Bsi bs en 60998 2 4 2005

untitled BRITISH STANDARD BS 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 The Eur[.]

Connecting devices for

low voltage circuits for

household and similar

purposes —

Part 2-4: Particular requirements for

twist-on connecting devices

The European Standard EN 60998-2-4:2005 has the status of a

British Standard

ICS 29.120.20

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This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee

on 9 November 2005

National foreword

This British Standard is the official English language version of

EN 60998-2-4:2005 It was derived by CENELEC from IEC 60998-2-4:2004 It supersedes BS EN 60998-2-4:1993 which will be withdrawn on 1 March 2008.The CENELEC common modifications have been implemented at the

appropriate places in the text The start and finish of each common modification is indicated in the text by tags   Where a common modification has been introduced by amendment, the tags carry the number of the amendment For example, the common modifications introduced by CENELEC amendment A11 are indicated by ‚

The UK participation in its preparation was entrusted to Technical Committee PEL/23/2, Connecting devices, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

— aid enquirers to understand the text;

— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed;

— monitor related international and European developments and promulgate them in the UK

Amendments issued since publication

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

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

basse tension pour usage domestique

et analogue

Partie 2-4: Règles particulières pour

dispositifs de connexion par épissure

(CEI 60998-2-4:2004, modifiée)

Niederspannungs-Stromkreise für Haushalt und ähnliche Zwecke Teil 2-4: Besondere Anforderungen an Drehklemmen

(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

© 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

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

CONTENTS

1 Scope 4

2 Normative references 4

3 Terms and definitions 4

4 General 5

5 General notes on tests 5

6 Main characteristics 6

7 Classification 6

8 Marking 6

9 Protection against electric shock 7

10 Connection of conductors 7

11 Construction 8

12 Resistance to ageing, to humid conditions, to ingress of solid foreign objects and to harmful ingress of water 8

13 Insulation resistance and electric strength 9

14 Mechanical strength 10

15 Temperature rise 13

16 Resistance to heat 16

17 Clearances and creepage distances 16

18 Resistance of insulating material to abnormal heat and fire 16

19 Resistance of insulating material to tracking 16

20 EMC requirements 16

Annex A (informative) Example for temperature cycling test according to 15.102.1 20

Annex ZA (normative) Normative references to international publications with their corresponding European publications 22

Annex ZB (normative) Special national conditions 22

Figure 101 – Gripping dimension 17

Figure 102 – Examples of torque calculations of 14.103 18

Figure 103 – Example for the application of the pull-out force in the axis of TOCD 18

Figure 104 – Test apparatus according to 14.101 19

Figure AA.1 – Example for temperature cycling test according to 15.102.1 for TOCDs designed to accept all type of conductors 20

Table 101 – Number of new samples and sequence applicable to the tests 5

Table 102 – Relationship between mass, height and cross-sectional area of conductors 11

Table 103 – Number of conductors to be removed 11

Table 104 – Relationship between pull force and cross-sectional area of conductors 13

CONNECTING DEVICES FOR LOW-VOLTAGE CIRCUITS

FOR HOUSEHOLD AND SIMILAR PURPOSES – Part 2-4: Particular requirements for twist-on connecting devices

NOTE Z1 See Annex ZB for special national conditions.

2 Normative references

This clause of Part 1 is applicable

3 Terms and definitions

This clause of Part 1 is applicable, except as follows:

range of TOCD's connecting capacity

the smallest and the largest individual conductors (expressed in mm2 text deleted) 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

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

Sets Number of new samples

per set

Clauses or subclauses Test sequence

9

Marking Protection against electric chock

14.102 and 14.103

Connection of conductors Torque and pull-out test

E 6 14.101.1 Clamping with reduced number of conductors

F 3 14.2 Mechanical strength (tumbling barrel)

H 6 or 12 15.102.1 Temperature cycling test

I 3 15.102.2 Short-time withstand current test

18

Resistance to heat 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

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

• 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 stated in mm2 text deleted;

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:

n mm2 or n for range of TOCD's connecting capacity

text deleted

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

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 setting material

thermo-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 t = 4 U i + 1 000 (V) where

U t is the test voltage;

U i is the rated insulation voltage

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 subjected to

the following test:

The test voltage is applied between the conductors and the outer electrode for 1 min and then within 3 s increased to the maximum voltage and then immediately removed The voltages are defined by the following formulas:

U t = 4 U i + 1 000 (V)

U max = 10 U i + 1 000 (V) where

U t is the test voltage (1 min);

U i is the rated insulation voltage;

U max is the maximum voltage

During the test, no flash-over between the conductors and the outer electrode shall occur These tests are also used to prove compliance with the requirements of Clauses 12 and 17

14 Mechanical strength

This clause of Part 1 is applicable, except as follows:

14.1 Replacement of the second paragraph:

Compliance is checked for a TOCD of ceramic or thermosetting material by the test of 14.2

NOTE A TOCD of thermoplastic material is deemed to comply without testing due to its material and construction

14.3 This subclause of Part 1 does not apply

Addition:

14.101 A TOCD shall be so designed and constructed that it clamps the conductors

without causing them any undue damage

Compliance is checked by the following test:

Three new samples shall be tested with the smallest conductor cross-sectional area and the smallest number of conductors which can be clamped simultaneously The torques required

in 14.103 shall be used Three new samples shall be tested with the largest conductor cross-sectional area and the largest number of conductors which can be clamped simultaneously

The length of the conductors shall be 75 mm longer than the height (H) specified in Table 102 and shown in Figure 104

Each of the conductors is subjected to the following test:

The end of a conductor shall be passed through an appropriate sized bushing in a platen positioned at a height (H) below the equipment as given in Table 102 The bushing shall be positioned, in a horizontal plane, such that its centre line describes a circle of 75 mm diameter, concentric with the centre of the TOCD, in the horizontal plane The platen is then rotated at a rate of (10 ± 2) r/min

The distance between the mouth of the TOCD and the upper surface of the bushing, shall

be within 15 mm of the height indicated in Table 102 The bushing may be lubricated to prevent binding, twisting or rotation of the insulated conductor A mass, as specified in Table 102, shall be suspended from the end of the conductor The duration of the test shall

be 15 min, the direction of rotation of the platen shall be the reverse of that used for unscrewing the TOCD

text deleted

During the test, the conductor shall neither slip out of the TOCD, nor break near the TOCD

After disconnection of the TOCD, any damage to the ends of the conductors shall not be such as to impair a re-connection

Table 102 – Relationship between mass, height and cross-sectional area of conductors

Conductor cross-section

mm2

Diameter of bushing hole a

kg 0,5

0,75 1,0 1,5 2,5 4,0 6,0 10,0 16,0

6,5 6,5 6,5 6,5 9,5 9,5 9,5 9,5 13,0

a If the bushing hole diameter is not large enough to accommodate the conductors

1,5 mm 2 and 10,0 mm 2 without binding, a bushing having the next larger hole size

may be used.

b Tolerance for height H: ±15 mm

aNOTE Z1 See Annex ZB for special national conditions.

14.101.1 Three new TOCDs are fitted with the largest number of smallest solid conductors

tightened with the torque given in 14.103 The TOCDs are then disconnected and one or, respectively, two conductors, as specified in Table 103, are removed from each TOCD The same TOCDs are then connected again to the remaining conductors and are tightened again with the torque given in 14.103 Immediately afterwards, the TOCDs are subjected to the pull-out test according to 14.103

Table 103 – Number of conductors to be removed Largest number of smallest