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.

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.

General Information

Status
Published
Publication Date
04-May-2020
Current Stage
PPUB - Publication issued
Completion Date
05-May-2020
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IEC 61439-1
Edition 3.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
Ensembles d’appareillage à basse tension –
Partie 1: Règles générales
IEC 61439-1:2020-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61439-1
Edition 3.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
Ensembles d’appareillage à basse tension –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-8154-3

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61439-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 8

INTRODUCTION ................................................................................................................... 10

1 Scope ............................................................................................................................ 11

2 Normative references .................................................................................................... 11

3 Terms and definitions .................................................................................................... 14

3.1 General terms ....................................................................................................... 14

3.2 Constructional units of assemblies ........................................................................ 16

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

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

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

3.6 Insulation characteristics ...................................................................................... 20

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

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

3.9 Verification ........................................................................................................... 31

3.10 Manufacturer ........................................................................................................ 32

3.11 User ...................................................................................................................... 32

4 Symbols and abbreviations ............................................................................................ 32

5 Interface characteristics ................................................................................................ 33

5.1 General ................................................................................................................. 33

5.2 Voltage ratings ...................................................................................................... 33

5.2.1 Rated voltage (U ) (of the assembly) ............................................................. 33

5.2.2 Rated operational voltage (U ) (of a circuit of an assembly)........................... 34

5.2.3 Rated insulation voltage (U ) (of a circuit of an assembly) .............................. 34

5.2.4 Rated impulse withstand voltage (U ) (of the assembly) ............................. 34

imp

5.3 Current ratings ...................................................................................................... 34

5.3.1 Rated current of an assembly (I ) ................................................................ 34

5.3.2 Rated current of a main outgoing circuit (I ) ................................................. 34

5.3.3 Group rated current of a main circuit (I ) ...................................................... 35

5.3.4 Rated peak withstand current (I ) ................................................................. 35

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

assembly) ...................................................................................................... 36

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

of an assembly) ............................................................................................. 36

5.4 Rated diversity factor (RDF) .................................................................................. 36

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

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

6 Information .................................................................................................................... 37

6.1 Assembly designation marking .............................................................................. 37

6.2 Documentation ...................................................................................................... 37

6.2.1 Information relating to the assembly .............................................................. 37

6.2.2 Instructions for handling, installation, operation and maintenance .................. 38

6.3 Device and/or component identification ................................................................. 38

7 Service conditions ......................................................................................................... 38

7.1 Normal service conditions ..................................................................................... 38

7.1.1 Climatic conditions ........................................................................................ 38

7.1.2 Pollution degree ............................................................................................ 39

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IEC 61439-1:2020 © IEC 2020 – 3 –

7.2 Special service conditions ..................................................................................... 39

7.3 Conditions during transport, storage and installation ............................................. 40

8 Constructional requirements .......................................................................................... 40

8.1 Strength of materials and parts ............................................................................. 40

8.1.1 General ......................................................................................................... 40

8.1.2 Protection against corrosion .......................................................................... 41

8.1.3 Properties of insulating materials ................................................................... 41

8.1.4 Resistance to ultra-violet (UV) radiation ......................................................... 41

8.1.5 Mechanical strength ...................................................................................... 41

8.1.6 Lifting provision ............................................................................................. 42

8.2 Degree of protection provided by an assembly enclosure ...................................... 42

8.2.1 Protection against mechanical impact (IK code) ............................................. 42

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

and water (IP code) ....................................................................................... 42

8.2.3 Assembly with removable parts...................................................................... 43

8.3 Clearances and creepage distances...................................................................... 43

8.3.1 General ......................................................................................................... 43

8.3.2 Clearances .................................................................................................... 43

8.3.3 Creepage distances ....................................................................................... 44

8.4 Protection against electric shock ........................................................................... 44

8.4.1 General ......................................................................................................... 44

8.4.2 Basic protection ............................................................................................. 44

8.4.3 Fault protection ............................................................................................. 45

8.4.4 Additional requirements for class II assemblies ............................................. 48

8.4.5 Limitation of steady-state touch currents and charge ..................................... 49

8.4.6 Operating and servicing conditions ................................................................ 49

8.5 Incorporation of switching devices and components .............................................. 50

8.5.1 Fixed parts .................................................................................................... 50

8.5.2 Removable parts ........................................................................................... 51

8.5.3 Selection of switching devices and components ............................................. 51

8.5.4 Installation of switching devices and components .......................................... 51

8.5.5 Accessibility .................................................................................................. 52

8.5.6 Barriers ......................................................................................................... 52

8.5.7 Direction of operation and indication of switching positions ............................ 52

8.5.8 Indicator lights and push-buttons ................................................................... 52

8.5.9 Power factor correction banks ....................................................................... 52

8.6 Internal electrical circuits and connections ............................................................ 52

8.6.1 Main circuits .................................................................................................. 52

8.6.2 Auxiliary circuits ............................................................................................ 53

8.6.3 Bare and insulated conductors ....................................................................... 53

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

possibility of short-circuits ............................................................................. 55

8.6.5 Identification of the conductors of main and auxiliary circuits ......................... 55

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

circuits ........................................................................................................... 55

8.6.7 Conductors in AC circuits passing through ferromagnetic enclosures or

plates ............................................................................................................ 55

8.7 Cooling ................................................................................................................. 55

8.8 Terminals for external cables ................................................................................ 55

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– 4 – IEC 61439-1:2020 © IEC 2020

9 Performance requirements ............................................................................................ 57

9.1 Dielectric properties .............................................................................................. 57

9.1.1 General ......................................................................................................... 57

9.1.2 Power-frequency withstand voltage ............................................................... 57

9.1.3 Impulse withstand voltage ............................................................................. 57

9.1.4 Protection of surge protective devices ........................................................... 58

9.2 Temperature-rise limits ......................................................................................... 58

9.2.1 General ......................................................................................................... 58

9.2.2 Adjustment of rated currents for alternative ambient air temperatures ............ 58

9.3 Short-circuit protection and short-circuit withstand strength .................................. 59

9.3.1 General ......................................................................................................... 59

9.3.2 Information concerning short-circuit withstand strength .................................. 59

9.3.3 Relationship between peak current and short-time current ............................. 60

9.3.4 Coordination of protective devices ................................................................. 60

9.4 Electromagnetic compatibility (EMC) ..................................................................... 60

10 Design verification ......................................................................................................... 60

10.1 General ................................................................................................................. 60

10.2 Strength of materials and parts ............................................................................. 62

10.2.1 General ......................................................................................................... 62

10.2.2 Resistance to corrosion ................................................................................. 62

10.2.3 Properties of insulating materials ................................................................... 64

10.2.4 Resistance to ultraviolet (UV) radiation .......................................................... 65

10.2.5 Lifting ............................................................................................................ 66

10.2.6 Verification of protection against mechanical impact (IK code) ....................... 67

10.2.7 Marking ......................................................................................................... 67

10.2.8 Mechanical operation ..................................................................................... 67

10.3 Degree of protection of assemblies (IP Code) ....................................................... 68

10.4 Clearances and creepage distances...................................................................... 69

10.5 Protection against electric shock and integrity of protective circuits ...................... 69

10.5.1 General ......................................................................................................... 69

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

class I assembly and the protective circuit ..................................................... 69

10.5.3 Short-circuit withstand strength of the protective circuit ................................. 69

10.6 Incorporation of switching devices and components .............................................. 70

10.6.1 General ......................................................................................................... 70

10.6.2 Electromagnetic compatibility ........................................................................ 70

10.7 Internal electrical circuits and connections ............................................................ 70

10.8 Terminals for external conductors ......................................................................... 70

10.9 Dielectric properties .............................................................................................. 71

10.9.1 General ......................................................................................................... 71

10.9.2 Power-frequency withstand voltage ............................................................... 71

10.9.3 Impulse withstand voltage ............................................................................. 72

10.9.4 Testing of enclosures made of insulating material .......................................... 74

10.9.5 External door or cover mounted operating handles of insulating material ....... 74

10.9.6 Testing of conductors and hazardous live parts covered by insulating

material to provide protection against electric shock ...................................... 74

10.10 Temperature-rise .................................................................................................. 74

10.10.1 General ......................................................................................................... 74

10.10.2 Verification by testing .................................................................................... 75

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IEC 61439-1:2020 © IEC 2020 – 5 –

10.10.3 Verification by comparison ............................................................................. 81

10.10.4 Verification assessment ................................................................................. 84

10.11 Short-circuit withstand strength ............................................................................. 86

10.11.1 General ......................................................................................................... 86

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

short-circuit withstand strength ...................................................................... 86

10.11.3 Verification by comparison with a reference design – Using a checklist ......... 87

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

calculation ..................................................................................................... 87

10.11.5 Verification by test ......................................................................................... 87

10.12 Electromagnetic compatibility (EMC) ..................................................................... 93

11 Routine verification ........................................................................................................ 93

11.1 General ................................................................................................................. 93

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

solid foreign bodies and water of enclosures ......................................................... 94

11.3 Clearances and creepage distances...................................................................... 94

11.4 Protection against electric shock and integrity of protective circuits ...................... 94

11.5 Incorporation of built-in components ..................................................................... 95

11.6 Internal electrical circuits and connections ............................................................ 95

11.7 Terminals for external conductors ......................................................................... 95

11.8 Mechanical operation ............................................................................................ 95

11.9 Dielectric properties .............................................................................................. 95

11.10 Wiring, operational performance and function ....................................................... 95

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

for connection to terminals for external cables (see 8.8) ..................................................... 105

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

conductors with regard to thermal stresses due to currents of short duration ...................... 106

Annex C (informative) User information template ............................................................... 107

Annex D (informative) Design verification .......................................................................... 111

Annex E (informative) Rated diversity factor ...................................................................... 112

E.1 General ............................................................................................................... 112

E.2 Rated diversity factor for outgoing circuits within an assembly ............................ 112

E.2.1 General ....................................................................................................... 112

E.2.2 Example of an assembly with an RDF of 0,68 .............................................. 115

E.2.3 Example of an assembly with RDF declared for each section ....................... 116

Annex F (normative) Measurement of clearances and creepage distances ...................... 117

F.1 Basic principles ................................................................................................... 117

F.2 Use of ribs .......................................................................................................... 117

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

and the rated impulse withstand voltage of the equipment ............................................... 122

Annex H (informative) Operating current and power loss of copper cables ......................... 124

Annex I (informative) Thermal equivalent of an intermittent current .................................... 126

Annex J (normative) Electromagnetic compatibility (EMC).................................................. 127

J.1 General ............................................................................................................... 127

Annex K (normative) Operating current and power loss of bare copper bars ...................... 134

Annex L (informative) Guidance on verification of temperature-rise .................................... 137

L.1 General ............................................................................................................... 137

L.1.1 Principles .................................................................................................... 137

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– 6 – IEC 61439-1:2020 © IEC 2020

L.1.2 Current ratings of assemblies ...................................................................... 137

L.2 Temperature-rise limits ....................................................................................... 138

L.3 Test .................................................................................................................... 139

L.3.1 General ....................................................................................................... 139

L.3.2 Method a) – Verification of the complete assembly (10.10.2.3.5) ................. 139

L.3.3 Method b) – Verification considering individual functional units

separately and the complete assembly (10.10.2.3.6) ................................... 139

L.3.4 Method c) – Verification considering individual functional units and the
main and distribution busbars separately as well as the complete

assembly (10.10.2.3.7) ................................................................................ 140

L.4 Verification assessment ...................................................................................... 140

L.4.1 General ....................................................................................................... 140

L.4.2 Single compartment assembly with a rated current (I ) not exceeding

630 A ........................................................................................................... 140

L.4.3 Assembly with rated currents (I ) not exceeding 1 600 A ........................... 140

L.5 Verification by comparison with a reference design ...............................

...

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