FprEN IEC 61439-1:2020

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

Standards Content (sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 1. del: Splošna pravilaNiederspannungs-Schaltgerätekombinationen - Teil 1: Allgemeine FestlegungenEnsembles d'appareillage à basse tension - Partie 1: Règles généralesLow-voltage switchgear and controlgear assemblies - Part 1: General rules29.130.20Nizkonapetostne stikalne in krmilne napraveLow voltage switchgear and controlgearICS:Ta slovenski standard je istoveten z:prEN IEC 61439-1:2019oSIST prEN IEC 61439-1:2019en01-maj-2019oSIST prEN IEC 61439-1:2019SLOVENSKI

STANDARD
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 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.

NOT SUBMITTED FOR CENELEC PARALLEL VOTING

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.

oSIST prEN IEC 61439-1:2019
61439-1/Ed.3/CDV © IEC(E) 2 121B/80/CDV
CONTENTS 1

2 FOREWORD ........................................................................................................................... 9 3 INTRODUCTION ................................................................................................................... 11 4 1 Scope ............................................................................................................................ 12 5 2 Normative references .................................................................................................... 12 6 3 Terms and definitions .................................................................................................... 15 7 3.1 General terms ....................................................................................................... 15 8 3.2 Constructional units of assemblies ........................................................................ 17 9 3.3 External design of assemblies ............................................................................... 18 10 3.4 Structural parts of assemblies ............................................................................... 19 11 3.5 Conditions of installation of assemblies................................................................. 20 12 3.6 Insulation characteristics ...................................................................................... 21 13 3.7 Protection against electric shock ........................................................................... 23 14 3.8 Characteristics ...................................................................................................... 27 15 3.9 Verification............................................................................................................ 30 16 3.10 Manufacturer ........................................................................................................ 31 17 4 Symbols and abbreviations ............................................................................................ 31 18 5 Interface characteristics................................................................................................. 32 19 5.1 General ................................................................................................................. 32 20 5.2 Voltage ratings ...................................................................................................... 32 21 5.2.1 Rated voltage (Un) (of the assembly) ............................................................. 32 22 5.2.2 Rated operational voltage (Ue) (of a circuit of an assembly) .......................... 32 23 5.2.3 Rated insulation voltage (Ui) (of a circuit of an assembly) .............................. 33 24 5.2.4 Rated impulse withstand voltage (Uimp) (of the assembly) ............................ 33 25 5.3 Current ratings ...................................................................................................... 33 26 5.3.1 Rated current of an assembly (InA) ............................................................... 33 27 5.3.2 Rated current of a main outgoing circuit (Inc) ................................................ 33 28 5.3.3 Group rated current of a main circuit (Ing) ....................................................... 33 29 5.3.4 Rated peak withstand current (Ipk) ................................................................ 34 30 5.3.5 Rated short-time withstand current (Icw) (of a main circuit of an 31 assembly) ...................................................................................................... 34 32 5.3.6 Rated conditional short-circuit current (Icc) (of an assembly or a circuit 33 of an assembly) ............................................................................................. 34 34 5.4 Rated diversity factor (RDF) .................................................................................. 34 35 5.5 Rated frequency (fn) ............................................................................................. 35 36 5.6 Other characteristics ............................................................................................. 35 37 6 Information .................................................................................................................... 35 38 6.1 Assembly designation marking .............................................................................. 35 39 6.2 Documentation ...................................................................................................... 36 40 6.2.1 Information relating to the assembly .............................................................. 36 41 6.2.2 Instructions for handling, installation, operation and maintenance .................. 36 42 6.3 Device and/or component identification ................................................................. 37 43 7 Service conditions ......................................................................................................... 37 44 7.1 Normal service conditions ..................................................................................... 37 45 7.1.1 Climatic conditions ........................................................................................ 37 46 oSIST prEN IEC 61439-1:2019

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7.1.2 Pollution degree ............................................................................................ 37 47 7.2 Special service conditions ..................................................................................... 37 48 7.3 Conditions during transport, storage and installation ............................................. 38 49 8 Constructional requirements .......................................................................................... 38 50 8.1 Strength of materials and parts ............................................................................. 38 51 8.1.1 General ......................................................................................................... 38 52 8.1.2 Protection against corrosion .......................................................................... 39 53 8.1.3 Properties of insulating materials ................................................................... 39 54 8.1.4 Resistance to ultra-violet (UV) radiation ......................................................... 39 55 8.1.5 Mechanical strength....................................................................................... 39 56 8.1.6 Lifting provision ............................................................................................. 40 57 8.2 Degree of protection provided by an assembly enclosure ...................................... 40 58 8.2.1 Protection against mechanical impact ............................................................ 40 59 8.2.2 Protection against contact with live parts, ingress of solid foreign bodies 60 and water ...................................................................................................... 40 61 8.2.3 assembly with removable parts ...................................................................... 40 62 8.3 Clearances and creepage distances ...................................................................... 41 63 8.3.1 General ......................................................................................................... 41 64 8.3.2 Clearances .................................................................................................... 41 65 8.3.3 Creepage distances ....................................................................................... 41 66 8.3.4 AC conductors passing through ferromagnetic enclosures or plates ............... 42 67 8.4 Protection against electric shock ........................................................................... 42 68 8.4.1 General ......................................................................................................... 42 69 8.4.2 Basic protection ............................................................................................. 42 70 8.4.3 Fault protection ............................................................................................. 43 71 8.4.4 Additional requirements for class II assemblies.............................................. 45 72 8.4.5 Limitation of steady-state touch currents and charge ..................................... 46 73 8.4.6 Operating and servicing conditions ................................................................ 46 74 8.5 Incorporation of switching devices and components .............................................. 48 75 8.5.1 Fixed parts .................................................................................................... 48 76 8.5.2 Removable parts ........................................................................................... 48 77 8.5.3 Selection of switching devices and components ............................................. 48 78 8.5.4 Installation of switching devices and components .......................................... 49 79 8.5.5 Accessibility................................................................................................... 49 80 8.5.6 Barriers ......................................................................................................... 49 81 8.5.7 Direction of operation and indication of switching positions ............................ 49 82 8.5.8 Indicator lights and push-buttons ................................................................... 49 83 8.5.9 Power factor correction banks........................................................................ 49 84 8.6 Internal electrical circuits and connections ............................................................ 50 85 8.6.1 Main circuits .................................................................................................. 50 86 8.6.2 Auxiliary circuits ............................................................................................ 50 87 8.6.3 Bare and insulated conductors ....................................................................... 50 88 8.6.4 Selection and installation of non-protected live conductors to reduce the 89 possibility of short-circuits ............................................................................. 51 90 8.6.5 Identification of the conductors of main and auxiliary circuits ......................... 52 91 8.6.6 Identification of the protective conductor (PE, PEL, PEM, PEN) and of 92 the neutral conductor (N) and the mid-point conductor (M) of the main 93 circuits ........................................................................................................... 52 94 8.7 Cooling (natural and/or active) .............................................................................. 52 95 8.8 Terminals for external cables ................................................................................ 52 96 oSIST prEN IEC 61439-1:2019

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9 Performance requirements............................................................................................. 53 97 9.1 Dielectric properties .............................................................................................. 53 98 9.1.1 General ......................................................................................................... 53 99 9.1.2 Power-frequency withstand voltage................................................................ 54 100 9.1.3 Impulse withstand voltage.............................................................................. 54 101 9.1.4 Protection of surge protective devices ........................................................... 54 102 9.2 Temperature-rise limits ......................................................................................... 54 103 9.2.1 General ......................................................................................................... 54 104 9.2.2 Adjustment of rated currents for alternative ambient air temperatures ............ 55 105 9.3 Short-circuit protection and short-circuit withstand strength .................................. 55 106 9.3.1 General ......................................................................................................... 55 107 9.3.2 Information concerning short-circuit withstand strength .................................. 55 108 9.3.3 Relationship between peak current and short-time current ............................. 56 109 9.3.4 Coordination of protective devices ................................................................. 56 110 9.4 Electromagnetic compatibility (EMC) ..................................................................... 56 111 10 Design verification ......................................................................................................... 56 112 10.1 General ................................................................................................................. 56 113 10.2 Strength of materials and parts ............................................................................. 58 114 10.2.1 General ......................................................................................................... 58 115 10.2.2 Resistance to corrosion ................................................................................. 58 116 10.2.3 Properties of insulating materials ................................................................... 59 117 10.2.4 Resistance to ultra-violet (UV) radiation ......................................................... 60 118 10.2.5 Lifting ............................................................................................................ 61 119 10.2.6 Verification of protection against mechanical impact ...................................... 61 120 10.2.7 Marking ......................................................................................................... 62 121 10.2.8 Mechanical operation ..................................................................................... 62 122 10.3 IP degree of protection of assemblies ................................................................... 62 123 10.4 Clearances and creepage distances ...................................................................... 63 124 10.5 Protection against electric shock and integrity of protective circuits ...................... 63 125 10.5.1 Effectiveness of the protective circuit ............................................................. 63 126 10.5.2 Effective earth continuity between the exposed-conductive-parts of the 127 class I assembly and the protective circuit ..................................................... 63 128 10.5.3 Short-circuit withstand strength of the protective circuit ................................. 64 129 10.6 Incorporation of switching devices and components .............................................. 64 130 10.6.1 General ......................................................................................................... 64 131 10.6.2 Electromagnetic compatibility ........................................................................ 64 132 10.7 Internal electrical circuits and connections ............................................................ 64 133 10.8 Terminals for external conductors ......................................................................... 64 134 10.9 Dielectric properties .............................................................................................. 65 135 10.9.1 General ......................................................................................................... 65 136 10.9.2 Power-frequency withstand voltage................................................................ 65 137 10.9.3 Impulse withstand voltage.............................................................................. 66 138 10.9.4 Testing of enclosures made of insulating material .......................................... 68 139 10.9.5 External door or cover mounted operating handles of insulating material ....... 68 140 10.9.6 Testing of conductors and hazardous live parts covered by insulating 141 material to provide protection against electric shock ...................................... 68 142 10.10 Temperature-rise .................................................................................................. 68 143 10.10.1 General ......................................................................................................... 68 144 10.10.2 Verification by testing .................................................................................... 68 145 oSIST prEN IEC 61439-1:2019

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10.10.3 Verification by comparison ............................................................................. 74 146 10.10.4 Verification assessment ................................................................................. 77 147 10.11 Short-circuit withstand strength ............................................................................. 79 148 10.11.1 General ......................................................................................................... 79 149 10.11.2 Circuits of assemblies which are exempted from the verification of the 150 short-circuit withstand strength ...................................................................... 79 151 10.11.3 Verification by comparison with a reference design – Using a checklist ......... 79 152 10.11.4 Verification by comparison with a reference design(s) – Using 153 calculation ..................................................................................................... 80 154 10.11.5 Verification by test ......................................................................................... 80 155 10.12 Electromagnetic compatibility (EMC) ..................................................................... 85 156 11 11 Routine verification ................................................................................................... 85 157 11.1 General ................................................................................................................. 85 158 11.2 Degree of protection against contact with hazardous live parts, ingress of 159 solid foreign bodies and water of enclosures ......................................................... 86 160 11.3 Clearances and creepage distances ...................................................................... 86 161 11.4 Protection against electric shock and integrity of protective circuits ...................... 86 162 11.5 Incorporation of built-in components ..................................................................... 87 163 11.6 Internal electrical circuits and connections ............................................................ 87 164 11.7 Terminals for external conductors ......................................................................... 87 165 11.8 Mechanical operation ............................................................................................ 87 166 11.9 Dielectric properties .............................................................................................. 87 167 11.10 Wiring, operational performance and function ....................................................... 87 168 Annex A (normative)

Minimum and maximum cross-section of copper cables suitable 169 for connection to terminals for external cabless (see 8.8) .............................................. 96 170 Annex B (normative)

Method of calculating the cross-sectional area of protective 171 conductors with regard to thermal stresses due to currents of short duration ................. 97 172 Annex C (informative)

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

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

Rated diversity factor ...................................................................... 103 175 E.1 General ............................................................................................................... 103 176 E.2 Rated diversity factor for outgoing circuits within an assembly ............................ 103 177 E.2.1 General ....................................................................................................... 103 178 Rating of the device In ......................................................................................................... 105 179 Example 1 Figure E.2 ......................................................................................................... 105 180 E.2.2 Example of an assembly with a RDF 0,68 .................................................... 106 181 E.2.3 Example of an assembly with RDF declared for each section ................................ 107 182 Annex F (normative)

Measurement of clearances and creepage distances

........................ 108 183 F.1 Basic principles ................................................................................................... 108 184 F.2 Use of ribs .......................................................................................................... 108 185 Annex G (normative)

Correlation between the nominal voltage of the supply system 186 and the rated impulse withstand voltage of the equipment ........................................... 113 187 Annex H (informative)

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

Thermal equivalent of an intermittent current .................................... 118 189 I.1 Thermal equivalent of an intermittent duty ........................................................... 118 190 Annex J (normative)

Electromagnetic compatibility (EMC)................................................. 119 191 J.1 General ............................................................................................................... 119 192 J.3 Terms and definitions .......................................................................................... 119 193 oSIST prEN IEC 61439-1:2019

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J.9.4Performance requirements ...................................................................................... 120 194 J.9.4.1General ............................................................................................................... 120 195 J.9.4.2Requirement for testing........................................................................................ 120 196 J.9.4.3Immunity .............................................................................................................. 121 197 J.9.4.3.1Assemblies not incorporating electronic circuits ................................................ 121 198 J.9.4.3.2Assemblies incorporating electronic circuits ...................................................... 121 199 J.9.4.4Emission .............................................................................................................. 121 200 J.9.4.4.1Assemblies not incorporating electronic circuits ................................................ 121 201 J.9.4.4.2Assemblies incorporating electronic circuits ...................................................... 121 202 J.10.12Tests for EMC .................................................................................................. 121 203 J.10.12.2Immunity tests ................................................................................................. 122 204 J.10.12.2.1Assemblies not incorporating electronic circuits ............................................ 122 205 J.10.12.2.2Assemblies incorporating electronic circuits .................................................. 122 206 J.10.12.3 Emission tests ............................................................................................. 122 207 J.10.12.3.1 Assemblies not incorporating electronic circuits ........................ 122 208 J.10.12.3.2 Assemblies incorporating electronic circuits .............................. 122 209 Annex K Void ...................................................................................................................... 126 210 Annex L Void ...................................................................................................................... 127 211 Annex M Void ..................................................................................................................... 128 212 Annex N (normative)

Operating current and power loss of bare copper bars ...................... 129 213 Annex O (informative)

Guidance on verification of temperature-rise ................................... 132 214 O.1 General ............................................................................................................... 132 215 O.1.1 Principals .................................................................................................... 132 216 O.1.2 Current ratings of assemblies ...................................................................... 132 217 O.2 Temperature-rise limits ....................................................................................... 133 218 O.3 Test .................................................................................................................... 133 219 O.3.1 General ....................................................................................................... 133 220 O.3.2 Method a) – Verification of the complete assembly (10.10.2.3.5) ................. 134 221 O.3.3 Method b) – Verification considering individual functional units 222 separately and the complete assembly (10.10.2.3.6) ................................... 134 223 O.3.4 Method c) – Verification considering individual functional units and the 224 main and distribution busbars separately as well as the complete 225 assembly (10.10.2.3.7) ................................................................................ 134 226 O.4 Verification assessment ...................................................................................... 134 227 O.4.1 General ....................................................................................................... 134 228 O.4.2 Single compartment assembly with a rated current (InA) not exceeding 229 630 A ........................................................................................................... 134 230 O.4.3 Assembly with rated currents (InAc not exceeding kbØpMM A ............................. 135 231 O.5 Verification by comparison with a tested reference design .................................. 135 232 Annex P (normative)

Verification of the short-circuit withstand strength of busbar 233 structures by comparison with a tested reference design by calculation ....................... 137 234 P.1 General ............................................................................................................... 137 235 P.2 Terms and definitions .......................................................................................... 137 236 P.3 Method of verificati

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