insulation material properties.
This document is not applicable to connectors for overhead line conductors nor to connectors with a sliding contact.
The object of this document is to define the type test methods and requirements, which apply to insulation piercing connectors for power cables with copper or aluminium conductors. The reference method is to perform the tests on unused insulated conductors.
This first edition, together with IEC 61238-1-1 and IEC 61238-1-3, cancels and replaces IEC 61238-1:2003.
This edition includes the following significant technical changes with respect to IEC 61238-1:2003:
a) The scope has been widened to cover connectors for conductors from 10 mm2 down to 2,5 mm2 and has been limited to 300 mm2 for copper conductors and 500 mm2 for aluminium conductors because test experience and applications for IPC are rare for conductors of larger cross-sectional areas.
b) A new mechanical class has been introduced to satisfy the demand for connectors subjected to no mechanical force.
c) The electrical test method has been updated in order to take into consideration the temperature of the insulated reference conductors.
d) For the short-circuit test, the method of calculation and requirements have been updated.
e) For the mechanical test, the methods and requirements have been updated.
f) Different test proposals for multicore connector testing have been introduced.
g) A test proposal for pre-conditioning using live load pickup for insulation piercing connectors has been introduced.
Raccords sertis et à serrage mécanique pour câbles d'énergie – Partie 1-2: Méthodes et exigences d’essai relatives aux raccords à perforation d’isolant pour câbles d’énergie de tensions assignées inférieures ou égales à 1 kV (<em>U</em><sub>m</sub> = 1,2 kV) soumis à essai sur des conducteurs isolés
L’IEC 61238-1-2:2018 est applicable aux raccords à perforation d’isolant pour câbles d'énergie de tensions assignées inférieures ou égales à 1 kV (Um = 1,2 kV), par exemple pour les câbles définis dans l’IEC 60502-1 ou d’autres câbles enterrés et ceux installés à l'intérieur des bâtiments, ayant
a) des âmes conformes à l’IEC 60228, de section nominale comprise entre 2,5 mm2 et 300 mm2 pour le cuivre et entre 16 mm2 et 500 mm2 pour l’aluminium,
b) une température maximale de fonctionnement en service permanent ne dépassant pas les propriétés du matériau isolant.
Le présent document n'est pas applicable aux raccords pour conducteurs de ligne aérienne ni aux raccords équipés d’un contact glissant.
L'objet du présent document est de définir les méthodes d'essais de type et les exigences qui s’appliquent aux raccords à perforation d’isolant utilisables sur les câbles d'énergie à conducteurs en cuivre ou en aluminium. La méthode de référence consiste à réaliser les essais sur des conducteurs isolés neufs.
Cette première édition, conjointement avec l'IEC 61238-1-1 et l'IEC 61238-1-3, annule et remplace l'IEC 61238-1:2003.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC 61238-1:2003:
a) Le domaine d’application a été élargi pour couvrir les raccords de connexion pour âmes jusqu’à 2,5 mm2 (précédemment 10 mm2); il a été limité à 300 mm2 pour les âmes en cuivre et à 500 mm2 pour les âmes en aluminium car les expériences et applications d’essai des raccords à perforation d’isolant sont rares pour les âmes de fortes sections.
b) Une nouvelle classe mécanique a été introduite pour répondre à la demande concernant les raccords qui ne sont soumis à aucune force mécanique.
c) La méthode de réalisation de l’essai électrique a été mise à jour afin de prendre en compte la température des conducteurs de référence isolés.
d) Pour l’essai de court-circuit, la méthode de calcul et les exigences ont été mises à jour.
e) Pour l’essai mécanique, les méthodes et exigences ont été mises à jour.
f) Des propositions d’essai différentes pour les essais sur les raccords multipolaires ont été introduites.
g) Une proposition d’essai applicable au préconditionnement, utilisant une connexion en charge pour les raccords à perforation d’isolant, a été introduite.
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IEC 61238-1-2 ®
Edition 1.0 2018-05
INTERNATIONAL
STANDARD
Compression and mechanical connectors for power cables –
Part 1-2: Test methods and requirements for insulation piercing connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on insulated
m
conductors
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
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IEC 61238-1-2 ®
Edition 1.0 2018-05
INTERNATIONAL
STANDARD
Compression and mechanical connectors for power cables –
Part 1-2: Test methods and requirements for insulation piercing connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on insulated
m
conductors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-5646-6
– 2 – IEC 61238-1-2:2018 © IEC 2018
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols . 10
5 General . 11
5.1 Definition of classes . 11
5.2 Cable . 11
5.3 Connectors and installation procedure . 12
5.4 Range of approval. 12
6 Electrical tests . 13
6.1 Installation . 13
6.1.1 General . 13
6.1.2 Through connectors . 13
6.1.3 Branch connectors . 14
6.2 Measurements . 14
6.2.1 General . 14
6.2.2 Electrical resistance measurements . 14
6.2.3 Temperature measurements . 15
6.3 Heat cycling test . 16
6.3.1 General . 16
6.3.2 First heat cycle . 16
6.3.3 Second heat cycle . 16
6.3.4 Subsequent heat cycles . 18
6.4 Short-circuit test for connectors according to Class A . 18
6.5 Assessment of results . 19
6.6 Requirements . 19
6.7 Examples of electrical test loop configurations and associated parameters . 20
7 Mechanical test . 24
7.1 General . 24
7.2 Method . 24
7.3 Requirements . 24
8 Test reports . 24
8.1 General . 24
8.2 Electrical tests . 24
8.3 Mechanical test . 25
Annex A (normative) Equalizers and their preparation . 26
A.1 Requirements for equalizers . 26
A.2 Recommendations for welding equalizers . 26
Annex B (normative) Measurements . 28
B.1 Potential measuring positions for typical connectors . 28
B.2 Temperature measurement . 28
B.3 Equivalent conductor resistance . 28
Annex C (informative) Recommendations to decrease uncertainties of measurement . 29
C.1 Handling the test loop . 29
C.2 Measurements, instruments and readings . 29
Annex D (normative) Calculation of adiabatic short-circuit current . 30
Annex E (informative) Determination of the value of the short-circuit current . 31
Annex F (normative) Calculation method . 32
F.1 General . 32
F.2 Measurements made . 32
F.3 Connector resistance factor k . 32
F.4 Initial scatter δ . 33
F.5 Mean scatter β . 33
F.6 Change in resistance factor of each connector . 35
F.6.1 General . 35
F.6.2 Line of best fit . 35
F.6.3 Confidence interval δ . 35
i
F.6.4 Change in resistance factor D . 36
F.7 Resistance factor ratio λ. 36
F.8 Maximum temperatures θ . 36
max
Annex G (informative) Explanation on assessment of results of electrical tests on
connectors . 37
G.1 History . 37
G.2 Short examination of the assessment methods of IEC 61238-1 compared
with the Italian standard CEI 20-28 and the British standard BS 4579-3 . 37
G.3 The IEC 61238-1 method of assessing test results . 38
Annex H (informative) Tests on multicore connectors . 40
H.1 Principle . 40
H.1.1 Electrical tests . 40
H.1.2 Mechanical tests . 40
H.2 Test recommendations for electrical tests based on test experience in the
UK and in France . 40
H.2.1 General . 40
H.2.2 Measurement . 41
H.2.3 Heat cycling test . 41
H.2.4 Short-circuit test (only for Class A) . 41
H.2.5 Results evaluation . 42
H.3 Test recommendations for electrical tests based on German standard
DIN VDE 0220- 3 . 43
H.3.1 General . 43
H.3.2 Test setup for electrical test . 44
H.3.3 Resistance assessment branches of the test setup . 45
H.3.4 Temperature measurement in a separate test branch during the first
and second heat-cycle . 45
H.3.5 Interconnection of terminals for heat-cycling . 47
H.3.6 Short-circuit tests . 49
H.3.7 Assessment of resistance-values R . 51
j
H.3.8 Optional dielectric strength test after the electrical test . 52
Annex I (informative) Load pick-up tests . 54
Bibliography . 55
Figure 1 – Position of thermocouples .
...
IEC 61238-1-2 ®
Edition 1.0 2018-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Compression and mechanical connectors for power cables –
Part 1-2: Test methods and requirements for insulation piercing connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on insulated
m
conductors
Raccords sertis et à serrage mécanique pour câbles d’énergie –
Partie 1-2: Méthodes et exigences d’essai relatives aux raccords à perforation
d’isolant pour câbles d’énergie de tensions assignées inférieures ou égales
à 1 kV (U = 1,2 kV) soumis à essai sur des conducteurs isolés
m
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 61238-1-2 ®
Edition 1.0 2018-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Compression and mechanical connectors for power cables –
Part 1-2: Test methods and requirements for insulation piercing connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on insulated
m
conductors
Raccords sertis et à serrage mécanique pour câbles d’énergie –
Partie 1-2: Méthodes et exigences d’essai relatives aux raccords à perforation
d’isolant pour câbles d’énergie de tensions assignées inférieures ou égales
à 1 kV (U = 1,2 kV) soumis à essai sur des conducteurs isolés
m
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.20 ISBN 978-2-8322-6170-5
– 2 – IEC 61238-1-2:2018 © IEC 2018
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols . 10
5 General . 11
5.1 Definition of classes . 11
5.2 Cable . 11
5.3 Connectors and installation procedure . 12
5.4 Range of approval. 12
6 Electrical tests . 13
6.1 Installation . 13
6.1.1 General . 13
6.1.2 Through connectors . 13
6.1.3 Branch connectors . 14
6.2 Measurements . 14
6.2.1 General . 14
6.2.2 Electrical resistance measurements . 14
6.2.3 Temperature measurements . 15
6.3 Heat cycling test . 16
6.3.1 General . 16
6.3.2 First heat cycle . 16
6.3.3 Second heat cycle . 16
6.3.4 Subsequent heat cycles . 18
6.4 Short-circuit test for connectors according to Class A . 18
6.5 Assessment of results . 19
6.6 Requirements . 19
6.7 Examples of electrical test loop configurations and associated parameters . 20
7 Mechanical test . 24
7.1 General . 24
7.2 Method . 24
7.3 Requirements . 24
8 Test reports . 24
8.1 General . 24
8.2 Electrical tests . 24
8.3 Mechanical test . 25
Annex A (normative) Equalizers and their preparation . 26
A.1 Requirements for equalizers . 26
A.2 Recommendations for welding equalizers . 26
Annex B (normative) Measurements . 28
B.1 Potential measuring positions for typical connectors . 28
B.2 Temperature measurement . 28
B.3 Equivalent conductor resistance . 28
Annex C (informative) Recommendations to decrease uncertainties of measurement . 29
C.1 Handling the test loop . 29
C.2 Measurements, instruments and readings . 29
Annex D (normative) Calculation of adiabatic short-circuit current . 30
Annex E (informative) Determination of the value of the short-circuit current . 31
Annex F (normative) Calculation method . 32
F.1 General . 32
F.2 Measurements made . 32
F.3 Connector resistance factor k . 32
F.4 Initial scatter δ . 33
F.5 Mean scatter β . 33
F.6 Change in resistance factor of each connector . 35
F.6.1 General . 35
F.6.2 Line of best fit . 35
F.6.3 Confidence interval δ . 35
i
F.6.4 Change in resistance factor D . 36
F.7 Resistance factor ratio λ. 36
F.8 Maximum temperatures θ .
...
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