SIST EN 60998-2-4:2006

SLOVENSKI SIST EN 60998-2-4:2006

STANDARD
januar 2006
Povezovalne naprave v nizkonapetostnih tokokrogih za uporabo v
gospodinjstvu in podobne namene – 2-4. del: Posebne zahteve za ovijalne
povezovalne naprave (IEC 60998-2-4:2004, spremenjen)
(istoveten EN 60998-2-4:2005)
Connecting devices for low voltage circuits for household and similar purposes –
Part 2-4: Particular requirements for twist-on connecting devices (IEC 60998-2-
4:2004, modified)
ICS 29.120.20 Referenčna številka
SIST EN 60998-2-4:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 60998-2-4
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2005

ICS 29.120.20 Supersedes EN 60998-2-4:1993


English version


Connecting devices for low voltage circuits
for household and similar purposes
Part 2-4: Particular requirements for twist-on connecting devices
(IEC 60998-2-4:2004, modified)


Dispositifs de connexion pour circuits Verbindungsmaterial für
basse tension pour usage domestique Niederspannungs-Stromkreise für
et analogue Haushalt und ähnliche Zwecke
Partie 2-4: Règles particulières pour Teil 2-4: Besondere Anforderungen an
dispositifs de connexion par épissure Drehklemmen
(CEI 60998-2-4:2004, modifiée) (IEC 60998-2-4:2004, modifiziert)



This European Standard was approved by CENELEC on 2005-03-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60998-2-4:2005 E

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EN 60998-2-4:2005 - 2 -
Foreword
The text of the International Standard IEC 60998-2-4:2004, prepared by SC 23F, Connecting devices,
of IEC TC 23, Electrical accessories, together with common modifications prepared by the CENELEC
Reporting Secretariat SR 23F, was submitted to the formal vote and was approved by CENELEC as
EN 60998-2-4 on 2005-03-01.
This European Standard supersedes EN 60998-2-4:1993.
It introduces an additional explanation for the temperature cycling test.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-03-01
– latest date by which the national standards conflicting with
the EN have to be withdrawn (dow) 2008-03-01
This Part 2-4 is intended to be used in conjunction with EN 60998-1:2004.
It supplements or modifies the corresponding clauses of EN 60998-1 so as to convert it into the
European Standard: Particular requirements for twist-on connecting devices.
Where a particular subclause of Part 1 is not mentioned in this Part 2-4, that subclause applies as far as
is reasonable. Where this Part 2-4 states "addition", "modification" or "replacement", the relevant text of
Part 1 is to be adapted accordingly.
In this standard
a) the following print types are used:
- requirements proper: in roman type,
- test specifications: in italic type,
- explanatory matter: in smaller roman type;
b) the following numbering system is used:
- subclauses and figures which are additional to those in Part 1 are numbered starting from 101,
- additional annexes are lettered AA, BB, etc.,
- annexes and notes which are additional to those in IEC 60998-2-4 are prefixed with the letter
"Z".
__________

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- 3 - EN 60998-2-4:2005
Endorsement notice
The text of the International Standard IEC 60998-2-4:2004 was approved by CENELEC as a
European Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
1 Delete the Note.
Add:
NOTE Z1  See Annex ZB for special national conditions.
3.102 Delete " or AWG".
8.1 Delete the Note.
8.1 Delete " or AWG".
2nd dash c)
8.3 Delete the Note.
14.101 Delete the Note.
14.101 Delete the Note.
Table 102
Add:
NOTE Z1  See Annex ZB for special national conditions.
14.103 Delete the Note.
Table 104
Add:
NOTE Z1  See Annex ZB for special national conditions.
14.103 Delete "North American".
Note
15.102.1 Delete Note 3.
Bibliography Add the following note for IEC 60999-1:
NOTE Z1  Harmonized as EN 60999-1:2000 (not modified).
__________

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EN 60998-2-4:2005 - 4 -
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
Annex ZA of Part 1 is applicable.
__________

Annex ZB
(normative)

Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a
long period, e.g. climatic conditions, electrical earthing conditions.
NOTE  If it affects harmonization, it forms part of the European Standard.
For the countries in which the relevant special national conditions apply these provisions are
normative, for other countries they are informative.
Clause Special national condition
1 United Kingdom
In the UK, TOCDs must also be suitable for connecting two or more unprepared flexible
2
cables, including a flexible cable having a cross sectional area of 1,25 mm complying
with BS 6500.
14.101 United Kingdom
Table 102
2
In the UK, the following additional row covering 1,25 mm applies:
1,25            6,5            260            0,4
14.103 United Kingdom
Table 104
2
In the UK, the following additional row covering 1,25 mm applies:
1,25               60
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NORME CEI
INTERNATIONALE
IEC



60998-2-4
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2004-09


PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Dispositifs de connexion pour circuits
basse tension pour usage domestique
et analogue –
Partie 2-4:
Règles particulières pour
dispositifs de connexion par épissure

Connecting devices for low-voltage circuits
for household and similar purposes –
Part 2-4:
Particular requirements for
twist-on connecting devices

 IEC 2004 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photo-copie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
T
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60998-2-4  IEC:2004 – 3 –
CONTENTS
FOREWORD.5

1 Scope.11
2 Normative references.11
3 Terms and definitions .11
4 General.13
5 General notes on tests .13
6 Main characteristics.15
7 Classification.15
8 Marking.15
9 Protection against electric shock .17
10 Connection of conductors.17
11 Construction.19
12 Resistance to ageing, to humid conditions, to ingress of solid foreign objects and
to harmful ingress of water .19
13 Insulation resistance and electric strength .21
14 Mechanical strength.23
15 Temperature rise.29
16 Resistance to heat.35
17 Clearances and creepage distances .35
18 Resistance of insulating material to abnormal heat and fire .35
19 Resistance of insulating material to tracking.35
20 EMC requirements.35

Annex AA (informative) Example for temperature cycling test according to 15.102.1.45

Figure 101 – Gripping dimension .37
Figure 102 – Examples of torque calculations of 14.103 .39
Figure 103 – Exemple for the application of the pull-out force in the axis of TOCD.41
Figure 104 – Test apparatus according to 14.101 .43
Figure AA.1 – Example for temperature cycling test according to 15.102.1 for TOCDs
designed to accept all type of conductors .45

Table 101 – Number of new samples and sequence of the tests .13
Table 102 – Relationship between mass, height and cross-sectional area of conductors.25
Table 103 – Number of conductors to be removed .25
Table 104 – Relationship between pull force and cross-sectional area of conductors .29

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60998-2-4  IEC:2004 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

CONNECTING DEVICES FOR LOW-VOLTAGE CIRCUITS
FOR HOUSEHOLD AND SIMILAR PURPOSES –

Part 2-4: Particular requirements for
twist-on connecting devices


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60998-2-4 has been prepared by sub-committee 23F: Connecting
devices, of IEC technical committee 23: Electrical accessories.
This second edition cancels and replaces the first edition published in 1993 and constitutes
a technical revision. This edition introduces an additional explanation for the temperature
cycling test.
It has the status of a group safety publication in accordance with IEC Guide 104.

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60998-2-4  IEC:2004 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
23F/162/FDIS 23F/164/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard constitutes Part 2-4 of the IEC 60998 series, published under the general title
Connecting devices for low voltage circuits for household and similar purposes. This series
consists of Part 1, devoted to general requirements, and various parts 2, devoted to particular
requirements.
At the moment of the publication of this part, the following parts had already been published.
Part 1: General requirements
Part 2-1: Particular requirements for connecting devices as separate entities with screw-
type clamping units
Part 2-2: Particular requirements for connecting devices as separate entities with
screwless-type clamping units
Part 2-3: Particular requirements for connecting devices as separate entities with insulation
piercing clamping units
Part 2-4: Particular requirements for twist-on connecting devices
Part 2-5: Particular requirements for connecting boxes (junction and/or tapping) for
terminals or connecting devices.
This Part 2-4 is intended to be used in conjunction with IEC 60998-1. It was established on
the basis of the second edition (2002) of that standard.
It supplements or modifies the corresponding clauses in IEC 60998-1 so as to convert that
publication into the IEC standard: Particular requirements for twist-on connecting devices.
Where a particular subclause of Part 1 is not mentioned in this Part 2-4, that subclause
applies as far as is reasonable. Where this standard states "addition", "modification" or
"replacement", the relevant requirements, test specification or explanatory matter in Part 1
should be adapted accordingly.
In this standard:
a) the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
b) subclauses and figures which are additional to those in Part 1 are numbered starting from
101; additional annexes are lettered AA, BB, etc.

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60998-2-4  IEC:2004 – 9 –
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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60998-2-4  IEC:2004 – 11 –
CONNECTING DEVICES FOR LOW-VOLTAGE CIRCUITS
FOR HOUSEHOLD AND SIMILAR PURPOSES –

Part 2-4: Particular requirements for
twist-on connecting devices



1 Scope
Replacement:
This International Standard applies to twist-on connecting devices for connecting two or more
2
unprepared rigid and/or flexible copper conductors having a cross-sectional area of 0,5 mm
2
up to and including 16 mm and complying with IEC 60228, the total cross-sectional area of
2
the connected conductors not exceeding 35 mm .
It covers low voltage circuits up to 1 000 V a.c. and 1 500 V d.c. where electrical energy is
utilized for household and similar purposes.
This standard covers TOCDs primarily designed for application by hand. However, certain
TOCDs, for example for large cross-sections, may require the use of a tool designed for that
particular TOCD.
NOTE In the UK, TOCDs must also be suitable for connecting 2 or more unprepared flexible cables, including a
2
flexible cable having a cross sectional area of 1,25 mm complying with BS 6500. Wires and cables in the USA do
not presently comply to IEC 60228.
2 Normative references
This clause of Part 1 is applicable.
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Additional definitions:
3.101
twist-on connecting device
TOCD
terminal which is twisted on the ends of two or more conductors
3.102
range of TOCD's connecting capacity
2
the smallest and the largest individual conductors (expressed in mm or AWG) used in pairs
of equal size capable of being safely connected as specified by the manufacturer. This does
not exclude the use of more than two conductors in the TOCD or the use of conductors of
sizes outside the specified range of connecting capacity.

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60998-2-4  IEC:2004 – 13 –
3.103
gripping dimension
diameter
maximum dimension of the TOCD perpendicular to the aperture for the conductors (see
Figure 101).
4 General
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable, except as follows:
5.4 Replacement:
The necessary number of new samples to be submitted to the tests is divided into sets as
detailed in Table 101.
The tests are carried out in the sequence listed for each set.
Table 101 – Number of new samples and sequence applicable to the tests
Number of new samples Clauses or
Sets Test sequence
per set subclauses
A 3 8 Marking
9 Protection against electric chock
B 3 to 48 10 Connection of conductors
14.102 and 14.103 Torque and pull-out test
C 12 or 24 12 Resistance to ageing and to humidity
13 Insulation resistance and electric strength
D 6 14.101 Clamping without undue damage to the
conductors
E 6 14.101.1 Clamping with reduced number of conductors
F 3 14.2 Mechanical strength (tumbling barrel)
G 6 15.101 Temperature rise
H 6 or 12 15.102.1 Temperature cycling test
I 3 15.102.2 Short-time withstand current test
K 3 16 Resistance to heat
18 Resistance to abnormal heat and fire

If insufficient samples are available according to Table 101, sets B and C may be combined
but, in this case, the tests of Clause 13 have to be made first.

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60998-2-4  IEC:2004 – 15 –
6 Main characteristics
This clause of Part 1 is applicable except as follows:
Addition:
6.101 The preferred additional values of rated insulation voltage are 300 V and 600 V.
7 Classification
This clause of Part 1 is not applicable, except for subclause 7.5.
Addition:
7.101 Classification according to type and combinations of conductors
– TOCD for rigid (solid or stranded) conductors;
– TOCD for flexible conductors;
– TOCD for the combination of rigid (solid or stranded) and flexible conductors.
8 Marking
This clause of Part 1 is applicable, except as follows:
8.1 Replacement:
For a TOCD, the following markings apply.
• The following shall be marked on the TOCD:
a) manufacturer's or responsible vendor's name, trade mark or identification mark;
b) type reference, catalogue number or part number;
c) range of TOCD's connecting capacity;
d) rated insulation voltage.
NOTE In the USA it is not mandatory to mark the insulation voltage on the TOCD.
Example:
2
A TOCD designed for the connection of a minimum of two conductors of 2,5 mm up to
2 2
and including two conductors of 6 mm shall be marked: 2,5-6 mm .
For very small devices, with a surface insufficient for complete marking, only a) and b)
need to be marked on the TOCD.
• In addition, the following shall be marked on the smallest package unit or on an instruction
or information sheet packed within the smallest package unit:
a) manufacturer's or responsible vendor's name, trade mark or identification mark;
b) type reference, catalogue number or part number;
c) allowable conductor combinations and the range of TOCD's connecting capacity as
2
stated in mm or AWG;

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60998-2-4  IEC:2004 – 17 –
d) type(s) of conductor(s) for which the TOCD is designed;
e) maximum ambient temperature of use if greater than 40 °C (according to 7.5 of Part 1);
f) rated insulation voltage;
g) insulation strip length;
h) connection procedure including proper usage of tool, if required.
8.2 Not applicable.
8.3 Replacement of the third line:
2
n mm or n for range of TOCD's connecting capacity.
NOTE For the range of TOCD's connecting capacity in AWG, figures may be used alone.
9 Protection against electric shock
This clause of Part 1 is applicable, except as follows:
Replacement of the second paragraph:
The TOCD shall be connected to two conductors of the smallest cross-section of the range of
TOCD's connecting capacity.
10 Connection of conductors
This clause of Part 1 is applicable, except as follows:
Addition:
10.101 It shall be possible to connect the number and the cross-sections of rigid (solid or
stranded) and/or flexible conductors to a TOCD as specified by the manufacturer.
10.102 A TOCD shall allow the correct connection by insertion of a bunched set of
conductors followed by twisting of the TOCD.
Compliance with 10.101 and 10.102 is checked by inspection, after fitting the TOCD as
specified by hand or as specified by the manufacturer, to the combinations of conductors as
required in 14.101. The bunch of conductors to be connected may be formed – but not pre-
twisted – to allow insertion into the TOCD.
In case of doubt, compliance is checked by applying the torques required in 14.103. In all
cases, new conductors and samples shall be used. The test may be combined with the test of
14.101.
10.103 The disconnection of a conductor from a TOCD shall require an operation other than
a pull on the conductor.
Compliance is checked by the tests of 14.101 and 14.102.

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60998-2-4  IEC:2004 – 19 –
11 Construction
This clause of Part 1 is applicable, except as follows:
Subclauses 11.2 to 11.5 inclusive are not applicable.
11.6 Addition:
Although metallic parts of a TOCD may not be intended to carry current, for the purpose of
this subclause they shall be treated as current-carrying parts.
Additional subclauses:
11.101 The shape of the aperture of a TOCD shall be such that, after connection has been
completed, the insulation of the conductors is completely covered by the insulating material of
the TOCD over a sufficient length so as to ensure adequate external insulation.
Compliance is checked by the tests of Clause 13.
11.102 It shall not be possible to detach the insulating part from the live part or the
conductor ends inadvertently even during disconnection.
Compliance is checked by manual test and the tests of Clause 14.
12 Resistance to ageing, to humid conditions, to ingress of solid foreign
objects and to harmful ingress of water
This clause of Part 1 is applicable except as follows:
12.1 Addition:
Add the following test specification after note 1:
The test is carried out on 12 samples: six samples secured to the maximum number of
conductors of the minimum cross-sectional area and another six samples secured to the
maximum number of conductors of the maximum cross-sectional area, the connection being
made in the intended manner by applying the torque according to 14.103.
The test is also carried out on another set of 12 samples without conductors connected.
12.2 Addition:
Add the following test specification after the second paragraph:
The test is carried out on the same samples as in 12.1.
This test is also carried out on 12 samples with insulating material of ceramic or thermo-
setting material.

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60998-2-4  IEC:2004 – 21 –
Replace the fourth paragraph by the following:
TOCDs are kept in the humidity chamber for 48 h.
Add the following test specification after the second paragraph of the note:
After the humidity treatment, and still with the samples in the humidity chamber, the 12
samples which were not connected to conductors during the ageing test according to 12.1
and the 12 TOCDs of ceramic or of thermosetting material are secured to conductors, six
samples with the maximum number of conductors of the minimum cross-sectional area, and
six samples with the maximum number of conductors of the maximum cross-sectional area.
12.3 Not applicable.
13 Insulation resistance and electric strength
Replacement:
13.1 The insulation resistance and the electric strength of a TOCD shall be adequate.
Compliance is checked by the tests of 13.2, 13.3 and 13.4 on the samples that have been
subjected to the ageing test according to 12.1 and immediately after the humidity test
according to 12.2, with the samples still in the humidity chamber or in the room in which the
samples were brought to the prescribed temperature.
13.2 The insulation resistance test is under consideration.
13.3 Each sample shall be embedded in 1,0 mm to 1,5 mm diameter lead shot or wrapped
in metal foil that serves as an outer electrode. The TOCD shall be placed in the electrode to
the edge of the skirt, such that all of the insulating material is embedded. However, care
should be taken that the foil is not pressed into the TOCD.
An a.c. test voltage according to the following formula is applied for 1 min between the
conductors and the outer electrode:
U = 4 U + 1 000 (V)
t i
where
U is the test voltage;
t
U is the rated insulation voltage.
i
During the test, no breakdown of the insulation of the TOCD shall occur. Glow discharges
without a drop in voltage are disregarded.
13.4 The set of 12 samples subjected to the ageing test without conductors is
...