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IEC 61439-1
Edition 3.0 2020-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
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IEC 61439-1
Edition 3.0 2020-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-8337-0
– 2 – IEC 61439-1:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 15
3.1 General terms . 16
3.2 Constructional units of assemblies . 18
3.3 External design of assemblies . 19
3.4 Structural parts of assemblies . 20
3.5 Conditions of installation of assemblies . 21
3.6 Insulation characteristics . 22
3.7 Protection against electric shock . 25
3.8 Characteristics . 29
3.9 Verification . 33
3.10 Manufacturer . 34
4 Symbols and abbreviations . 34
5 Interface characteristics . 35
5.1 General . 35
5.2 Voltage ratings . 35
5.2.1 Rated voltage (U ) (of the assembly) . 35
n
5.2.2 Rated operational voltage (U ) (of a circuit of an assembly) . 35
e
5.2.3 Rated insulation voltage (U ) (of a circuit of an assembly) . 36
i
5.2.4 Rated impulse withstand voltage (U ) (of the assembly) . 36
imp
5.3 Current ratings . 36
5.3.1 Rated current of an assembly (I ) . 36
nA
5.3.2 Rated current of a main outgoing circuit (I ) . 37
nc
5.3.3 Group rated current of a main circuit (I ) . 37
ng
5.3.4 Rated peak withstand current (I ) . 38
pk
5.3.5 Rated short-time withstand current (I ) (of a main circuit of an
cw
assembly) . 38
5.3.6 Rated conditional short-circuit current (I ) (of an assembly or a circuit
cc
of an assembly) . 38
5.4 Rated diversity factor (RDF) . 38
5.5 Rated frequency (f ) . 39
n
5.6 Other characteristics . 39
6 Information . 40
6.1 Assembly designation marking . 40
6.2 Documentation . 40
6.2.1 Information relating to the assembly . 40
6.2.2 Instructions for handling, installation, operation and maintenance . 40
6.3 Device and/or component identification . 41
7 Service conditions . 41
7.1 Normal service conditions . 41
7.1.1 Climatic conditions . 41
Ambient air temperature .
Humidity conditions .
7.1.2 Pollution degree . 42
Altitude .
7.2 Special service conditions . 43
7.3 Conditions during transport, storage and installation . 43
8 Constructional requirements . 43
8.1 Strength of materials and parts . 43
8.1.1 General . 43
8.1.2 Protection against corrosion . 44
8.1.3 Properties of insulating materials . 44
8.1.4 Resistance to ultra-violet (UV) radiation . 45
8.1.5 Mechanical strength . 45
8.1.6 Lifting provision . 45
8.2 Degree of protection provided by an assembly enclosure . 45
8.2.1 Protection against mechanical impact (IK code) . 45
8.2.2 Protection against contact with live parts, ingress of solid foreign bodies
and water (IP code) . 46
8.2.3 Assembly with removable parts. 46
8.3 Clearances and creepage distances. 47
8.3.1 General . 47
8.3.2 Clearances . 47
8.3.3 Creepage distances . 48
8.4 Protection against electric shock . 48
8.4.1 General . 48
8.4.2 Basic protection . 48
8.4.3 Fault protection . 49
8.4.4 Protection by total insulation Additional requirements for class II
assemblies . 52
8.4.5 Limitation of steady-state touch currents and charge . 54
8.4.6 Operating and servicing conditions . 54
8.5 Incorporation of switching devices and components . 56
8.5.1 Fixed parts . 56
8.5.2 Removable parts . 56
8.5.3 Selection of switching devices and components . 56
8.5.4 Installation of switching devices and components . 57
8.5.5 Accessibility . 57
8.5.6 Barriers . 58
8.5.7 Direction of operation and indication of switching positions . 58
8.5.8 Indicator lights and push-buttons . 58
8.5.9 Power factor correction banks . 58
8.6 Internal electrical circuits and connections . 58
8.6.1 Main circuits . 58
8.6.2 Auxiliary circuits . 59
8.6.3 Bare and insulated conductors . 59
8.6.4 Selection and installation of non-protected live conductors to reduce the
possibility of short-circuits . 60
8.6.5 Identification of the conductors of main and auxiliary circuits . 60
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 . 60
– 4 – IEC 61439-1:2020 RLV © IEC 2020
8.6.7 Conductors in AC circuits passing through ferromagnetic enclosures or
plates . 61
8.7 Cooling . 61
8.8 Terminals for external conductors cables . 61
9 Performance requirements .
...