SIST EN IEC 61238-1-3:2019

Compression and mechanical connectors for power cables - Part 1-3: Test methods and requirements for compression and mechanical connectors for power cables for rated voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV) tested on non-insulated conductors (IEC 61238-1-3:2018)

This part of EN 61238 applies to compression and mechanical connectors for power cables for rated voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV), for example buried cables or cables installed in buildings, having
a) conductors complying with EN 60228 having nominal cross-sectional areas between 2,5 mm2 and 1 200 mm2 for copper and between 16 mm2 and 1 200 mm2 for aluminium, excluding Milliken conductors;
b) a maximum continuous conductor temperature not exceeding 90 °C.
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 compression and mechanical connectors for power cables with copper or aluminium conductors. The reference method is to perform the tests on unused conductors.

Pressverbinder und Schraubverbinder für Starkstromkabel - Teil 1-3: Prüfverfahren für und Anforderungen an Pressverbinder und Schraubverbinder für Starkstromkabel für Nennspannungen über 1 kV (Um = 1,2 kV) bis zu 36 kV (Um = 42 kV), geprüft an nicht isolierten Leitern (IEC 61238-1-3:2018)

Raccords sertis et à serrage mécanique pour câbles d’énergie - Partie 1-3: Méthodes et exigences d’essai relatives aux raccords sertis et à serrage mécanique pour les câbles d’énergie de tensions assignées supérieures à 1 kV (Um = 1,2 kV) jusqu’à 36 kV (Um = 42 kV) soumis à essai sur des conducteurs non isolés (IEC 61238-1-3:2018)

L’IEC 61238-1-3:2018 est applicable aux raccords sertis et à serrage mécanique pour câbles d'énergie de tensions assignées supérieures à 1 kV (U_m = 1,2 kV) jusqu’à 30 kV (U_m = 36 kV), par exemple pour les câbles enterrés ou 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 1 200 mm² pour le cuivre et entre 16 mm² et 1 200 mm² pour l’aluminium, à l’exception des âmes Milliken;
b) une température maximale de fonctionnement en service permanent au plus égale à 90 °C.
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 sertis et à serrage mécanique 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 neufs.
Cette première édition, conjointement avec l'IEC 61238-1-1 et l'IEC 61238-1-2, 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 afin de couvrir les raccords de connexion pour âmes jusqu’à 2,5 mm² (précédemment 10 mm²); il a été limité à 1 200 mm² pour les âmes en cuivre et 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 soumis à des forces mécaniques supérieures à celles spécifiées dans la Classe 1 pour les âmes de fortes sections.
c) Pour l’essai électrique, un courant de chauffage élevé maximal a été défini afin d’éviter l’apparition de densités de courant irréalistes pendant l’essai, qui peuvent modifier les propriétés des raccords en essai.
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) Une proposition d’essai électrique sur les cosses d’extrémité de câble a été introduite pour les applications de connecteurs séparables.

Stisljivi in vijačni konektorji za električne kable - 1-3. del: Preskusne metode in zahteve za stisljive in vijačne konektorje za električne kable za naznačene napetosti nad 1 kV (Um = 1,2 kV) do 36 kV (Um = 42 kV), preskušene na neizoliranih vodnikih (IEC 61238-1-3:2018)

Ta del standarda EN 61238 se uporablja za stisljive in vijačne konektorje za električne kable za naznačene napetosti nad 1 kV (Um = 1,2 kV) do 36 kV (Um = 42 kV), na primer za v zemljo položene kable ali kable, vgrajene v stavbah, ki imajo:
a) vodnike, ki so skladni s standardom EN 60228 ter imajo nominalni premer med 2,5 mm2 in 1200 mm2, če so bakreni, ter med 16 mm2 in 1200 mm2, če so aluminijasti, razen segmentnih vodnikov.
b) največjo enakomerno temperaturo vodnika, ki ne presega 90 °C.
Ta dokument se ne uporablja za konektorje vodnikov nadzemnih vodov ali za konektorje z drsnimi kontakti.
Namen tega dokumenta je opredeliti metode in zahteve tipskih preskusov, ki se uporabljajo za stisljive in vijačne konektorje za električne kable z bakrenimi ali aluminijastimi vodniki. Referenčna metoda je namenjena za izvajanje preskusov na neuporabljenih vodnikih.

General Information

• Status: Published
• Public Enquiry End Date: 31-May-2019
• Publication Date: 03-Oct-2019
• ICS: 29.060.20 - Cables
• ICS: 29.120.20 - Connecting devices
• Technical Committee: IEKA - Electric cables
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2019
• Due Date: 06-Dec-2019
• Completion Date: 04-Oct-2019
• Ref Project: EN IEC 61238-1-3:2019 - Compression and mechanical connectors for power cables - Part 1-3: Test methods and requirements for compression and mechanical connectors for power cables for rated voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV) tested on non-insulated conductors

Relations

• Replaces: SIST EN 61238-1:2004 - Compression and mechanical connectors for power cables for rated voltages up to 36 kV (Um = 42 kV) - Part 1: Test methods and requirements
• Effective Date: 05-Mar-2019
• Amended By: SIST EN IEC 61238-1-3:2019/A11:2019 - Compression and mechanical connectors for power cables - Part 1-3: Test methods and requirements for compression and mechanical connectors for power cables for rated voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV) tested on non-insulated conductors
• Effective Date: 24-Jul-2018

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61238-1-3:2019
01-december-2019
Nadomešča:
SIST EN 61238-1:2004
Stisljivi in vijačni konektorji za električne kable - 1-3. del: Preskusne metode in
zahteve za stisljive in vijačne konektorje za električne kable za naznačene
napetosti nad 1 kV (Um = 1,2 kV) do 36 kV (Um = 42 kV), preskušene na
neizoliranih vodnikih (IEC 61238-1-3:2018)
Compression and mechanical connectors for power cables - Part 1-3: Test methods and
requirements for compression and mechanical connectors for power cables for rated
voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV) tested on non-insulated
conductors (IEC 61238-1-3:2018)
Pressverbinder und Schraubverbinder für Starkstromkabel - Teil 1-3: Prüfverfahren für
und Anforderungen an Pressverbinder und Schraubverbinder für Starkstromkabel für
Nennspannungen über 1 kV (Um = 1,2 kV) bis zu 36 kV (Um = 42 kV), geprüft an nicht
isolierten Leitern (IEC 61238-1-3:2018)
Raccords sertis et à serrage mécanique pour câbles d’énergie - Partie 1-3: Méthodes et
exigences d’essai relatives aux raccords sertis et à serrage mécanique pour les câbles
d’énergie de tensions assignées supérieures à 1 kV (Um = 1,2 kV) jusqu’à 36 kV (Um =
42 kV) soumis à essai sur des conducteurs non isolés (IEC 61238-1-3:2018)
Ta slovenski standard je istoveten z: EN IEC 61238-1-3:2019
ICS:
29.060.20 Kabli Cables
29.120.20 Spojni elementi Connecting devices
SIST EN IEC 61238-1-3:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61238-1-3:2019

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SIST EN IEC 61238-1-3:2019


EUROPEAN STANDARD EN IEC 61238-1-3

NORME EUROPÉENNE

EUROPÄISCHE NORM
September 2019
ICS 29.060.20 Supersedes EN 61238-1:2003 (partially) and all of its
amendments and corrigenda (if any)
English Version
Compression and mechanical connectors for power cables -
Part 1-3: Test methods and requirements for compression and
mechanical connectors for power cables for rated voltages
above 1 kV (U = 1,2 kV) up to 36 kV (U = 42 kV) tested on
m m
non-insulated conductors
(IEC 61238-1-3:2018)
Raccords sertis et à serrage mécanique pour câbles Pressverbinder und Schraubverbinder für Starkstromkabel -
d'énergie - Partie 1-3: Méthodes et exigences d'essai Teil 1-3: Prüfverfahren für und Anforderungen an
relatives aux raccords sertis et à serrage mécanique pour Pressverbinder und Schraubverbinder für Starkstromkabel
les câbles d'énergie de tensions assignées supérieures à für Nennspannungen über 1 kV (U = 1,2 kV) bis zu 36 kV
m
1 kV (U = 1,2 kV) jusqu'à 36 kV (U = 42 kV) soumis à (U = 42 kV), geprüft an nicht isolierten Leitern
m m m
essai sur des conducteurs non isolés (IEC 61238-1-3:2018)
(IEC 61238-1-3:2018)
This European Standard was approved by CENELEC on 2019-07-19. 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,
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 61238-1-3:2019 E

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SIST EN IEC 61238-1-3:2019
EN IEC 61238-1-3:2019 (E)
European foreword
This document (EN IEC 61238-1-3:2019) consists of the text of IEC 61238-1-3:2018 prepared by
IEC/TC 20 "Electric cables".
The following dates are fixed:
• latest date by which this document has to be (dop) 2020-07-19
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2022-07-19
conflicting with this document have to be withdrawn
This document partially supersedes EN 61238-1:2003 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.
Endorsement notice
The text of the International Standard IEC 61238-1-3:2018 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 61238-1 NOTE  Harmonized as EN 61238-1.
IEC 61238-1-1 NOTE  Harmonized as EN IEC 61238-1-1.
IEC 61238-1-2 NOTE  Harmonized as EN IEC 61238-1-2.
IEC 62475:2010 NOTE  Harmonized as EN 62475:2010 (not modified).


2

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SIST EN IEC 61238-1-3:2019
EN IEC 61238-1-3:2019 (E)
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 60050-461 -  International Electrotechnical Vocabulary - - -
Part 461: Electric cables
IEC 60228 -  Conductors of insulated cables EN 60228 -
IEC 60493-1 -  Guide for the statistical analysis of ageing - -
test data - Part 1: Methods based on mean
values of normally distributed test results
IEC 60949 1988 Calculation of thermally permissible short-- -
+ A1 2008 circuit currents, taking into account non-
adiabatic heating effects



3

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SIST EN IEC 61238-1-3:2019



IEC 61238-1-3

®


Edition 1.0 2018-05




INTERNATIONAL



STANDARD



















Compression and mechanical connectors for power cables –

Part 1-3: Test methods and requirements for compression and mechanical

connectors for power cables for rated voltages above 1 kV (U = 1,2 kV) up to

m

30 kV (U = 36 kV) tested on non-insulated conductors
m
























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.060.20 ISBN 978-2-8322-5647-3



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 61238-1-3:2019
– 2 – IEC 61238-1-3:2018 © 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 Conductor . 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 and terminations . 14
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 . 15
6.3.1 General . 15
6.3.2 First heat cycle . 15
6.3.3 Second heat cycle . 16
6.3.4 Subsequent heat cycles . 17
6.4 Short-circuit test . 18
6.4.1 General . 18
2
6.4.2 Aluminium conductors with cross-sectional areas below 1 000 mm and
2
copper conductors with cross-sectional areas below 630 mm . 18
2
6.4.3 Aluminium conductors with cross-sectional areas ≥ 1 000 mm and
2
copper conductors with cross-sectional areas ≥ 630 mm . 19
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 . 26
7.1 General . 26
7.2 Method . 26
7.3 Requirements . 27
8 Test report . 27
8.1 General . 27
8.2 Electrical tests . 27
8.3 Mechanical test . 27
Annex A (normative) Equalizers and their preparation . 28
A.1 Requirements for equalizers . 28
A.2 Recommendations for welding equalizers . 28
Annex B (normative) Measurements . 30

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SIST EN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 3 –
B.1 Potential measuring positions for typical connectors . 30
B.2 Temperature measurement . 30
B.3 Equivalent conductor resistance . 30
Annex C (informative) Recommendations to decrease uncertainties of measurement . 31
C.1 Handling the test loop . 31
C.2 Measurements, instruments and readings . 31
Annex D (normative) Calculation of adiabatic short-circuit current . 32
Annex E (informative) Determination of the value of the short-circuit current . 33
Annex F (normative) Calculation method . 34
F.1 General . 34
F.2 Measurements made . 34
F.3 Connector resistance factor k . 34
F.4 Initial scatter δ . 35
F.5 Mean scatter β . 35
F.6 Change in resistance factor of each connector . 37
F.6.1 General . 37
F.6.2 Line of best fit . 37
F.6.3 Confidence interval δ . 37
i
F.6.4 Change in resistance factor D . 38
F.7 Resistance factor ratio λ. 38
F.8 Maximum temperatures θ . 38
max
Annex G (informative) Explanation on assessment of results of electrical tests on
connectors . 39
G.1 History . 39
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 . 39
G.3 The IEC 61238-1 method of assessing test results . 40
Annex H (informative) Electrical tests on cable terminal lugs for application in
separable connectors . 42
H.1 Principle . 42
H.2 Lengths . 42
H.3 Temperature measurement . 42
H.4 Median connector . 43
H.5 Electrical test parameters . 43
Bibliography . 44

Figure 1 – Example of second heat cycle profile . 17
Figure 2 – Typical electrical test loops for through connectors and terminal lugs . 22
Figure 3 – Typical electrical test loop for branch connectors . 23
Figure 4 – Typical cases of resistance measurements . 26
Figure A.1 – Preparation of equalizers . 29
Figure E.1 – Determination of equivalent RMS value of current during the short-circuit test . 33
Figure F.1 – Graphic example of assessment of a Class A individual connector . 36
Figure H.1 – Test arrangement . 43

Table 1 – Minimum period of temperature stability . 16
Table 2 – Electrical resistance measurements during the electrical test . 18

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Table 3 – Electrical test requirements . 20
Table 4 – Selection of tensile force withstand values for the mechanical test . 27
Table D.1 – Material properties . 32
Table G.1 – Summary of assessed behaviour of a tested connector . 40

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SIST EN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

COMPRESSION AND MECHANICAL
CONNECTORS FOR POWER CABLES –

Part 1-3: Test methods and requirements for compression and mechanical
connectors for power cables for rated voltages above 1 kV (U = 1,2 kV)
m
up to 30 kV (U = 36 kV) tested on non-insulated conductors
m

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 some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61238-1-3 has been prepared by IEC technical committee 20:
Electric cables.
This first edition, together with IEC 61238-1-1 and IEC 61238-1-2, cancels and replaces
IEC 61238-1:2003.
This edition includes the following significant technical changes with respect to
IEC 61238-1:2003:
2
a) The scope has been widened to cover connectors for conductors from 10 mm down to
2 2
2,5 mm and has been limited to 1 200 mm for connectors for copper and aluminium
conductors because test experience and applications are rare for conductors of larger
cross-sectional areas.

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SIST EN IEC 61238-1-3:2019
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b) A new mechanical class has been introduced to satisfy the demand for connectors
subjected to higher mechanical forces than those specified in Class 1 for conductors of
larger cross-sectional areas.
c) For the electrical test, a maximum elevated heating current has been set in order to avoid
unrealistic current densities during the test which may change the properties of tested
connectors.
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) A proposal for an electrical test on cable terminal lugs for application in separable
connectors has been introduced.
The text of this standard is based on the following documents:
FDIS Report on voting
20/1790/FDIS 20/1805/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61238 series, published under the general title Compression and
mechanical connectors for power cables, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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SIST EN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 7 –
INTRODUCTION
The IEC 61238 series has been divided into the following parts:
Part 1-1: Test methods and requirements for compression and mechanical connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on non-insulated
m
conductors
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 conductors
m
Part 1-3: Test methods and requirements for compression and mechanical connectors for
power cables for rated voltages above 1 kV (U = 1,2 kV) up to 30 kV
m
(U = 36 kV) tested on non-insulated conductors
m
This Part 1-3 of IEC 61238 deals with type tests for compression and mechanical connectors
for use on copper or aluminium conductors of power cables for rated voltages above 1 kV
(U = 1,2 kV) up to 30 kV (U = 36 kV).
m m
When a design of connector meets the requirements of this document, then it is expected that
in service:
a) the resistance of the connection will remain stable within specified limits;
b) the temperature of the connector will be of the same order or less than that of the
conductor during current heating;
c) if the intended use demands it, application of short-circuit currents will not affect a)
and b);
d) independently from the electrical performance, conforming axial tensile strength will
ensure an acceptable mechanical performance for the connections to the cable
conductors.
It should be stressed that, although the object of the electrical and mechanical tests specified
in this document is to prove the suitability of connectors for most operating conditions, they do
not necessarily apply to situations where a connector may be raised to a high temperature by
virtue of connection to a highly rated plant, to corrosive conditions, or where the connector is
subjected to external mechanical stresses such as excessive vibration, shock and large
displacement after installation. In these instances, the tests in this document may need to be
supplemented by special tests agreed between supplier and purchaser.
This document does not invalidate existing approvals of products achieved on the basis of
national standards and specifications and/or the demonstration of satisfactory service
performance. However, products approved according to such national standards or
specifications cannot directly claim approval to this document.
Once successfully completed, these tests are not repeated unless changes are made in
material, manufacturing process and design which might adversely change the connector
performance characteristics.

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COMPRESSION AND MECHANICAL
CONNECTORS FOR POWER CABLES –

Part 1-3: Test methods and requirements for compression and mechanical
connectors for power cables for rated voltages above 1 kV (U = 1,2 kV)
m
up to 30 kV (U = 36 kV) tested on non-insulated conductors
m



1 Scope
This part of IEC 61238 applies to compression and mechanical connectors for power cables
for rated voltages above 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV), for example buried
m m
cables or cables installed in buildings, having
a) conductors complying with IEC 60228 having nominal cross-sectional areas between
2 2 2 2
2,5 mm and 1 200 mm for copper and between 16 mm and 1 200 mm for aluminium,
excluding Milliken conductors;
b) a maximum continuous conductor temperature not exceeding 90 °C.
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 compression and mechanical connectors for power cables with copper or aluminium
conductors. The reference method is to perform the tests on unused conductors.
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
...

SLOVENSKI STANDARD
oSIST prEN IEC 61238-1-3:2019
1DGRPHãþD
SIST EN 61238-1:2004
6WLVOMLYLLQYLMDþQLNRQHNWRUML]DHOHNWURHQHUJHWVNHNDEOHGHO3UHVNXVQH
PHWRGHLQ]DKWHYH]DNRPSUHVLMVNHLQPHKDQVNHNRQHNWRUMH]DHOHNWURHQHUJHWVNH
NDEOH]QD]QDþHQLPLQDSHWRVWPLGRN98P N9GRN98P N9
SUHVNXãHQHQDQHL]ROLUDQLKYRGQLNLK,(&
Compression and mechanical connectors for power cables - Part 1-3: Test methods and
requirements for compression and mechanical connectors for power cables for rated
voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um = 42 kV) tested on non-insulated
conductors (IEC 61238-1-3:2018)
Pressverbinder und Schraubverbinder für Starkstromkabel - Teil 1-3: Prüfverfahren für
und Anforderungen an Pressverbinder und Schraubverbinder für Starkstromkabel für
Nennspannungen über 1 kV (Um = 1,2 kV) bis zu 36 kV (Um = 42 kV), geprüft an nicht
isolierten Leitern (IEC 61238-1-3:2018)
Raccords sertis et à serrage mécanique pour câbles d’énergie - Partie 1-3: Méthodes et
exigences d’essai relatives aux raccords sertis et à serrage mécanique pour les câbles
d’énergie de tensions assignées supérieures à 1 kV (Um = 1,2 kV) jusqu’à 36 kV (Um =
42 kV) soumis à essai sur des conducteurs non isolés (IEC 61238-1-3:2018)
Ta slovenski standard je istoveten z: prEN IEC 61238-1-3:2019
ICS:
29.060.20 Kabli Cables
29.120.20 Spojni elementi Connecting devices
oSIST prEN IEC 61238-1-3:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61238-1-3:2019

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oSIST prEN IEC 61238-1-3:2019


EUROPEAN STANDARD DRAFT
prEN IEC 61238-1-3
NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2019
ICS  Will supersede EN 61238-1:2003 (partially)
English Version
Compression and mechanical connectors for power cables - Part 1-3: Test

methods and requirements for compression and mechanical connectors for
power cables for rated voltages above 1 kV (Um = 1,2 kV) up to 36 kV (Um
= 42 kV) tested on non-insulated conductors
(IEC 61238-1-3:2018)
Raccords sertis et à serrage mécanique pour câbles Pressverbinder und Schraubverbinder für Starkstromkabel
d'énergie - Partie 1-3: Méthodes et exigences d'essai - Teil 1-3: Prüfverfahren für und Anforderungen an
relatives aux raccords sertis et à serrage mécanique pour Pressverbinder und Schraubverbinder für Starkstromkabel
les câbles d'énergie de tensions assignées supérieures à 1 für Nennspannungen über 1 kV (Um = 1,2 kV) bis zu 36 kV
kV (Um = 1,2 kV) jusqu'à 36 kV (Um = 42 kV) soumis à (Um = 42 kV), geprüft an nicht isolierten Leitern
essai sur des conducteurs non isolés (IEC 61238-1-3:2018)
(IEC 61238-1-3:2018)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-06-07.

The text of this draft consists of the text of IEC 61238-1-3:2018 (20/1790/FDIS).

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.



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.
Project: 67148 Ref. No. prEN IEC 61238-1-3:2019 E

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oSIST prEN IEC 61238-1-3:2019
prEN IEC 61238-1-3:2019 (E)
European foreword
This document (prEN IEC 61238-1-3:2019) consists of the text of IEC 61238-1-3:2018 prepared by
IEC/TC 20 "Electric cables".
This document is currently submitted to the Enquiry.
Note (to be deleted at publication): this document is subject to common modifications – it has to be
read in conjunction with the relevant amendment (currently also under enquiry).
The following dates are proposed:
• latest date by which the existence of this document (doa) dor + 6 months
has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be withdrawn (to be confirmed or
modified when voting)
2

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oSIST prEN IEC 61238-1-3:2019
prEN IEC 61238-1-3:2019 (E)
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 60050-461 -  International Electrotechnical Vocabulary - - -
Part 461: Electric cables
IEC 60228 -  Conductors of insulated cables EN 60228 -
IEC 60493-1 -  Guide for the statistical analysis of ageing - -
test data - Part 1: Methods based on mean
values of normally distributed test results
IEC 60949 1988 Calculation of thermally permissible short-- -
+ A1 2008 circuit currents, taking into account non-
adiabatic heating effects



3

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oSIST prEN IEC 61238-1-3:2019



IEC 61238-1-3

®


Edition 1.0 2018-05




INTERNATIONAL



STANDARD



















Compression and mechanical connectors for power cables –

Part 1-3: Test methods and requirements for compression and mechanical

connectors for power cables for rated voltages above 1 kV (U = 1,2 kV) up to

m

30 kV (U = 36 kV) tested on non-insulated conductors
m
























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.060.20 ISBN 978-2-8322-5647-3



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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oSIST prEN IEC 61238-1-3:2019
– 2 – IEC 61238-1-3:2018 © 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 Conductor . 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 and terminations . 14
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 . 15
6.3.1 General . 15
6.3.2 First heat cycle . 15
6.3.3 Second heat cycle . 16
6.3.4 Subsequent heat cycles . 17
6.4 Short-circuit test . 18
6.4.1 General . 18
2
6.4.2 Aluminium conductors with cross-sectional areas below 1 000 mm and
2
copper conductors with cross-sectional areas below 630 mm . 18
2
6.4.3 Aluminium conductors with cross-sectional areas ≥ 1 000 mm and
2
copper conductors with cross-sectional areas ≥ 630 mm . 19
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 . 26
7.1 General . 26
7.2 Method . 26
7.3 Requirements . 27
8 Test report . 27
8.1 General . 27
8.2 Electrical tests . 27
8.3 Mechanical test . 27
Annex A (normative) Equalizers and their preparation . 28
A.1 Requirements for equalizers . 28
A.2 Recommendations for welding equalizers . 28
Annex B (normative) Measurements . 30

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oSIST prEN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 3 –
B.1 Potential measuring positions for typical connectors . 30
B.2 Temperature measurement . 30
B.3 Equivalent conductor resistance . 30
Annex C (informative) Recommendations to decrease uncertainties of measurement . 31
C.1 Handling the test loop . 31
C.2 Measurements, instruments and readings . 31
Annex D (normative) Calculation of adiabatic short-circuit current . 32
Annex E (informative) Determination of the value of the short-circuit current . 33
Annex F (normative) Calculation method . 34
F.1 General . 34
F.2 Measurements made . 34
F.3 Connector resistance factor k . 34
F.4 Initial scatter δ . 35
F.5 Mean scatter β . 35
F.6 Change in resistance factor of each connector . 37
F.6.1 General . 37
F.6.2 Line of best fit . 37
F.6.3 Confidence interval δ . 37
i
F.6.4 Change in resistance factor D . 38
F.7 Resistance factor ratio λ. 38
F.8 Maximum temperatures θ . 38
max
Annex G (informative) Explanation on assessment of results of electrical tests on
connectors . 39
G.1 History . 39
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 . 39
G.3 The IEC 61238-1 method of assessing test results . 40
Annex H (informative) Electrical tests on cable terminal lugs for application in
separable connectors . 42
H.1 Principle . 42
H.2 Lengths . 42
H.3 Temperature measurement . 42
H.4 Median connector . 43
H.5 Electrical test parameters . 43
Bibliography . 44

Figure 1 – Example of second heat cycle profile . 17
Figure 2 – Typical electrical test loops for through connectors and terminal lugs . 22
Figure 3 – Typical electrical test loop for branch connectors . 23
Figure 4 – Typical cases of resistance measurements . 26
Figure A.1 – Preparation of equalizers . 29
Figure E.1 – Determination of equivalent RMS value of current during the short-circuit test . 33
Figure F.1 – Graphic example of assessment of a Class A individual connector . 36
Figure H.1 – Test arrangement . 43

Table 1 – Minimum period of temperature stability . 16
Table 2 – Electrical resistance measurements during the electrical test . 18

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Table 3 – Electrical test requirements . 20
Table 4 – Selection of tensile force withstand values for the mechanical test . 27
Table D.1 – Material properties . 32
Table G.1 – Summary of assessed behaviour of a tested connector . 40

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oSIST prEN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

COMPRESSION AND MECHANICAL
CONNECTORS FOR POWER CABLES –

Part 1-3: Test methods and requirements for compression and mechanical
connectors for power cables for rated voltages above 1 kV (U = 1,2 kV)
m
up to 30 kV (U = 36 kV) tested on non-insulated conductors
m

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 some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61238-1-3 has been prepared by IEC technical committee 20:
Electric cables.
This first edition, together with IEC 61238-1-1 and IEC 61238-1-2, cancels and replaces
IEC 61238-1:2003.
This edition includes the following significant technical changes with respect to
IEC 61238-1:2003:
2
a) The scope has been widened to cover connectors for conductors from 10 mm down to
2 2
2,5 mm and has been limited to 1 200 mm for connectors for copper and aluminium
conductors because test experience and applications are rare for conductors of larger
cross-sectional areas.

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oSIST prEN IEC 61238-1-3:2019
– 6 – IEC 61238-1-3:2018 © IEC 2018
b) A new mechanical class has been introduced to satisfy the demand for connectors
subjected to higher mechanical forces than those specified in Class 1 for conductors of
larger cross-sectional areas.
c) For the electrical test, a maximum elevated heating current has been set in order to avoid
unrealistic current densities during the test which may change the properties of tested
connectors.
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) A proposal for an electrical test on cable terminal lugs for application in separable
connectors has been introduced.
The text of this standard is based on the following documents:
FDIS Report on voting
20/1790/FDIS 20/1805/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61238 series, published under the general title Compression and
mechanical connectors for power cables, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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oSIST prEN IEC 61238-1-3:2019
IEC 61238-1-3:2018 © IEC 2018 – 7 –
INTRODUCTION
The IEC 61238 series has been divided into the following parts:
Part 1-1: Test methods and requirements for compression and mechanical connectors for
power cables for rated voltages up to 1 kV (U = 1,2 kV) tested on non-insulated
m
conductors
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 conductors
m
Part 1-3: Test methods and requirements for compression and mechanical connectors for
power cables for rated voltages above 1 kV (U = 1,2 kV) up to 30 kV
m
(U = 36 kV) tested on non-insulated conductors
m
This Part 1-3 of IEC 61238 deals with type tests for compression and mechanical connectors
for use on copper or aluminium conductors of power cables for rated voltages above 1 kV
(U = 1,2 kV) up to 30 kV (U = 36 kV).
m m
When a design of connector meets the requirements of this document, then it is expected that
in service:
a) the resistance of the connection will remain stable within specified limits;
b) the temperature of the connector will be of the same order or less than that of the
conductor during current heating;
c) if the intended use demands it, application of short-circuit currents will not affect a)
and b);
d) independently from the electrical performance, conforming axial tensile strength will
ensure an acceptable mechanical performance for the connections to the cable
conductors.
It should be stressed that, although the object of the electrical and mechanical tests specified
in this document is to prove the suitability of connectors for most operating conditions, they do
not necessarily apply to situations where a connector may be raised to a high temperature by
virtue of connection to a highly rated plant, to corrosive conditions, or where the connector is
subjected to external mechanical stresses such as excessive vibration, shock and large
displacement after installation. In these instances, the tests in this document may need to be
supplemented by special tests agreed between supplier and purchaser.
This document does not invalidate existing approvals of products achieved on the basis of
national standards and specifications and/or the demonstration of satisfactory service
performance. However, products approved according to such national standards or
specifications cannot directly claim approval to this document.
Once successfully completed, these tests are not repeated unless changes are made in
material, manufacturing process and design which might adversely change the connector
performance characteristics.

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oSIST prEN IEC 61238-1-3:2019
– 8 – IEC 61238-1-3:2018 © IEC 2018
COMPRESSION AND MECHANICAL
CONNECTORS FOR POWER CABLES –

Part 1-3: Test methods and requirements for compression and mechanical
connectors for power cables for rated voltages above 1 kV (U = 1,2 kV)
m
up to 30 kV (U = 36 kV) tested on non-insulated conductors
m



1 Scope
This part of IEC 61238 applies to compression and mechanical connectors for power cables
for rated voltages above 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV), for example buried
m m
cables or cables installed in buildings, having
a) conductors complying with IEC 60228 having nominal cross-sectional areas between
2 2 2 2
2,5 mm and 1 200 mm for copper and between 16 mm and 1 200 mm for aluminium,
excluding Milliken conductors;
b) a maximum continuous conductor temperature not exceeding 90 °C.
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 compression and mechanical connectors for power cables with copper or aluminium
conductors. The reference method is to perform the tests on unused conductors.
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 (includi
...