Installation couplers intended for permanent connection in fixed installations (IEC 61535:2019)

This document applies to two-wire, up to five-wire installation couplers, including earth, if
provided, with a rated voltage up to and including 500 V AC or DC and a rated connecting
capacity up to and including 10 mm2 for permanent connection in electrical installations.
Installation couplers with additional contacts for voltages other than mains voltages are
outside the scope of this document.
An installation coupler consists of an installation female connector and an installation male
connector for permanent connection not intended to be engaged or disengaged under load
nor to be engaged or disengaged other than during first installation or during reconfiguration
or maintenance of the wiring system in which installation couplers have been installed. This
means that installation couplers are only intended for infrequent use.
Installation couplers are not suitable for use in place of socket-outlet systems. Installation
couplers are not suitable for use in place of devices for connecting luminaires (DCLs)
according to IEC 61995 (all parts) or in place of luminaire supporting couplers (LSCs).
Installation couplers complying with this document are suitable for use at ambient
temperatures not normally exceeding +40 °C, but their average over a period does not exceed
+35 °C, with a lower limit of the ambient air temperature of −5 °C, either for indoor or outdoor
use.
NOTE 1 Additional tests for use in cold climates are under consideration.
NOTE 2 For other temperatures, necessary information can be given in the manufacturer's installation
instructions.
In locations where special conditions prevail, as in ships, vehicles and the like and in
hazardous locations, for example where explosions are liable to occur, special constructions
can be required.
NOTE 3 Installation couplers are intended to be installed by instructed or skilled persons.

Installationssteckverbinder für dauernde Verbindung in festen Installationen (IEC 61535:2019)

Coupleurs d'installation pour connexions permanentes dans les installations fixes (IEC 61535:2019)

IEC 61535:2019 est disponible sous forme de IEC 61535:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

IEC 61535:2019 s'applique aux coupleurs d'installation comportant de deux à cinq conducteurs, y compris le conducteur de terre (le cas échéant), de tension assignée jusqu'à 500 V inclus en courant alternatif ou en courant continu et de capacité de connexion assignée jusqu'à 10 mm2 inclus, pour connexion permanente dans les installations électriques. Les coupleurs d'installation avec des contacts supplémentaires pour des tensions autres que la tension d'alimentation du réseau ne relèvent pas du domaine d'application du présent document. Cette deuxième édition annule et remplace la première édition parue en 2009 et l'Amendement 1:2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- extension du domaine d'application à l'application en courant continu;
- ajout des exigences supplémentaires en matière d'application en courant continu (marquage, etc.), aucune procédure d'essai supplémentaire n'a été jugée nécessaire; toutefois, certaines modifications du texte normatif étaient nécessaires;
- modifications et amélioration du champ d'application des coupleurs d'installation aux applications extérieures;
- ajout d'une plage de températures appropriée;
- mise à jour de la liste des références normatives, modifiée pour inclure des références non datées, lorsque cela était possible.

Inštalacijske spojke za trajni spoj v fiksnih napeljavah (inštalacijah) (IEC 61535:2019)

General Information

Status
Published
Public Enquiry End Date
29-Nov-2018
Publication Date
26-Feb-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-Dec-2019
Due Date
28-Feb-2020
Completion Date
27-Feb-2020

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61535:2020
01-april-2020
Nadomešča:
SIST EN 61535:2009
SIST EN 61535:2009/A1:2013
Inštalacijske spojke za trajni spoj v fiksnih napeljavah (inštalacijah) (IEC
61535:2019)
Installation couplers intended for permanent connection in fixed installations (IEC
61535:2019)
Installationssteckverbinder für dauernde Verbindung in festen Installationen (IEC
61535:2019)
Coupleurs d'installation pour connexions permanentes dans les installations fixes (IEC
61535:2019)
Ta slovenski standard je istoveten z: EN IEC 61535:2019
ICS:
29.120.30 Vtiči, vtičnice, spojke Plugs, socket-outlets,
couplers
SIST EN IEC 61535:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61535:2020

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SIST EN IEC 61535:2020


EUROPEAN STANDARD EN IEC 61535

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2019
ICS 29.100.99 Supersedes EN 61535:2009 and all of its amendments
and corrigenda (if any)
English Version
Installation couplers intended for permanent connection in fixed
installations
(IEC 61535:2019)
Coupleurs d'installation pour connexions permanentes dans Installationssteckverbinder für dauernde Verbindung in
les installations fixes festen Installationen
(IEC 61535:2019) (IEC 61535:2019)
This European Standard was approved by CENELEC on 2019-11-20. 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,
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 61535:2019 E

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SIST EN IEC 61535:2020
EN IEC 61535:2019 (E)
European foreword
The text of document 23/792/CDV, future edition of IEC 61535:2019, prepared by IEC/TC 23
"Electrical accessories" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 61535:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-08-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-11-20
document have to be withdrawn

This document supersedes EN 61535:2009 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 has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 61535:2019 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 60309 (series) NOTE Harmonized as EN 60309-4:2007/A1 (series)
IEC 60320 (series) NOTE Harmonized as EN 60320 (series)
IEC 60364 (series) NOTE Harmonized as HD 60364 (series)
IEC 60364-4-41:2005 NOTE Harmonized as HD 60364-4-41:2017
IEC 60364-5-52:2009 NOTE Harmonized as HD 60364-5-52:2011
IEC 61995 (series) NOTE Harmonized as EN 61995-2:2009/A1 (series)


2

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SIST EN IEC 61535:2020
EN IEC 61535:2019 (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 60068-2-31 2008 Environmental testing - Part 2-31: Tests - EN 60068-2-31 2008
Test Ec: Rough handling shocks, primarily
for equipment-type specimens
IEC 60112 - Method for the determination of the proof EN 60112 2003
and the comparative tracking indices of
solid insulating materials
  + A1 2009
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
+ A1 1999  + A1 2000
+ A2 2013  + A2 2013
IEC 60664-1 2007 Insulation coordination for equipment EN 60664-1 2007
within low-voltage systems - Part 1:
Principles, requirements and tests
IEC 60695-2-11 -  Fire hazard testing - Part 2-11: EN 60695-2-11 -
Glowing/hot-wire based test methods -
Glow-wire flammability test method for
end-products (GWEPT)
IEC 60998-2-3 -  Connecting devices for low-voltage circuits EN 60998-2-3 -
for household and similar purposes - Part
2-3: Particular requirements for connecting
devices as separate entities with
insulation-piercing clamping units
IEC 60999-1 1999 Connecting devices - Electrical copper EN 60999-1 2000
conductors - Safety requirements for
screw-type and screwless-type clamping
units - Part 1: General requirements and
particular requirements for clamping units
for conductors from 0,2 mm2 up to 35 mm2
(included)
IEC 61032 1997 Protection of persons and equipment by EN 61032 1998
enclosures - Probes for verification
3

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SIST EN IEC 61535:2020
EN IEC 61535:2019 (E)
Annex ZZ
(informative)

Relationship between this European standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered

This European standard has been prepared under a Commission’s standardisation
request relating to harmonised standards in the field of the Low Voltage Directive,
M/511, to provide one voluntary means of conforming to safety objectives of Directive
2014/35/EU of the European Parliament and of the Council of 26 February 2014 on
the harmonisation of the laws of the Member States relating to the making available
on the market of electrical equipment designed for use within certain voltage limits
[2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that
Directive, compliance with the normative clauses of this standard given in Table ZZ.1
confers, within the limits of the scope of this standard, a presumption of conformity
with the corresponding safety objectives of that Directive, and associated EFTA
regulations.

Table ZZ.1 — Correspondence between this European standard and Annex I of
Directive 2014/35/EU [2014 OJ L96]

Safety objectives of Clause(s) / sub-clause(s)
Remarks / Notes
Directive 2014/35/EU of this EN
(1)(a)
Clauses 1, 7, 8, Annex D, Annex
E

(1)(b)
Clauses 6.2, 6.3, 8.3, 8.4, 9, 11,
12, 19, 22, Annex A, Annex E

(1)(c)
Clause 4
(2)(a) Clauses 9, 10, 12, 14, 16, 19.5,
20, 21, 23, Annex A
(2)(b) Clauses 11.2, 12.9, 15, 16, 17,
21.5
(2)(c) Clauses 10.1, 12, 24
(2)(d)
Clauses 6, 10, 14, 21, 23, 24
(3)(a)
Clauses 9.1, 12, 13, 18, 19.2,
19.3, 19.4, 20, 21.3, 21.4, 22
(3)(b) Clauses 13, 21, 24, 25
(3)(c) Clauses 11.2, 12.2, 12.3

WARNING 1: Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.

WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
4

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SIST EN IEC 61535:2020



IEC 61535

®


Edition 2.0 2019-10




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Installation couplers intended for permanent connection in fixed installations



Coupleurs d'installation pour connexions permanentes dans les installations


fixes

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.120.99 ISBN 978-2-8322-7428-6




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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------
SIST EN IEC 61535:2020
– 2 – IEC 61535:2019 © IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General requirements . 12
5 Conditions for tests . 12
5.1 General . 12
5.2 Test conditions . 13
5.3 Tests on non-rewirable installation couplers . 13
5.4 Order of tests . 13
5.5 Specification of tests . 13
5.6 Compliance requirements . 13
5.7 Routine tests for non-rewirable installation couplers . 13
6 Ratings . 13
6.1 Rated voltage . 13
6.2 Rated current . 14
6.3 Rated connecting capacity . 14
6.4 Tests . 15
7 Classification . 15
8 Marking and documentation . 15
8.1 General . 15
8.2 Use of symbols or letters . 16
8.3 Markings . 16
8.4 Documentation . 17
9 Dangerous compatibility . 17
9.1 Unintended or improper connection . 17
9.2 Engagement . 18
9.3 Compatibility of different installation coupler systems . 18
9.4 Compatibility with standard systems . 18
10 Protection against electric shock . 18
10.1 Degree of protection against ingress of solid foreign objects . 18
10.2 Access to live parts . 19
10.3 External parts . 19
11 Terminals, terminations and connectable conductors . 19
11.1 Terminals and terminations . 19
11.1.1 General . 19
11.1.2 Terminals of rewirable installation couplers . 19
11.1.3 Terminations of non-rewirable installation couplers . 20
11.2 Connectable conductors. 20
12 Construction . 20
12.1 Earth connection . 20
12.2 Locking against rotation . 21
12.3 Mechanical strength of contacts . 21
12.4 Housing of rewirable installation couplers . 21

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SIST EN IEC 61535:2020
IEC 61535:2019 © IEC 2019 – 3 –
12.5 Housing of non-rewirable installation couplers . 21
12.6 Dismantling and opening of rewirable installation couplers . 21
12.7 Earthing contact and earthing terminal . 22
12.8 Loose conductor strands . 22
12.8.1 General . 22
12.8.2 Strand test for rewirable installation couplers . 22
12.8.3 Strand test for non-rewirable installation couplers . 23
12.8.4 Strand test for non-rewirable moulded-on installation couplers . 23
12.9 Incorporation of electrical devices . 23
12.10 Retaining means . 23
12.11 Distribution blocks . 24
12.12 Shrouds . 24
12.13 Factory wiring . 24
12.14 Stress test . 24
12.14.1 General . 24
12.14.2 Stress test of rewirable installation couplers . 24
12.14.3 Stress test of non-rewirable installation couplers . 24
12.15 Separation of non-rewirable installation couplers . 25
13 Protection against harmful ingress of solid foreign objects and against harmful
ingress of water . 25
13.1 General . 25
13.2 Protection against harmful ingress of solid foreign objects . 25
13.3 Protection against harmful ingress of water . 25
14 Insulation resistance and electric strength . 25
14.1 General . 25
14.2 Insulation resistance . 26
14.3 Electric strength . 26
15 Construction of contacts . 27
15.1 Resiliency . 27
15.2 Resistance of connections . 27
15.3 Contact pressure . 27
16 Temperature rise . 27
17 Breaking capacity . 28
18 Forces necessary to disengage the parts of the installation coupler . 29
19 Cables and their connection . 29
19.1 Capability of being fitted . 29
19.2 Relief from pull, thrust and torsion . 30
19.3 Relief . 30
19.4 Capability to connect cables with different cross-sectional area . 30
19.5 Sharp edges . 33
20 Mechanical strength . 33
21 Resistance to heat and ageing. 34
21.1 Resistance to heat . 34
21.2 Dry heat storage . 34
21.3 Ball pressure test . 34
21.4 Ageing of elastomeric and thermoplastic material . 35
21.5 Current cycling test . 35
22 Screws, current-carrying parts and connections . 36

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SIST EN IEC 61535:2020
– 4 – IEC 61535:2019 © IEC 2019
22.1 Screws and nuts . 36
22.2 Screws and insulating material . 37
22.3 Screws and rivets for electrical and mechanical connections. 38
22.4 Metals of current-carrying parts . 38
23 Clearances, creepage distances and distances through solid insulation . 38
24 Resistance to abnormal heat and to tracking . 41
24.1 Resistance to abnormal heat . 41
24.2 Resistance to tracking . 43
25 Resistance to rusting . 43
Annex A (normative)  Routine earth (PE) continuity tests . 45
Annex B (normative) Test circuits for temperature rise test . 46
Annex C (normative)  Number of sets of test samples used for the tests and sequence
of tests for each set . 49
Annex D (informative) Guide to use . 50
D.1 General . 50
D.2 Applications . 50
D.3 Use of installation couplers . 50
Annex E (normative) Warning symbol used in DC applications . 52
Bibliography . 53

Figure 1 – Apparatus for testing the cable anchorage . 32
Figure 2 – Apparatus for measuring the distortion (example) . 33
Figure 3 – Ball-pressure apparatus . 35
Figure 4 – Explanation of "small part" . 43
Figure B.1 – 1P + N + PE installation couplers, including N (left figure), including PE

(right figure) . 46
Figure B.2 – 3P + N + PE installation couplers, 3 phases loaded (left figure), N and PE
loaded (right figure) . 46
Figure B.3 – 1P + N + PE distribution block, phase and N loaded . 47
Figure B.4 – 1P + N + PE distribution block, phase and PE loaded . 47
Figure B.5 – 3P + N + PE to 1P + N + PE distribution block, 3 phases loaded . 48
Figure B.6 – 3P + N + PE to 1P + N + PE distribution block, N and PE loaded . 48
Figure D.1 – Examples of use of installation couplers . 51
Figure E.1 – Symbol "DO NOT CONNECT OR DISCONNECT UNDER LOAD" . 52

Table 1 – Voltage rating for installation couplers in AC application . 14
Table 2 – Voltage rating for installation couplers in DC application . 14
Table 3 – Classes of installation couplers . 15
Table 4 – Test currents for installation couplers . 28
Table 5 – Forces to be applied to cable anchorages . 31
Table 6 – Torque applied for the tightening and loosening test . 37
Table 7 – Installation couplers intended for use in supply systems with a maximum
voltage to earth of 150 V AC, rated impulse voltage 2,5 kV . 38
Table 8 – Installation couplers intended for use in supply systems with a maximum
voltage to earth of 300 V AC, rated impulse voltage 4,0 kV . 39

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SIST EN IEC 61535:2020
IEC 61535:2019 © IEC 2019 – 5 –
Table 9 – Installation couplers intended for use in single-phase two-wire systems
50 V DC and single-phase three-wire systems 60 V DC, rated impulse voltage 0,8 kV . 39
Table 10 – Installation couplers intended for use in single-phase two-wire systems
120 V DC and single-phase three-wire systems 240 V DC, rated impulse voltage
2,5 kV . 40
Table 11 – Installation couplers intended for use in single-phase two-wire systems
220 V DC and single-phase three-wire systems 440 V DC, rated impulse voltage

4,0 kV . 41
Table C.1 – Sets of samples . 49

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SIST EN IEC 61535:2020
– 6 – IEC 61535:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INSTALLATION COUPLERS INTENDED FOR PERMANENT
CONNECTION IN FIXED INSTALLATIONS

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
transpa
...

SLOVENSKI STANDARD
oSIST prEN IEC 61535:2018
01-november-2018
Inštalacijske spojke za trajni spoj v fiksnih napeljavah (inštalacijah)
Installation couplers intended for permanent connection in fixed installations
Installationssteckverbinder für dauernde Verbindung in festen Installationen
Coupleurs d'installation pour connexions permanentes dans les installations fixes
Ta slovenski standard je istoveten z: prEN IEC 61535:2018
ICS:
29.120.30 9WLþLYWLþQLFHVSRMNH Plugs, socket-outlets,
couplers
oSIST prEN IEC 61535:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61535:2018

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oSIST prEN IEC 61535:2018
23/792/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61535 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2018-09-07 2018-11-30
SUPERSEDES DOCUMENTS:
23/777/CD,23/781A/CC

IEC TC 23 : ELECTRICAL ACCESSORIES
SECRETARIAT: SECRETARY:
Belgium Mr Wim De Kesel
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:


Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:

EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.

TITLE:
Installation couplers intended for permanent connection in fixed installations

PROPOSED STABILITY DATE: 2021

NOTE FROM TC/SC OFFICERS:
This draft has been prepared by TC23/ MT6 based on the resolved comments received on CD
circulated as 23/777/CD. The resolved comments, based on findings in the MT6 meeting in Dusseldorf
were circulated with 23/781A/CC.

Copyright © 2018 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for
any other purpose without permission in writing from IEC.

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oSIST prEN IEC 61535:2018
61535/Ed.2/CDV © IEC(E) 2 23/792/CDV

1 CONTENTS
2
3 FOREWORD . 5
4 INTRODUCTION . 7
5 1 Scope . 8
6 2 Normative references . 8
7 3 Terms and definitions . 9
8 4 General requirements . 11
9 5 Conditions for tests. 11
10 5.1 General . 11
11 5.2 Test conditions . 11
12 5.3 Tests on non-rewireable installation couplers . 11
13 5.4 Order of tests . 12
14 5.5 Specification of tests . 12
15 5.6 Compliance requirements . 12
16 5.7 Routine tests for non-rewirable installation couplers . 12
17 6 Ratings . 12
18 6.1 Rated voltage . 12
19 6.2 Rated current . 13
20 6.3 Rated connecting capacity . 13
21 6.4 Tests . 13
22 7 Classification . 13
23 7.1 General . 13
24 8 Marking and documentation . 14
25 8.1 General . 14
26 8.2 Use of symbols or letters . 15
27 8.3 Markings . 15
28 8.4 Documentation . 15
29 9 Dangerous compatibility . 16
30 9.1 Unintended or improper connection . 16
31 9.2 Engagement . 16
32 9.3 Compatibility of different installation coupler systems . 16
33 9.4 Compatibility with standard systems . 17
34 10 Protection against electric shock . 17
35 10.1 Degree of protection against ingress of foreign solid objects . 17
36 10.2 Access to live parts . 17
37 10.3 External parts . 17
38 11 Terminals, terminations and connectable conductors . 17
39 11.1 Terminals and terminations . 17
40 11.1.1 Terminals of rewirable installation couplers . 17
41 11.1.2 Terminations of non-rewirable installation couplers . 18
42 11.2 Connectable conductors . 18
43 12 Construction . 18
44 12.1 Earth connection . 18
45 12.2 Locking against rotation . 18
46 12.3 Mechanical strength of contacts . 19
47 12.4 Housing of rewirable installation couplers . 19
48 12.5 Housing of non-rewirable installation couplers . 19

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oSIST prEN IEC 61535:2018
61535/Ed.2/CDV © IEC(E) 3 23/792/CDV

49 12.6 Dismantling and opening of rewirable installation couplers . 19
50 12.7 Earthing contact and earthing terminal . 19
51 12.8 Loose conductor strands . 19
52 12.8.1 Strand test for rewirable installation couplers. 20
53 12.8.2 Strand test for non-rewirable installation couplers . 20
54 12.8.3 Strand test for non-rewirable moulded-on installation couplers . 20
55 12.9 Incorporation of electrical devices . 21
56 12.10 Retaining means . 21
57 12.11 Distribution blocks . 21
58 12.12 Shrouds . 21
59 12.13 Factory wiring . 21
60 12.14 Stress test . 21
61 12.14.1 Stress test of rewirable installation couplers . 21
62 12.14.2 Stress test of non-rewirable installation couplers . 22
63 12.15 Separation of non-rewirable installation couplers . 22
64 13 Protection against harmful ingress of solid foreign objects and against harmful
65 ingress of water . 22
66 13.1 Protection against harmful ingress of foreign solid objects . 22
67 13.2 Protection against harmful ingress of water . 22
68 14 Insulation resistance and electric strength . 22
69 14.1 Insulation Resistance . 23
70 14.2 Electrical strength . 23
71 15 Construction of contacts . 24
72 15.1 Resiliency . 24
73 15.2 Resistance of connections . 24
74 15.3 Contact pressure . 24
75 16 Temperature rise . 24
76 17 Breaking capacity . 25
77 18 Forces necessary to disengage the parts of the installation coupler . 25
78 19 Cables and their connection . 26
79 19.1 Capability of being fitted . 26
80 19.2 Relieve from pull, thrust and torsion . 26
81 19.3 Relief . 26
82 19.4 Capability to connect cables with different cross sectional area . 26
83 19.5 Sharp edges . 29
84 20 Mechanical strength . 29
85 21 Resistance to heat and ageing . 30
86 21.1 Resistance to heat . 30
87 21.2 Dry heat storage . 30
88 21.3 Ball-pressure test on parts . 30
89 21.4 Ageing of elastomeric and thermoplastic material . 31
90 21.5 Current cycling test . 31
91 22 Screws, current-carrying parts and connections . 32
92 22.1 Screws and nuts . 32
93 22.2 Screws and insulating material . 33
94 22.3 Screws and rivets for electrical and mechanical connections . 33
95 22.4 Metals of current-carrying parts . 33
96 23 Clearances, creepage distances and distances through solid insulation . 34
97 24 Resistance to abnormal heat and to tracking . 38

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98 24.1 Resistance to abnormal heat . 38
99 24.2 Resistance to tracking. 40
100 25 Resistance to rusting . 40
101 Annex A (normative)  Routine Earth (PE) continuity tests . 42
102 Annex B (normative) Test circuits for temperature rise test (see Clause 16). 43
103 Annex C (normative)  Number of sets of test samples used for the tests and sequence
104 of tests for each set . 48
105 Annex D (informative) Guide to use . 49
106 D.1 General . 49
107 D.2 Applications . 49
108 D.3 Use of installation couplers . 49
109 Annex E (normative) Warning symbol used in DC-applications . 51
110 E.1 General . 51
111 Bibliography . 52
112
113 Figure 1 – Apparatus for testing the cable anchorage . 28
114 Figure 2 – Apparatus for the measuring of the distortion (example) . 29
115 Figure 3 – Ball-pressure apparatus . 31
116 Figure 4 – Explanation of “small part” . 40
117 Figure B.1 – 1P + N + PE installation couplers, including N (left figure), including PE
118 (right figure) . 43
119 Figure B.2 – 3P + N + PE installation couplers, 3 phases loaded (left figure), N and PE
120 loaded (right figure) . 43
121 Figure B.3 – 1P + N + PE distribution block, phase and N loaded . 44
122 Figure B.4 – 1P + N + PE distribution block, phase and PE loaded . 45
123 Figure B.5 – 3P + N + PE - to 1P + N + PE distribution block, 3 phases loaded . 46
124 Figure B.6 – 3P + N + PE - to 1P + N + PE distribution block, N and PE loaded . 47
125 Figure D.1 – Examples of use of installation couplers . 50
126 Figure E.1 – Symbol “DO NOT (CONNECT OR) DISCONNECT UNDER LOAD” . 51
127
128 Table 1a – Voltage rating for installation couplers in AC application . 12
129 Table 1b – Voltage rating for installation couplers in DC application . 13
130 Table 2 – Classes of installation couplers . 14
131 Table 3 – Test currents for installation couplers . 25
132 Table 4 – Forces to be applied to cable anchorages . 27
133 Table 5 – Torque applied for the tightening and loosening test. 33
134 Table 6a – Installation couplers intended for use in supply systems with a maximum
135 voltage to earth of 150 V AC, rated impulse voltage 2,5 kV . 34
136 Table 6b – Installation couplers intended for use in supply systems with a maximum
137 voltage to earth of 300 V AC, rated impulse voltage 4,0 kV . 35
138 Table 6c – Installation couplers intended for use in DC supply systems with a
139 maximum voltage to earth of 50 V DC, rated impulse voltage 0,8 kV . 36
140 Table 6d – Installation couplers intended for use in single phase two wire systems
141 120 V DC and single phase three wire systems 240 V DC, rated impulse voltage 2,5 kV. 37
142 Table 6e – Installation couplers intended for use in single phase two wire systems
143 220 V DC and single phase three wire systems 440 V DC, rated impulse voltage 4,0 kV. 38
144 Table C.1 – Sets of samples . 48
145
146

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147 INTERNATIONAL ELECTROTECHNICAL COMMISSION
148 ____________
149
150 INSTALLATION COUPLERS INTENDED FOR PERMANENT
151 CONNECTION IN FIXED INSTALLATIONS
152
153
154 FOREWORD
155 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
156 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
157 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
158 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
159 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
160 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
161 in the subject dealt with may participate in this preparatory work. International, governmental and non-
162 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
163 with the International Organization for Standardization (ISO) in accordance with conditions determined by
164 agreement between the two organizations.
165 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
166 consensus of opinion on the relevant subjects since each technical committee has representation from all
167 interested IEC National Committees.
168 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
169 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
170 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
171 misinterpretation by any end user.
172 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
173 transparently to the maximum extent possible in their national and regional publications. Any divergence
174 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
175 the latter.
176 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
177 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
178 services carried out by independent certification bodies.
179 6) All users should ensure that they have the latest edition of this publication.
180 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
181 members of its technical committees and IEC National Committees for any personal injury, property damage or
182 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
183 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
184 Publications.
185 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
186 indispensable for the correct application of this publication.
187 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
188 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
189 International Standard IEC 61535 has been prepared by MT6 : Installation couplers intended
190 for permanent connection, maintenance of IEC 61535 Ed.1, of IEC technical committee TC23:
191 Electrical accessories.
192 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
193
194 Full information on the voting for the approval of this International Standard can be found in
195 the report on voting indicated in the above table.
196 The second edition constitutes a technical revision and enlargement of scope into Dc
197 application.
198 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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199 The committee has decided that the contents of this document will remain unchanged until the
200 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
201 the specific document. At this date, the document will be
202 • reconfirmed,
203 • withdrawn,
204 • replaced by a revised edition, or
205 • amended.
206

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207 INTRODUCTION
208 This is a second edition of IEC 61535, with some changes and enhancement the field of
209 application of installation couplers into DC-applications and into outdoor applications.
210 For DC-application, only further requirements (marking etc.) are added; no additional test
211 procedures were deemed necessary. However some modifications were necessary in the
212 normative text.
213 The suitable temperature range was added in the scope.
214 The list of normative references was updated and modified into undated references, where
215 possible.
216

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217
218 INSTALLATION COUPLERS INTENDED FOR PERMANENT
219 CONNECTION IN FIXED INSTALLATIONS
220
221
222
223
224 1 Scope
225 This International Standard applies to two up to five wire installation couplers including earth,
226 if provided, with a rated voltage up to and including 500 V AC or DC and a rated connecting
²
227 capacity up to and including 10 mm for permanent connection in electrical installations.
228 Installation couplers with additional contacts for voltages other than mains voltages are
229 outside the scope of this standard.
230 NOTE 1  AC and DC installation couplers according to this standard may be used, for example, in prefabricated
231 buildings, commercial show rooms, installation cavities, such as suspended floors and ceilings, in partition walls
232 and in any similar applications, or cable tray systems, cable ladder systems, cable ducting systems and cable
233 trunking systems or in furniture complying with IEC 60364-7-713.
234 NOTE 2 This standard may be used as a guide for installation couplers with additional contacts for voltages other
235 than mains voltages.
236 NOTE 3 In the UK, where installation couplers have more than 5 wires, they shall meet the requirements of
237 IEC 61535 as though they were included in the scope and shall be tested in such a way that all of the mains
238 voltage pins are subjected to the same level of testing.
239 NOTE 4 In the USA, these installation couplers are not permitted to be used where they will not be visible after
240 installation.
241 An installation coupler consists of an installation female connector and an installation male
242 connector for permanent connection not intended to be engaged or disengaged under load
243 nor to be engaged or disengaged other than during first installation or during reconfiguration
244 or maintenance of the wiring system in which installation couplers have been installed. This
245 means that installation couplers are only intended for infrequent use.
246 Installation couplers are not suitable for use in place of socket-outlet systems. Installation
247 couplers are not suitable for use in place of devices for connecting luminaires (DCLs)
248 according to IEC 61995 or luminaire supporting couplers (LSCs).
249 Installation couplers complying with this document are suitable for use at ambient
250 temperatures not normally exceeding +40 °C, but their average over a period does not exceed
251 +35 °C, with a lower limit of the ambient air temperature of -5 °C, either for indoor or outdoor
252 use.
253 NOTE 5 Additional tests for use in cold climates are under consideration.
254 NOTE 6 For other temperatures necessary information may be given in the manufacturer’s installation
255 instructions.
256 In locations where special conditions prevail, as in ships, vehicles and the like and in
257 hazardous locations, for example where explosions are liable to occur, special constructions
258 may be required.
259 NOTE 7 Particular requirements for installation couplers e.g. for. use at higher ambient temperatures, with higher
260 mechanical durability (e.g. metal housings), with higher fire resistance and for use in control circuits (e.g. SELV),
261 are under consideration.
262 NOTE 8 National rules may have requirements concerning the accessibility of installation couplers.
263 NOTE 9 Installation couplers are intended to be installed by instructed or skilled persons.
264 NOTE 10 National rules may specify who is allowed to carry out the connection and disconnection of installation
265 couplers.
266 NOTE 11 National rules may have requirements concerning installation couplers with metal conduits.
267
268 2 Normative references
269 The following documents are referred to in the text in such a way that some or all of their
270 content constitutes requirements of this document. For dated references, only the edition

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271 cited applies. For undated references, the latest edition of the referenced document (including
272
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