Switches for household and similar fixed electrical installations - Part 2-4: Particular requirements - Isolating switches

Schalter für Haushalt und ähnliche ortsfeste elektrische Installationen - Teil 2-4: Besondere Anforderungen - Trennschalter

Interrupteurs pour installations électriques fixes domestiques et analogues - Partie 2-4: Prescriptions particulières - Interrupteurs-sectionneurs

Stikala za gospodinjstva in podobne nepremične električne inštalacije - 2-4. del: Posebne zahteve - Ločilniki

General Information

Status
Not Published
Publication Date
19-May-2024
Technical Committee
Drafting Committee
Current Stage
4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
Start Date
15-Sep-2023
Completion Date
20-Jan-2023

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Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 60669-2-4:2022
01-december-2022

Stikala za gospodinjstva in podobne nepremične električne inštalacije - 2-4. del:

Posebne zahteve - Ločilniki

Switches for household and similar fixed electrical installations - Part 2-4: Particular

requirements - Isolating switches

Schalter für Haushalt und ähnliche ortsfeste elektrische Installationen - Teil 2-4:

Besondere Anforderungen - Trennschalter

Interrupteurs pour installations électriques fixes domestiques et analogues - Partie 2-4:

Prescriptions particulières - Interrupteurs-sectionneurs
Ta slovenski standard je istoveten z: prEN IEC 60669-2-4:2022
ICS:
29.120.40 Stikala Switches
oSIST prEN IEC 60669-2-4:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60669-2-4:2022
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oSIST prEN IEC 60669-2-4:2022
23B/1415/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60669-2-4 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-10-28 2023-01-20
SUPERSEDES DOCUMENTS:
23B/1370/CD, 23B/1381A/CC
IEC SC 23B : PLUGS, SOCKET-OUTLETS AND SWITCHES
SECRETARIAT: SECRETARY:
Italy Mr Cristiano Masini
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:

Switches for household and similar fixed electrical installations - Part 2-4: Particular

requirements - Isolating switches
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:

Copyright © 2022 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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IEC CDV 60669-2-4 ©IEC 2022 2 23B/1415/CDV
1 CONTENTS
2 INTERNATIONAL ELECTROTECHNICAL COMMISSION
3 ____________
5 SWITCHES FOR HOUSEHOLD AND SIMILAR
6 FIXED ELECTRICAL INSTALLATIONS –
8 Part 2-4: Particular requirements –
9 Isolating switches
12 FOREWORD

13 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

14 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

15 co-operation on all questions concerning standardization in the electrical and electronic f ields. To this end and

16 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

17 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

18 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

19 may participate in this preparatory work. International, governmental and non-governmental organizations liaising

20 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

21 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

22 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

23 consensus of opinion on the relevant subjects since each technical committee has representation from all

24 interested IEC National Committees.

25 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

26 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

27 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

28 misinterpretation by any end user.

29 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

30 transparently to the maximum extent possible in their national and regional publications. Any divergence between

31 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

32 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment

33 declared to be in conformity with an IEC Publication.

34 6) All users should ensure that they have the latest edition of this publication.

35 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

36 members of its technical committees and IEC National Committees for any personal injury, property damage or

37 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

38 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

39 Publications.

40 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

41 indispensable for the correct application of this publication.

42 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

43 rights. IEC shall not be held responsible for identifying any or all such patent rights.

44 International Standard IEC 60669-2-4 has been prepared by subcommittee 23B: Plugs, socket-

45 outlets and switches, of IEC technical committee 23: Electrical accessories.

46 This second edition cancels and replaces the first edition published in 2004 of which it constitutes

47 a technical revision.

48 This edition includes the following significant technical changes with respect to the previous

49 edition:

50 – Revision of the present edition with reference to the published IEC60669-1:2017 Edition

51 4 with its amendments and references to clauses and tables.
52 – Introducing the values for isolating switches with ratings from 6A to 13A.

53 – Introducing a circuit motor load with a rated current not exceeding 10A and a power

54 factor not less than 0.6 in the scope.
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55 – Introduction of a verification test in 16.102 for the effectiveness of an indication of the

56 main contact position
57 – Modification of Tables 1 and 5
58 The text of this standard is based on the following documents:
FDIS Report on voting
23B/xxxx/FDIS 23B/xxxx/RVD

60 Full information on the voting for the approval of this standard can be found in the report on

61 voting indicated in the above table.

62 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

63 This part of IEC 60669 shall be used in conjunction with IEC 60669-1:2017. It lists the changes

64 necessary to convert that standard into a specific standard for isolating switches.

65 When a particular subclause of Part 1 is not mentioned in this part, that subclause applies as

66 far as reasonable.
67 In this publication,
68 • the following print types are used:
69 – requirements proper: in roman type;
70 – test specifications: in italic type;
71 – notes: in smaller roman type;

72 • subclauses, figures, tables or notes which are additional to those in Part 1 are numbered

73 starting from 101. Annexes additional to those in Part 1 are lettered AA, BB, etc.

74 The committee has decided that the contents of this publication will remain unchanged until

75 2008. At this date, the publication will be
76 • reconfirmed;
77 • withdrawn;
78 • replaced by a revised edition, or
79 • amended.
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81 SWITCHES FOR HOUSEHOLD AND SIMILAR
82 FIXED ELECTRICAL INSTALLATIONS –
84 Part 2-4: Particular requirements –
85 Isolating switches
88 1 Scope
89 This clause of Part 1 applies except as follows.
90 Replacement of the first paragraph:

91 This part of IEC 60669 applies to manually operated general purpose isolating switches with a

92 rated voltage not exceeding 440 V and a rated current not exceeding 125 A, intended for

93 household and similar fixed electrical installations, either indoors or outdoors.

94 Replacement of the fifth dash of the fourth paragraph:

95 - a monophase circuit for motor load with a rated current up to 10 A and a power factor not less

96 than 0,6;

98 NOTE Isolating switches are designed for overvoltage category III and used in environment of pollution degree 2

99 according to IEC 60664-1.
100 2 Normative references
101 This clause of Part 1 applies except as follows.
102 Addition:

103 IEC 60669-1:2017, Switches for household and similar fixed electrical installations – Part 1:

104 General requirements

105 IEC 61180:2016, High-voltage test techniques for low voltage equipment – Definitions, test and

106 procedure requirements, test equipment
107 3 Terms and definitions
108 This clause of Part 1 applies except as follows.
109 Additional definitions:
110 3.101
111 isolating switch

112 switch designed to provide isolation of the installation or part of the installation and equipment

113 from the supply and to carry and to make and break the current in all line current carrying poles

114 3.102
115 rated conditional short-circuit current
116 I

117 value of the AC component of a prospective current assigned by the manufacturer, which a

118 switch without integral short-circuit protection, but protected by a suitable short-circuit

119 protective device (hereinafter referred to as SCPD) in series, can withstand under specified

120 conditions of use and behaviour
121
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122 3.103
123 joule integral
124 I t
125 integral of the square of the current over a given time interval (t , t )
0 1
2 2
I t = i dt
126
127 4 General requirements
128 This clause of Part 1 applies.
129 5 General remarks on tests
130 This clause of Part 1 applies except as follows.
131 Replace Table 1 with the following
132 Table 1 – Number of specimens needed for the tests
Number of
additional
Number
Clauses and subclauses specimens for
of specimens
dual current
rating
6 Ratings A
7 Classification A
8 Marking A
9 Checking of dimensions ABC
10 Protection against electric shock ABC
11 Provision for earthing ABC
a,f,l
12 ABC JKL
Terminals
b, m
13 ABC
Constructional requirements
14 Mechanism ABC
15 Resistance to ageing, protection provided by enclosures of
ABC
switches, and resistance to humidity
16 Insulation resistance and electric strength ABC
17 Temperature rise ABC JKL
18 Making and breaking capacity ABC JKL
19 Normal operation JKL
ABC
d,g
20 ABC
Mechanical strength
21 Resistance to heat ABC
22 Screws, current-carrying parts and connections ABC
Creepage distances, clearances and distances through sealing
23 ABC
compound
16.101 XYZ
Impulse test
18.101 Short circuit withstand capability XYZ + PQR
19.2
Test for switches intended for externally ballasted lamp loads DEF MNO
19.3
Test for switches intended for self ballasted lamp loads UVW XYZ
24.1 Resistance to abnormal heat and to fire GHI
24.2 GHI
Resistance to tracking
25 Resistance to rusting GHI
TOTAL 18 9
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Number of
additional
Number
Clauses and subclauses specimens for
of specimens
dual current
rating

Five extra screwless terminals are used for the test of 12.3.11 and one extra set of specimens is used for the

test of 12.3.12.

An extra set of membranes are needed for each of the tests of 13.15.1 and 13.15.2.

One extra set of specimens of switches fitted with pilot light may be used for the tests of Clause 16.

One extra set of specimens of cord-operated isolating switches is needed for the test of 20.10.

One extra set of specimens may be used.

Two extra set of specimens of terminals suitable for rigid and flexible conductors are required for 12.2.5, 12.2.6

and 12.2.7.
One extra set of specimens is needed for the tests of 20.5.1 and 20.5.2.

One extra set of specimens may be used for the tests of 21.2 and 21.3. In this case the specimens shall be

subjected first to the tests of 15.1.

Number of specimens required for insulation-piercing terminals (IPTs) are shown in Table D.1

For switches with pilot light units if the electronic circuitry is so enclosed that the short-circuiting or

disconnecting of components is impossible or difficult, the manufacturer shall provide additional prepared test

specimens.
For isolating switches of pattern number 2 one extra set of specimens is used.

Test to be carried out only if the clearance of item 6 of Clause 23 is lower than 4 mm.

For the test of 18.101 six additional specimens are used.
133
134 6 Ratings
135 This clause of Part 1 applies except as follows.
136 6.2 Modification:
137 In the first paragraph, add the values “80 A, 100 A and 125 A.”
138 6.3 Preferred combinations of number of poles and ratings

139 Replacement in Table 3, first column, last line, of the values “16, 20, 25, 32, 40, and 63” by

140 “equal to or greater than 16”.
141 Additional subclause:

142 6.101 Standard and preferred values of the rated conditional short-circuit current (I )

143 NOTE The associated power-factors are specified in Table 103.
144 6.101.1 Values up to and including 10 000 A
145 The standard values of the rated conditional short-circuit current (I ) are:
146 1 500 A, 3 000 A, 4 500 A, 6 000 A and 10 000 A.
147 6.101.2 Values above 10 000 A
148 The preferred values are:
149 15 000 A, 20 000 A and 25 000 A.
150 Values above 25 000 A are not considered by this standard.
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151 7 Classification
152 This clause of Part 1 applies except as follows.
153 7.1. Addition:
154 Isolating switches shall be only of pattern numbers 1, 2, 3 or 03.
155 7.2 This subclause of Part 1 is not applicable.
156 7.6 Addition:
157 – rail-type
158 8 Marking
159 This clause of Part 1 applies except as follows.
160 8.1 General
161 Modify as follows:
162 f), g) and h) are not applicable
163 Addition:
164 n) symbols for open position (OFF) and closed position (ON),
165 o) symbol for isolating function,
166 p) rated conditional short-circuit current (I ).

167 The manufacturer shall provide reference(s) of one or more short circuit protection devices

168 (SCPDs) in his catalogue and/or in the instructions which are provided with the isolating switch.

169 8.2 Symbols
170 Modify as follows:

171 Symbols for mini-gap construction, micro-gap constructions and without contact gap are not

172 applicable
173 Addition:

174 – isolating function ............................................................................ ...................

175 – rated conditional short-circuit current ............................................................... I

176 8.3 Visibility of markings
177 Addition

178 Isolating switches shall be marked with the symbols for isolating function and for the closed and

179 open position. These markings shall be visible from the front after installation, even after

180 removal of the front cover of the enclosure when the isolating switch is mounted and wired as

181 in normal use. The isolating symbol may be included in a wiring diagram even combined with

182 symbols of other functions, provided that it is visible from the front under the conditions

183 specified.
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184 The marking for the rated conditional short-circuit current (I ) shall be on the isolating switch

185 or in the manufacturer's documentation.
186 8.6 Marking of the switch position
187 Replacement of the first sentence of the first paragraph

188 Isolating switches shall be so marked that the actual contact position is clearly indicated.

189 Deletion of Note 1 and Note 2.
190 9 Checking of dimensions
191 This clause of Part 1 applies.
192 10 Protection against electric shock
193 This clause of Part 1 applies except as follows.
194 10.3.1 Replacement of the first two lines:

195 Accessible parts of isolating switches shall be made of insulating material, with the exception

196 of the following:
197 11 Provision for earthing
198 This clause of Part 1 applies.
199 12 Terminals
200 This clause of Part 1 applies except as follows.
201 12.2.1 Addition to Table 4:

202 Table 4 – Relationship between rated currents and connectable cross-sectional areas

203 of copper conductors
Ranges of rated currents Rigid conductors (solid or stranded)
Nominal cross-sectional areas
Diameter of largest conductor
mm mm
Above 50 up to and including 80 From 10 up to 25 inclusive 6,85
Above 80 up to and including 100 From 16 up to 35 inclusive 7,90
Above 100 up to and including 125 From 25 up to 50 inclusive 9,10
204
205
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206 12.2.5 Replacement of Table 5:
207 Table 5– Tightening torque for verification of the mechanical strength
208 of screw-type terminals
Nominal diameter of thread Torque
mm Nm
1 2 3 4 5
Up to and including 2,8 0,2 – 0,4 0,4 –
Above 2,8 up to and including 3,0 0,25 – 0,5 0,5 –
Above 3,0 up to and including 3,2 0,3 – 0,6 0,6 –
Above 3,2 up to and including 3,6 0,4 – 0,8 0,8 –
Above 3,6 up to and including 4,1 0,7 1,2 1,2 1,2 1,2
Above 4,1 up to and including 4,7 0,8 1,2 1,8 1,8 1,8
Above 4,7 up to and including 5,3 0,8 1,4 2,0 2,0 2,0
Above 5,3 up to and including 6,0 1,2 1,8 2,5 3,0 3,0
Above 6,0 up to and including 8,0 2,5 2,5 3,5 6,0 4,0
Above 8,0 up to and including 10,0 – 3,5 4,0 10,0 6,0
Above 10,0 up to and including 12,0 – 4,0 – – 8,0
Above 12,0 up to and including 15,0 – 5,0 – – 10,0

NOTE 1 Column 1 applies to screws without heads if the screw when tightened does not protrude from the hole,

and to other screws which cannot be tightened by means of a screwdriver with a blade wider than the diameter of

the screw.

Column 2 applies to nuts of mantle terminals which are tightened by means of a screwdriver.

Column 3 applies to other screws which are tightened by means of a screwdriver.

Column 4 applies to nuts of mantle terminals in which the nut is tightened by means other than a screwdriver.

Column 5 applies to screws or nuts, other than nuts of mantle terminals, which are tightened by means other than

a screwdriver.

Where a screw has a hexagonal head with a slot for tightening with a screwdriver and the values of columns 3 and

5 are different, the test is made twice, first applying to the hexagonal head the torque specified in column 5 and

then applying the torque specified in column 3 by means of a screwdriver. If the values of column s 3 and 5 are the

same, only the test with the screwdriver is made.

NOTE 2 For mantle terminals the specified nominal diameter is that of the slotted stud.

NOTE 3 The shape of the blade of the test screwdriver should suit the head of the screw to be tested .

NOTE 4 The screws and nuts should not be tightened in jerks.
209
210 12.2.5 Addition to Table 6:
211 Table 6 – Test values for flexion and pull-out for copper conductors
Conductor Diameter Height H Mass
a b
cross-sectional area of bushing hole mm for conductor
mm mm kg
35 14,5 320 6,8
50 16 340 9,5
212
213
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214 12.2.6 Addition to Table 7:
215 Table 7 – Test values for pulling out test
Cross-
sectional
area of
conductors
connected to
35 50
the terminal
Pull 190 235
216
217 13 Constructional requirements
218 This clause of Part 1 applies except as follows.
219 13.12 Addition to Table 13:
220 Table 13 – External cable diameter limits for surface type switches
Limits of external diameter
Cross-sectional
Rated
of cables
Number
areas
current
of conductors
2 Minimum Maximum
mm mm
2 —
80 3 37,1
16 up to and including 35 15,5
100 4 41,1
5 —
2 —
3 42,9
125 25 up to and including 50 18,5
4 47,5
5 —
221
222 Addition
223 13.101 Indication of the contact position

224 Isolating switches when in the open position shall provide an isolation distance in accordance

225 with the requirements necessary to satisfy the isolating function.

226 Indication of the contact position shall be provided by the position of the actuating member

227 and/or by suitable means.
228 NOTE A pilot light alone is not considered as suitable means.

229 The actuating member shall be connected to the moving contacts in a reliable way. The

230 actuating member shall not indicate the open position unless all the moving contacts are in the

231 open position.

232 Isolating switches shall be so designed that the actuating member can only be fitted in a manner

233 which ensures correct contact position and correct locking if the isolating switch is provided

234 with means for locking. When means are provided or specified by the manufacturer to lock the

235 isolating switch in the open position, locking in that position shall only be possible when the

236 contacts are in the open position.
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237 Compliance is checked by inspection and by the tests of clause 16.101 and 16.102.

238 14 Mechanism
239 This clause of Part 1 applies.
240 15 Resistance to ageing, protection provided by enclosures of switches and
241 resistance to humidity
242 This clause of Part 1 applies.
243 16 Insulation resistance and electric strength
244 This clause of Part 1 applies except as follows.
245 Addition
246 16.101 Impulse voltage test
247 Isolating switches shall be suitable for isolation.
248 Compliance is checked by the following test.
249 The test is performed on new specimens, in clean and dry conditions.

250 The 1,2/50 impulse voltage according to Figure 1 of IEC 61180:2016 is applied between the

251 line terminals connected together and the load terminals connected together with the contacts

252 in the open position.

253 The impulses are given by a generator producing positive and negative impulses having a front

254 time of 1,2 µs and a time to half value of 50 µs, the tolerances being
255 ± 5 % for the peak value;
256 ± 30 % for the front time;
257 ± 20 % for the time to half value.

258 The shape of the impulses is adjusted with the isolating switch under test connected to the

259 impulse generator. For this purpose appropriate voltage dividers and voltage sensors shall be

260 used.

261 Small oscillations in the impulses are allowed, provided that their amplitude near the peak of

262 the impulse is less than 5 % of the peak value.

263 For oscillations on the first half of the front, amplitudes up to 10 % of the peak value are allowed.

264 The test voltage shall be chosen from Table 101, in accordance with the rated voltage of the

265 isolating switch.
266 The impulse voltage shall be applied 3 times at intervals of 1 s minimum.
267 There shall be no discharges during the test.
268 The surge impedance of the test apparatus should be 500 Ω.

269 NOTE The expression “discharge“ is used to cover the phenomena associated with the failure of insulation under

270 electric stress, which includes current flow and a drop in voltage.
271
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272 Table 101 – Test voltage and corresponding altitudes
Rated voltage Test voltage [kV] and corresponding altitudes above sea level [m]
V Sea level 200 500 1 000 2 000
Not exceeding
3,5 3,5 3,4 3,2 3
130 V
Exceeding
6,2 6 5,8 5,6 5
130 V
273

274 16.102 Verification of the effectiveness of indication of the main contact position

275 The force necessary to operate the device to the open position shall be measured at the

276 extremity of the actuator. The measured force F shall be equal to the average value of maximum

277 force obtained from three consecutive operations, with the device in a clean and new condition.

278 This force F shall then be used for the establishment of the test force in Table 102.

279 With the equipment in the closed position, the fixed and moving contacts of the pole for which

280 the test is deemed to be the most severe shall be fixed together, for example, by welding.

281 The actuator shall be submitted to a test force of 3F but which, however, shall not be less than

282 the minimum nor more than the maximum values given in Table 102, corresponding to the type

283 of actuator.

284 Where the device has more than one contact system in series, all contact systems that are in

285 series shall be held in the closed position.

286 In the case of multiple tip contact systems, the least number of parallel contact tips shall be

287 fixed together as necessary to hold the contact system closed in order to allow the test force to

288 be applied without the contacts separating.

289 The appropriate means to keep the contact(s) closed and the number of contacts shall be

290 specified by the manufacturer. The number of contacts and the method shall be stated in the

291 report.

292 The test force shall be applied without shock to the extremity of the actuator, for a period of 10

293 s, in the direction to open the contacts.

294 The direction of the test force with respect to the actuator, as shown in Figure 105, shall be

295 maintained throughout the test.

296 After the test, when the test force is no longer applied, the actuator being left free, the open

297 position shall not be indicated by any of the means provided and the equipment shall not show

298 any damage such as to impair its normal operation.

299 When the equipment is provided with a means of locking in the open position, it shall not be

300 possible to lock the equipment while the test force is applied.
301
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302 Table 102 – Actuator test force
a a
Minimum test Maximum test
Type of actuator Test force
Force Force
N N
Push-button (a) 3F 50 150
One-finger operated (b) 3F 50 150
Two-finger operated (c) 3F 100 200
One-hand operated (d) and (e) 3F 150 400
Two-hand operated (f) and (g) 3F 200 600

F is the normal operating force in new condition. The test force shall be 3F with the stated minimum and

maximum values and be applied as shown in Figure 106.
303
304 17 Temperature rise
305 This clause of Part 1 applies except as follows.
306 17.1 General
307 Addition toTable 16:
308 Table 16 – Temperature-rise test currents and cross-sectional areas
309 of copper conductors
Nominal cross-sectional
Rated current Test current area of conductors
A A
80 90 25
100 115 35
125 145 50
310

311 Replacement in note a of Table 16 of the word “switches” by “isolating switches”.

312 Replacement of the penultimate paragraph before Note 3:

313 The temperature rise of the terminals shall not exceed 45 K for isolating switches having rated

314 current up to and including 63 A, 65 K for isolating switches having rated current greater than

315 63 A.
316 18 Making and breaking capacity
317 This clause of Part 1 applies except as follows.
318 Addition
319 18.101 Short-circuit withstand capability tests
320 Six new specimens are used for this test.

321 The test is intended to verify that the isolating switch is able to withstand, without damage,

322 short-circuit currents up to and including its rated conditional short-circuit current.

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oSIST prEN IEC 60669-2-4:2022
IEC CDV 60669-2-4 ©IEC 2022 14 23B/1415/CDV
323 18.101.1 General conditions for test

324 The conditions of 18.101 are applicable to any test intended to verify the behaviour of the

325 isolating switches under short-circuit conditions.
326 a) Test circuit

327 Figures 101, 102, 103 and 104 respectively give diagrams of the circuits to be used for the

328 tests concerning:
329 – a single pole isolating switch;
330
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