Low-voltage switchgear and controlgear assemblies - Part 1: General rules

IEC 61439-1:2020 is available as IEC 61439-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61439-1:2020 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies. NOTE Throughout this document, the term assembly(s) (see 3.1.1) is used for a low-voltage switchgear and controlgear assembly(s). For the purpose of determining assembly conformity, the requirements of the relevant part of the IEC 61439 series, Part 2 onwards, apply together with the cited requirements of this document. For assemblies not covered by Part 3 onward, Part 2 applies. This third edition cancels and replaces the second edition published in 2011. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) clarification that power electric converter systems, switch mode power supplies, uninterruptable power supplies and adjustable speed power drive systems are tested to their particular products standard, but when they are incorporated in assemblies the incorporation is in accordance with the IEC 61439 series of standards; b) introduction of a group rated current for circuits within a loaded assembly and the refocusing of temperature-rise verification on this new characteristic; c) addition of requirements in respect of DC; d) introduction of the concept of class I and class II assemblies regarding protection against electric shock.

Niederspannungs-Schaltgerätekombinationen - Teil 1: Allgemeine Festlegungen

Ensembles d’appareillage à basse tension - Partie 1: Règles générales

IEC 61439-1:2020 est disponible sous forme de IEC 61439-1:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L’IEC 61439-1:2020 formule les définitions générales et les conditions d’emploi, les exigences de construction, les caractéristiques techniques et les exigences de vérification pour les ensembles d’appareillage à basse tension. NOTE Dans le présent document, le terme ensemble(s) (voir 3.1.1) est utilisé pour désigner un ou des ensembles d’appareillage à basse tension. Dans le but de déterminer la conformité de l’ensemble, les exigences de la partie applicable de la série IEC 61439 (à partir de la Partie 2), s’appliquent, de même que les exigences citées dans le présent document. Pour les ensembles non couverts par les parties à partir de la Partie 3, la Partie 2 s’applique. Cette troisième édition annule et remplace la deuxième édition parue en 2011. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) clarification du fait que les systèmes et matériels électroniques de conversion de puissance, les alimentations à découpage, les alimentations sans interruption et les systèmes d’entraînements électriques de puissance à vitesse variable sont soumis à essai conformément à leur propre norme de produit, mais que lorsqu’ils sont incorporés dans des ensembles, l’incorporation est conforme à la série de normes IEC 61439; b) introduction d’un courant assigné de groupe pour les circuits au sein d’un ensemble chargé et recentrage de la vérification de l’échauffement sur cette nouvelle caractéristique; c) ajout d’exigences relatives au courant continu; d) introduction du concept d’ensembles de classe I et de classe II en matière de protection contre les chocs électriques.

Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 1. del: Splošna pravila

General Information

Status
Published
Current Stage
6060 - Document made available
Due Date
21-May-2021
Completion Date
21-May-2021

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SLOVENSKI STANDARD
oSIST prEN IEC 61439-1:2019
01-maj-2019
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 1. del: Splošna pravila
Low-voltage switchgear and controlgear assemblies - Part 1: General rules
Niederspannungs-Schaltgerätekombinationen - Teil 1: Allgemeine Festlegungen
Ensembles d'appareillage à basse tension - Partie 1: Règles générales
Ta slovenski standard je istoveten z: prEN IEC 61439-1:2019
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
oSIST prEN IEC 61439-1:2019 en

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

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oSIST prEN IEC 61439-1:2019
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oSIST prEN IEC 61439-1:2019
121B/80/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61439-1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2019-03-08 2019-05-31
SUPERSEDES DOCUMENTS:
121B/71/CD,121B/76/CC
IEC SC 121B : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
SECRETARIAT: SECRETARY:
Germany Mr André Kling
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 22G,TC 44,SC 121A
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
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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:
Low-voltage switchgear and controlgear assemblies - Part 1: General rules
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
SC 121B Officer support circulation of CDV for project IEC 61439-1 ED3.

Secretary note: NCs are kindly requested to refer their comments to line numbers.

Copyright © 2019 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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1 CONTENTS

3 FOREWORD ........................................................................................................................... 9

4 INTRODUCTION ................................................................................................................... 11

5 1 Scope ............................................................................................................................ 12

6 2 Normative references .................................................................................................... 12

7 3 Terms and definitions .................................................................................................... 15

8 3.1 General terms ....................................................................................................... 15

9 3.2 Constructional units of assemblies ........................................................................ 17

10 3.3 External design of assemblies ............................................................................... 18

11 3.4 Structural parts of assemblies ............................................................................... 19

12 3.5 Conditions of installation of assemblies................................................................. 20

13 3.6 Insulation characteristics ...................................................................................... 21

14 3.7 Protection against electric shock ........................................................................... 23

15 3.8 Characteristics ...................................................................................................... 27

16 3.9 Verification............................................................................................................ 30

17 3.10 Manufacturer ........................................................................................................ 31

18 4 Symbols and abbreviations ............................................................................................ 31

19 5 Interface characteristics................................................................................................. 32

20 5.1 General ................................................................................................................. 32

21 5.2 Voltage ratings ...................................................................................................... 32

22 5.2.1 Rated voltage (U ) (of the assembly) ............................................................. 32

23 5.2.2 Rated operational voltage (U ) (of a circuit of an assembly) .......................... 32

24 5.2.3 Rated insulation voltage (U ) (of a circuit of an assembly) .............................. 33

25 5.2.4 Rated impulse withstand voltage (U ) (of the assembly) ............................ 33

imp

26 5.3 Current ratings ...................................................................................................... 33

27 5.3.1 Rated current of an assembly (I ) ............................................................... 33

28 5.3.2 Rated current of a main outgoing circuit (I ) ................................................ 33

29 5.3.3 Group rated current of a main circuit (I ) ....................................................... 33

30 5.3.4 Rated peak withstand current (I ) ................................................................ 34

31 5.3.5 Rated short-time withstand current (I ) (of a main circuit of an

32 assembly) ...................................................................................................... 34

33 5.3.6 Rated conditional short-circuit current (I ) (of an assembly or a circuit

34 of an assembly) ............................................................................................. 34

35 5.4 Rated diversity factor (RDF) .................................................................................. 34

36 5.5 Rated frequency (f ) ............................................................................................. 35

37 5.6 Other characteristics ............................................................................................. 35

38 6 Information .................................................................................................................... 35

39 6.1 Assembly designation marking .............................................................................. 35

40 6.2 Documentation ...................................................................................................... 36

41 6.2.1 Information relating to the assembly .............................................................. 36

42 6.2.2 Instructions for handling, installation, operation and maintenance .................. 36

43 6.3 Device and/or component identification ................................................................. 37

44 7 Service conditions ......................................................................................................... 37

45 7.1 Normal service conditions ..................................................................................... 37

46 7.1.1 Climatic conditions ........................................................................................ 37

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47 7.1.2 Pollution degree ............................................................................................ 37

48 7.2 Special service conditions ..................................................................................... 37

49 7.3 Conditions during transport, storage and installation ............................................. 38

50 8 Constructional requirements .......................................................................................... 38

51 8.1 Strength of materials and parts ............................................................................. 38

52 8.1.1 General ......................................................................................................... 38

53 8.1.2 Protection against corrosion .......................................................................... 39

54 8.1.3 Properties of insulating materials ................................................................... 39

55 8.1.4 Resistance to ultra-violet (UV) radiation ......................................................... 39

56 8.1.5 Mechanical strength....................................................................................... 39

57 8.1.6 Lifting provision ............................................................................................. 40

58 8.2 Degree of protection provided by an assembly enclosure ...................................... 40

59 8.2.1 Protection against mechanical impact ............................................................ 40

60 8.2.2 Protection against contact with live parts, ingress of solid foreign bodies

61 and water ...................................................................................................... 40

62 8.2.3 assembly with removable parts ...................................................................... 40

63 8.3 Clearances and creepage distances ...................................................................... 41

64 8.3.1 General ......................................................................................................... 41

65 8.3.2 Clearances .................................................................................................... 41

66 8.3.3 Creepage distances ....................................................................................... 41

67 8.3.4 AC conductors passing through ferromagnetic enclosures or plates ............... 42

68 8.4 Protection against electric shock ........................................................................... 42

69 8.4.1 General ......................................................................................................... 42

70 8.4.2 Basic protection ............................................................................................. 42

71 8.4.3 Fault protection ............................................................................................. 43

72 8.4.4 Additional requirements for class II assemblies.............................................. 45

73 8.4.5 Limitation of steady-state touch currents and charge ..................................... 46

74 8.4.6 Operating and servicing conditions ................................................................ 46

75 8.5 Incorporation of switching devices and components .............................................. 48

76 8.5.1 Fixed parts .................................................................................................... 48

77 8.5.2 Removable parts ........................................................................................... 48

78 8.5.3 Selection of switching devices and components ............................................. 48

79 8.5.4 Installation of switching devices and components .......................................... 49

80 8.5.5 Accessibility................................................................................................... 49

81 8.5.6 Barriers ......................................................................................................... 49

82 8.5.7 Direction of operation and indication of switching positions ............................ 49

83 8.5.8 Indicator lights and push-buttons ................................................................... 49

84 8.5.9 Power factor correction banks........................................................................ 49

85 8.6 Internal electrical circuits and connections ............................................................ 50

86 8.6.1 Main circuits .................................................................................................. 50

87 8.6.2 Auxiliary circuits ............................................................................................ 50

88 8.6.3 Bare and insulated conductors ....................................................................... 50

89 8.6.4 Selection and installation of non-protected live conductors to reduce the

90 possibility of short-circuits ............................................................................. 51

91 8.6.5 Identification of the conductors of main and auxiliary circuits ......................... 52

92 8.6.6 Identification of the protective conductor (PE, PEL, PEM, PEN) and of
93 the neutral conductor (N) and the mid-point conductor (M) of the main

94 circuits ........................................................................................................... 52

95 8.7 Cooling (natural and/or active) .............................................................................. 52

96 8.8 Terminals for external cables ................................................................................ 52

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97 9 Performance requirements............................................................................................. 53

98 9.1 Dielectric properties .............................................................................................. 53

99 9.1.1 General ......................................................................................................... 53

100 9.1.2 Power-frequency withstand voltage................................................................ 54

101 9.1.3 Impulse withstand voltage.............................................................................. 54

102 9.1.4 Protection of surge protective devices ........................................................... 54

103 9.2 Temperature-rise limits ......................................................................................... 54

104 9.2.1 General ......................................................................................................... 54

105 9.2.2 Adjustment of rated currents for alternative ambient air temperatures ............ 55

106 9.3 Short-circuit protection and short-circuit withstand strength .................................. 55

107 9.3.1 General ......................................................................................................... 55

108 9.3.2 Information concerning short-circuit withstand strength .................................. 55

109 9.3.3 Relationship between peak current and short-time current ............................. 56

110 9.3.4 Coordination of protective devices ................................................................. 56

111 9.4 Electromagnetic compatibility (EMC) ..................................................................... 56

112 10 Design verification ......................................................................................................... 56

113 10.1 General ................................................................................................................. 56

114 10.2 Strength of materials and parts ............................................................................. 58

115 10.2.1 General ......................................................................................................... 58

116 10.2.2 Resistance to corrosion ................................................................................. 58

117 10.2.3 Properties of insulating materials ................................................................... 59

118 10.2.4 Resistance to ultra-violet (UV) radiation ......................................................... 60

119 10.2.5 Lifting ............................................................................................................ 61

120 10.2.6 Verification of protection against mechanical impact ...................................... 61

121 10.2.7 Marking ......................................................................................................... 62

122 10.2.8 Mechanical operation ..................................................................................... 62

123 10.3 IP degree of protection of assemblies ................................................................... 62

124 10.4 Clearances and creepage distances ...................................................................... 63

125 10.5 Protection against electric shock and integrity of protective circuits ...................... 63

126 10.5.1 Effectiveness of the protective circuit ............................................................. 63

127 10.5.2 Effective earth continuity between the exposed-conductive-parts of the

128 class I assembly and the protective circuit ..................................................... 63

129 10.5.3 Short-circuit withstand strength of the protective circuit ................................. 64

130 10.6 Incorporation of switching devices and components .............................................. 64

131 10.6.1 General ......................................................................................................... 64

132 10.6.2 Electromagnetic compatibility ........................................................................ 64

133 10.7 Internal electrical circuits and connections ............................................................ 64

134 10.8 Terminals for external conductors ......................................................................... 64

135 10.9 Dielectric properties .............................................................................................. 65

136 10.9.1 General ......................................................................................................... 65

137 10.9.2 Power-frequency withstand voltage................................................................ 65

138 10.9.3 Impulse withstand voltage.............................................................................. 66

139 10.9.4 Testing of enclosures made of insulating material .......................................... 68

140 10.9.5 External door or cover mounted operating handles of insulating material ....... 68

141 10.9.6 Testing of conductors and hazardous live parts covered by insulating

142 material to provide protection against electric shock ...................................... 68

143 10.10 Temperature-rise .................................................................................................. 68

144 10.10.1 General ......................................................................................................... 68

145 10.10.2 Verification by testing .................................................................................... 68

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146 10.10.3 Verification by comparison ............................................................................. 74

147 10.10.4 Verification assessment ................................................................................. 77

148 10.11 Short-circuit withstand strength ............................................................................. 79

149 10.11.1 General ......................................................................................................... 79

150 10.11.2 Circuits of assemblies which are exempted from the verification of the

151 short-circuit withstand strength ...................................................................... 79

152 10.11.3 Verification by comparison with a reference design – Using a checklist ......... 79

153 10.11.4 Verification by comparison with a reference design(s) – Using

154 calculation ..................................................................................................... 80

155 10.11.5 Verification by test ......................................................................................... 80

156 10.12 Electromagnetic compatibility (EMC) ..................................................................... 85

157 11 11 Routine verification ................................................................................................... 85

158 11.1 General ................................................................................................................. 85

159 11.2 Degree of protection against contact with hazardous live parts, ingress of

160 solid foreign bodies and water of enclosures ......................................................... 86

161 11.3 Clearances and creepage distances ...................................................................... 86

162 11.4 Protection against electric shock and integrity of protective circuits ...................... 86

163 11.5 Incorporation of built-in components ..................................................................... 87

164 11.6 Internal electrical circuits and connections ............................................................ 87

165 11.7 Terminals for external conductors ......................................................................... 87

166 11.8 Mechanical operation ............................................................................................ 87

167 11.9 Dielectric properties .............................................................................................. 87

168 11.10 Wiring, operational performance and function ....................................................... 87

169 Annex A (normative) Minimum and maximum cross-section of copper cables suitable

170 for connection to terminals for external cabless (see 8.8) .............................................. 96

171 Annex B (normative) Method of calculating the cross-sectional area of protective

172 conductors with regard to thermal stresses due to currents of short duration ................. 97

173 Annex C (informative) User information template ................................................................. 98

174 Annex D (informative) Design verification .......................................................................... 102

175 Annex E (informative) Rated diversity factor ...................................................................... 103

176 E.1 General ............................................................................................................... 103

177 E.2 Rated diversity factor for outgoing circuits within an assembly ............................ 103

178 E.2.1 General ....................................................................................................... 103

179 Rating of the device I ......................................................................................................... 105

180 Example 1 Figure E.2 ......................................................................................................... 105

181 E.2.2 Example of an assembly with a RDF 0,68 .................................................... 106

182 E.2.3 Example of an assembly with RDF declared for each section ................................ 107

183 Annex F (normative) Measurement of clearances and creepage distances ........................ 108

184 F.1 Basic principles ................................................................................................... 108

185 F.2 Use of ribs .......................................................................................................... 108

186 Annex G (normative) Correlation between the nominal voltage of the supply system

187 and the rated impulse withstand voltage of the equipment ........................................... 113

188 Annex H (informative) Operating current and power loss of copper conductors .................. 115

189 Annex I (informative) Thermal equivalent of an intermittent current .................................... 118

190 I.1 Thermal equivalent of an intermittent duty ........................................................... 118

191 Annex J (normative) Electromagnetic compatibility (EMC)................................................. 119

192 J.1 General ............................................................................................................... 119

193 J.3 Terms and definitions .......................................................................................... 119

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194 J.9.4Performance requirements ...................................................................................... 120

195 J.9.4.1General ............................................................................................................... 120

196 J.9.4.2Requirement for testing........................................................................................ 120

197 J.9.4.3Immunity .............................................................................................................. 121

198 J.9.4.3.1Assemblies not incorporating electronic circuits ................................................ 121

199 J.9.4.3.2Assemblies incorporating electronic circuits ...................................................... 121

200 J.9.4.4Emission .............................................................................................................. 121

201 J.9.4.4.1Assemblies not incorporating electronic circuits ................................................ 121

202 J.9.4.4.2Assemblies incorporating electronic circuits ...................................................... 121

203 J.10.12Tests for EMC .................................................................................................. 121

204 J.10.12.2Immunity tests ................................................................................................. 122

205 J.10.12.2.1Assemblies not incorporating electronic circuits ............................................ 122

206 J.10.12.2.2Assemblies incorporating electronic circuits .................................................. 122

207 J.10.12.3 Emission tests ............................................................................................. 122

208 J.10.12.3.1 Assemblies not incorporating electronic circuits ........................ 122

209 J.10.12.3.2 Assemblies incorporating electronic circuits .............................. 122

210 Annex K Void ...................................................................................................................... 126

211 Annex L Void ...................................................................................................................... 127

212 Annex M Void ..................................................................................................................... 128

213 Annex N (normative) Operating current and power loss of bare copper bars ...................... 129

214 Annex O (informative) Guidance on verification of temperature-rise ................................... 132

215 O.1 General ............................................................................................................... 132

216 O.1.1 Principals .................................................................................................... 132

217 O.1.2 Current ratings of assemblies ...................................................................... 132

218 O.2 Temperature-rise limits ....................................................................................... 133

219 O.3 Test .................................................................................................................... 133

220 O.3.1 General ....................................................................................................... 133

221 O.3.2 Method a) – Verification of the complete assembly (10.10.2.3.5) ................. 134

222 O.3.3 Method b) – Verification considering individual functional units

223 separately and the complete assembly (10.10.2.3.6) ................................... 134

224 O.3.4 Method c) – Verification considering individual functional units and the

225 main and distribution busbars separately as well as the complete

226 assembly (10.10.2.3.7) ................................................................................ 134

227 O.4 Verification assessment ...................................................................................... 134

228 O.4.1 General ....................................................................................................... 134

229 O.4.2 Single compartment assembly with a rated current (I ) not exceeding
230 630 A ...............
...

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