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BS EN IEC 61439-1:2021:2022 Edition

BS EN IEC 61439-1:2021:2022 Edition

$215.11

Low-voltage switchgear and controlgear assemblies – General rules

Published By Publication Date Number of Pages
BSI 2022 170
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PDF Pages PDF Title
2 undefined
8 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
12 Annex ZZ (informative)Relationship between this European standard and the safety objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be covered
15 English
CONTENTS
21 FOREWORD
23 INTRODUCTION
24 1 Scope
2 Normative references
27 3 Terms and definitions
3.1 General terms
29 3.2 Constructional units of assemblies
31 3.3 External design of assemblies
32 3.4 Structural parts of assemblies
33 3.5 Conditions of installation of assemblies
3.6 Insulation characteristics
36 3.7 Protection against electric shock
40 3.8 Characteristics
44 3.9 Verification
45 3.10 Manufacturer
4 Symbols and abbreviations
46 5 Interface characteristics
5.1 General
5.2 Voltage ratings
5.2.1 Rated voltage (Un) (of the assembly)
47 5.2.2 Rated operational voltage (Ue) (of a circuit of an assembly)
5.2.3 Rated insulation voltage (Ui) (of a circuit of an assembly)
5.2.4 Rated impulse withstand voltage (Uimp) (of the assembly)
5.3 Current ratings
5.3.1 Rated current of an assembly (InA)
5.3.2 Rated current of a main outgoing circuit (Inc)
48 5.3.3 Group rated current of a main circuit (Ing)
5.3.4 Rated peak withstand current (Ipk)
49 5.3.5 Rated short-time withstand current (Icw) (of a main circuit of an assembly)
5.3.6 Rated conditional short-circuit current (Icc) (of an assembly or a circuit of an assembly)
5.4 Rated diversity factor (RDF)
5.5 Rated frequency (fn)
50 5.6 Other characteristics
6 Information
6.1 Assembly designation marking
6.2 Documentation
6.2.1 Information relating to the assembly
51 6.2.2 Instructions for handling, installation, operation and maintenance
6.3 Device and/or component identification
7 Service conditions
7.1 Normal service conditions
7.1.1 Climatic conditions
52 7.1.2 Pollution degree
7.2 Special service conditions
53 7.3 Conditions during transport, storage and installation
8 Constructional requirements
8.1 Strength of materials and parts
8.1.1 General
54 8.1.2 Protection against corrosion
8.1.3 Properties of insulating materials
8.1.4 Resistance to ultra-violet (UV) radiation
8.1.5 Mechanical strength
55 8.1.6 Lifting provision
8.2 Degree of protection provided by an assembly enclosure
8.2.1 Protection against mechanical impact (IK code)
8.2.2 Protection against contact with live parts, ingress of solid foreign bodies and water (IP code)
56 8.2.3 Assembly with removable parts
8.3 Clearances and creepage distances
8.3.1 General
8.3.2 Clearances
57 8.3.3 Creepage distances
8.4 Protection against electric shock
8.4.1 General
8.4.2 Basic protection
58 8.4.3 Fault protection
61 8.4.4 Additional requirements for class II assemblies
62 8.4.5 Limitation of steady-state touch currents and charge
8.4.6 Operating and servicing conditions
63 8.5 Incorporation of switching devices and components
8.5.1 Fixed parts
64 8.5.2 Removable parts
8.5.3 Selection of switching devices and components
8.5.4 Installation of switching devices and components
65 8.5.5 Accessibility
8.5.6 Barriers
8.5.7 Direction of operation and indication of switching positions
8.5.8 Indicator lights and push-buttons
8.5.9 Power factor correction banks
8.6 Internal electrical circuits and connections
8.6.1 Main circuits
66 8.6.2 Auxiliary circuits
8.6.3 Bare and insulated conductors
68 8.6.4 Selection and installation of non-protected live conductors to reduce the possibility of short-circuits
8.6.5 Identification of the conductors of main and auxiliary circuits
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
8.6.7 Conductors in AC circuits passing through ferromagnetic enclosures or plates
8.7 Cooling
8.8 Terminals for external cables
70 9 Performance requirements
9.1 Dielectric properties
9.1.1 General
9.1.2 Power-frequency withstand voltage
9.1.3 Impulse withstand voltage
71 9.1.4 Protection of surge protective devices
9.2 Temperature-rise limits
9.2.1 General
9.2.2 Adjustment of rated currents for alternative ambient air temperatures
72 9.3 Short-circuit protection and short-circuit withstand strength
9.3.1 General
9.3.2 Information concerning short-circuit withstand strength
73 9.3.3 Relationship between peak current and short-time current
9.3.4 Coordination of protective devices
9.4 Electromagnetic compatibility (EMC)
10 Design verification
10.1 General
75 10.2 Strength of materials and parts
10.2.1 General
10.2.2 Resistance to corrosion
77 10.2.3 Properties of insulating materials
78 10.2.4 Resistance to ultraviolet (UV) radiation
79 10.2.5 Lifting
80 10.2.6 Verification of protection against mechanical impact (IK code)
10.2.7 Marking
10.2.8 Mechanical operation
81 10.3 Degree of protection of assemblies (IP Code)
82 10.4 Clearances and creepage distances
10.5 Protection against electric shock and integrity of protective circuits
10.5.1 General
10.5.2 Effective earth continuity between the exposed-conductive-parts of the class I assembly and the protective circuit
10.5.3 Short-circuit withstand strength of the protective circuit
83 10.6 Incorporation of switching devices and components
10.6.1 General
10.6.2 Electromagnetic compatibility
10.7 Internal electrical circuits and connections
10.8 Terminals for external conductors
84 10.9 Dielectric properties
10.9.1 General
10.9.2 Power-frequency withstand voltage
85 10.9.3 Impulse withstand voltage
87 10.9.4 Testing of enclosures made of insulating material
10.9.5 External door or cover mounted operating handles of insulating material
10.9.6 Testing of conductors and hazardous live parts covered by insulating material to provide protection against electric shock
10.10 Temperature-rise
10.10.1 General
88 10.10.2 Verification by testing
94 10.10.3 Verification by comparison
97 10.10.4 Verification assessment
99 10.11 Short-circuit withstand strength
10.11.1 General
10.11.2 Circuits of assemblies which are exempted from the verification of the short-circuit withstand strength
100 10.11.3 Verification by comparison with a reference design – Using a checklist
10.11.4 Verification by comparison with a reference design(s) – Using calculation
10.11.5 Verification by test
106 10.12 Electromagnetic compatibility (EMC)
11 Routine verification
11.1 General
107 11.2 Degree of protection against contact with hazardous live parts, ingress of solid foreign bodies and water of enclosures
11.3 Clearances and creepage distances
11.4 Protection against electric shock and integrity of protective circuits
108 11.5 Incorporation of built-in components
11.6 Internal electrical circuits and connections
11.7 Terminals for external conductors
11.8 Mechanical operation
11.9 Dielectric properties
11.10 Wiring, operational performance and function
109 Tables
Table 1 – Minimum clearances in air (8.3.2)
110 Table 2 – Minimum creepage distances (8.3.3)
111 Table 3 – Cross-sectional area of a copper protective conductor (8.4.3.2.2)
Table 4 – Conductor selection and installation requirements (8.6.4)
Table 5 – Minimum terminal capacity for copper protective conductors (PE) (8.8)
112 Table 6 – Temperature-rise limits (9.2)
113 Table 7 – Values for the factor na (9.3.3)
Table 8 – Power-frequency withstand voltage for main circuits (10.9.2)
Table 9 – Power-frequency withstand voltage for auxiliary circuits (10.9.2)
Table 10 – Impulse withstand test voltages (10.9.3)
114 Table 11 – Copper test conductors for rated currents up to 400 A inclusive (10.10.2.3.2)
115 Table 12 – Copper test conductors for rated currents from 400 A to 7 000 A (10.10.2.3.2)
116 Table 13 – Short-circuit verification by comparison with reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)
117 Table 14 – Relationship between prospective fault current and diameter of copper wire
Table 15 – Climatic conditions
118 Annexes
Annex A (normative) Minimum and maximum cross-section of copper cables suitable for connection to terminals for external cables (see 8.8)
Table A.1 – Cross-section of copper cables suitable for connection to terminals for external cables
119 Annex B (normative) Method of calculating the cross-sectional area of protective conductors with regard to thermal stresses due to currents of short duration
Table B.1 – Values of k for insulated protective conductors not incorporated in cables or bare protective conductors in contact with cable covering
120 Annex C (informative) User information template
Table C.1 – User information template
124 Annex D (informative) Design verification
Table D.1 – List of design verifications to be performed
125 Annex E (informative) Rated diversity factor
E.1 General
E.2 Rated diversity factor for outgoing circuits within an assembly
E.2.1 General
126 Figures
Figure E.1 – Typical assembly
127 Table E.1 – Examples of loading for an assembly
128 E.2.2 Example of an assembly with an RDF of 0,68
Figure E.2 – Example 1: Table E.1 – Functional unit loading for an assembly with a rated diversity factor of 0,68
129 E.2.3 Example of an assembly with RDF declared for each section
Figure E.3 – Example 2: Table E.1 – Functional unit loading for an assembly with a rated diversity factor of 0,6 in Section B and 0,68 in Section C
130 Annex F (normative) Measurement of clearances and creepage distances 5F
F.1 Basic principles
F.2 Use of ribs
Table F.1 – Minimum width of grooves
134 Figure F.1 – Measurement of clearance and creepage distances
135 Annex G (normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment 6F
136 Table G.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
137 Annex H (informative) Operating current and power loss of copper cables
Table H.1 – Operating current and power loss of single-core copper cables with a permissible conductor temperature of 70 °C (ambient temperature inside the assembly: 55 °C)
138 Table H.2 – Reduction factor k1 for cables with a permissible conductor temperature of 70 °C (extract from IEC 60364-5-52:2009, Table B.52.14)
139 Annex I (informative) Thermal equivalent of an intermittent current
Figure I.1 – Example of average heating effect calculation
140 Annex J (normative) Electromagnetic compatibility (EMC)
J.1 General
Figure J.1 – Examples of ports
144 Table J.1 – Tests for EMC immunity for environment A (see J.10.12.2)
145 Table J.2 – Tests for EMC immunity for environment B (see J.10.12.2)
146 Table J.3 – Acceptance criteria when electromagnetic disturbances are present
147 Annex K (normative) Operating current and power loss of bare copper bars
Table K.1 – Operating current and power loss of bare copper bars with rectangular cross-section, run horizontally and arranged with their largest face vertical, frequency 50 Hz to 60 Hz (ambient air temperature inside the assembly: 55 °C,temperature of the conductor 70 °C)
148 Table K.2 – Factor k4 for different temperatures of the air inside the assembly and/or for the conductors
150 Annex L (informative) Guidance on verification of temperature-rise
L.1 General
L.1.1 Principles
L.1.2 Current ratings of assemblies
151 L.2 Temperature-rise limits
152 L.3 Test
L.3.1 General
L.3.2 Method a) – Verification of the complete assembly (10.10.2.3.5)
L.3.3 Method b) – Verification considering individual functional units separately and the complete assembly (10.10.2.3.6)
153 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)
L.4 Verification assessment
L.4.1 General
L.4.2 Single compartment assembly with a rated current (InA) not exceeding 630 A
L.4.3 Assembly with rated currents (InA) not exceeding 1 600 A
L.5 Verification by comparison with a reference design
154 Figure L.1 – Verification of temperature-rise
155 Annex M (normative) Verification of the short-circuit withstand strength of busbar structures by comparison with a reference design by calculation
M.1 General
M.2 Terms and definitions
Figure M.1 – Tested busbar structure (TS)
156 M.3 Method of verification
Figure M.2 – Non tested busbar structure (NTS)
157 M.4 Conditions for application
M.4.1 General
M.4.2 Peak short-circuit current
M.4.3 Thermal short-circuit strength
M.4.4 Busbar supports
M.4.5 Busbar connections, equipment connections
M.4.6 Angular busbar configurations
Figure M.3 – Angular busbar configuration with supports at the corners
158 M.4.7 Calculations with special regard to conductor oscillation
159 Annex N (informative) List of notes concerning certain countries
165 Bibliography

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