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BS EN IEC 61439-1:2021 – TC

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Tracked Changes. Low-voltage switchgear and controlgear assemblies – General rules

Published By Publication Date Number of Pages
BSI 2021 380
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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.

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PDF Pages PDF Title
1 compares BS EN IEC 61439-1:2021
2 TRACKED CHANGES
Text example 1 — indicates added text (in green)
3 Contractual and legal considerations
4 Compliance with a British Standard cannot confer immunity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011 31 May 2021.
Amendments/corrigenda issued since publication
7 Endorsement notice
17 Table ZZ.1 — Correspondence between this European standard and Annex I of Directive 2014/35/EU [2014 OJ L96]
19 CONTENTS
26 INTERNATIONAL ELECTROTECHNICAL COMMISSION
28 INTRODUCTION
29 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR assemblies –
1 Scope
30 2 Normative references
33 3 Terms and definitions
3.1 General terms
3.1.1
34 3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
35 3.1.9
3.1.10
3.1.11
3.1.12
3.1.13
3.1.14
3.1.15
3.2 Constructional units of assembliesassemblies
3.2.1
36 3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
3.2.8
3.2.9
3.2.10
3.2.11
37 3.3 External design of assembliesassemblies
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.3.10
3.3.11
38 3.4 Structural parts of assembliesassemblies
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.4.8
3.4.9
3.4.10
3.4.11
39 3.4.12
3.4.13
3.4.14
3.4.15
3.5 Conditions of installation of assembliesassemblies
3.5.1
3.5.2
3.5.3
3.5.4
3.6 Insulation characteristics
3.6.1
40 3.6.4
3.6.5
3.6.6
3.6.7
3.6.8
41 3.6.9
3.6.10
3.6.10.2
3.6.11
3.6.12
42 3.6.13
3.6.14
3.6.15
3.6.16
3.6.17
3.7 Protection against electric shock
3.7.1
43 3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
3.7.7
44 3.7.8
3.7.9
3.7.10
3.7.10
3.7.11
3.7.11
45 3.7.12
3.7.123.7.13
3.7.14
3.7.133.7.15
3.7.143.7.16
3.7.153.7.17
3.7.18
46 3.7.19
3.7.20
3.7.21
3.7.22
3.7.23
3.7.24
3.7.25
47 3.8 Characteristics
3.8.1
3.8.2
3.8.3
3.8.4
3.8.5
3.8.6
3.8.7
48 3.8.8
3.8.9
3.8.9.2
3.8.9.3
3.8.9.4
49 3.8.10
3.8.10.2
3.8.10.3
3.8.10.4
3.8.10.5
3.8.10.6
50 3.8.10.7
3.8.10.8
3.8.11
3.8.11
3.8.12
3.8.13
3.9 Verification
3.9.1
51 3.9.1.1
3.9.1.2
3.9.1.3
3.9.1.4
3.9.2
3.9.3
3.10 Manufacturer/user
3.10.1
3.10.2
3.10.33.11
52 4 Symbols and abbreviations
53 5 Interface characteristics
5.1 General
5.2 Voltage ratings
54 5.2.2 Rated operational voltage (Ue) (of a circuit of an assemblyassembly)
5.2.3 Rated insulation voltage (Ui) (of a circuit of an assemblyassembly)
5.2.4 Rated impulse withstand voltage (Uimp) (of the assemblyassembly)
5.3 Current ratings
55 5.3.2 Rated current of a main outgoing circuit (Inc)
5.3.3 Group rated current of a main circuit (Ing)
56 5.3.35.3.4 Rated peak withstand current (Ipk)
5.3.45.3.5 Rated short-time withstand current (Icw) (of a main circuit of an assemblyassembly)
5.3.55.3.6 Rated conditional short-circuit current of an assembly (Icc) (of an assembly or a circuit of an assembly)
5.4 Rated diversity factor (RDF)
57 5.5 Rated frequency (fn)
5.6 Other characteristics
58 6 Information
6.1 assemblyAssembly designation marking
6.2 Documentation
6.2.2 Instructions for handling, installation, operation and maintenance
59 6.3 Device and/or component identification
7 Service conditions
7.1 Normal service conditions
7.1.1 Ambient air temperature
7.1.1.2 Ambient air temperature for outdoor installations
7.1.2 Humidity conditions
7.1.2.2 Humidity conditions for outdoor installations
60 7.1.37.1.2 Pollution degree
7.1.4 Altitude
7.2 Special service conditions
61 7.3 Conditions during transport, storage and installation
8 Constructional requirements
8.1 Strength of materials and parts
8.1.1 General
62 8.1.2 Protection against corrosion
8.1.3 Properties of insulating materials
8.1.3.2 Resistance of insulating materials to heat and fire
8.1.3.2.2 Resistance of insulating materials to normal heat
8.1.3.2.3 Resistance of insulating materials to abnormal heat and fire due to internal electric effects
8.1.4 Resistance to ultra-violet (UV) radiation
63 8.1.5 Mechanical strength
8.1.6 Lifting provision
8.2 Degree of protection provided by an assemblyassembly 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)
64 8.2.3 assemblyAssembly with removable parts
8.3 Clearances and creepage distances
8.3.1 General
65 8.3.2 Clearances
8.3.3 Creepage distances
8.4 Protection against electric shock
8.4.1 General
8.4.2 Basic protection
66 8.4.2.2 Basic insulation provided by insulating material
8.4.2.3 Barriers or enclosures
67 8.4.3 Fault protection
8.4.3.2 Requirements for the protective conductor to facilitate automatic disconnection of the supply
8.4.3.2.2 Requirements for earth continuity providing protection against the consequences of faults within the assemblyclass I assembly
68 8.4.3.2.3 Requirements for protective conductors providing protection against the consequences of earth faults in external circuits supplied through the assembly class I or class II assemblies
69 8.4.3.3 Electrical separation
8.4.4 Protection by total insulation
8.4.4 Additional requirements for class II assemblies
70 8.4.5 Limitation of steady-state touch currentcurrents and charge
8.4.6 Operating and servicing conditions
8.4.6.1 Devices to be operated or components to be replaced by ordinary persons
71 8.4.6.2 Requirements related to accessibility in service by authorized persons
8.4.6.2.1 General
8.4.6.2.2 Requirements related to accessibility for inspection and similar operations
8.4.6.2.3 Requirements related to accessibility for maintenance
72 8.4.6.2.5 Obstacles
8.5 Incorporation of switching devices and components
8.5.1 Fixed parts
8.5.2 Removable parts
73 8.5.3 Selection of switching devices and components
8.5.4 Installation of switching devices and components
8.5.5 Accessibility
74 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
75 8.6.2 Auxiliary circuits
8.6.3 Bare and insulated conductors
76 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
77 8.7 Cooling
8.8 Terminals for external conductorscables
78 9 Performance requirements
9.1 Dielectric properties
9.1.2 Power-frequency withstand voltage
79 9.1.3 Impulse withstand voltage
9.1.3.1 Impulse with stand voltages of main circuits
9.1.3.2 Impulse withstand voltages of auxiliary circuits
9.1.4 Protection of surge protective devices
9.2 Temperature-rise limits
80 9.2.2 Adjustment of rated currents for alternative ambient air temperatures
9.3 Short-circuit protection and short-circuit withstand strength
9.3.1 General
9.3.2 Information concerning short-circuit withstand strength
81 9.3.3 Relationship between peak current and short-time current
9.3.4 Co-ordinationCoordination of protective devices
9.4 Electromagnetic compatibility (EMC)
82 10 Design verification
10.1 General
83 10.2 Strength of materials and parts
10.2.2 Resistance to corrosion
84 10.2.2.2 Severity test A
10.2.2.3 Severity test B
10.2.2.4 Results to be obtained
85 10.2.2.5 Verification by comparison to reference design
10.2.3 Properties of insulating materials
10.2.3.1 Thermal stability
10.2.3.110.2.3.1.1 Verification of thermal stability of enclosures by test
10.2.3.1.2 Verification of thermal stability of enclosures by comparison
10.2.3.2 Verification of resistance of insulating materials to abnormal heat and fire due to internal electric effects
86 10.2.3.2.2 Verification by comparison to a reference design
10.2.3.2.3 Verification by assessment
10.2.4 Resistance to ultra-violetultraviolet (UV) radiation
UV test according to ISO 4892-2 Method A, Cycle 1 providing a total test period of 500 h. For enclosures constructed of insulating materials compliance is checked by verification that the flexural strength (according to ISO 178) and Charpy impact (acc…
87 10.2.4.1.1 Verification for enclosures and external parts of assemblies constructed of insulating materials
10.2.4.1.2 Verification for enclosures and external parts of assemblies coated on their exposed surface(s) by synthetic material
10.2.4.2 Verification by comparison to a reference design
88 10.2.4.3 Verification by assessment
10.2.5 Lifting
10.2.5.2 Verification by comparison to a reference design
10.2.6 MechanicalVerification of protection against mechanical impact (IK code)
10.2.7 Marking
10.2.7.2 Verification by comparison to a reference design
89 10.2.8 Mechanical operation
10.2.8.1 Verification by test
10.2.8.2 Verification by comparison to a reference design
10.3 Degree of protection of assembliesassemblies (IP Code)
90 10.4 Clearances and creepage distances
10.5 Protection against electric shock and integrity of protective circuits
10.5.2 Effective earth continuity between the exposed-conductive-parts of the assemblyclass I assembly and the protective circuit
10.5.3.2 Protective circuits that are exempted from short-circuit withstand verification
91 10.5.3.3 Verification by comparison with a reference design – Utilising designs – Using a checklist
10.5.3.4 Verification by comparison with a reference design – Utilisingdesigns – Using calculation
10.5.3.5 Verification by test
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
92 10.9 Dielectric properties
10.9.1 General
10.9.2 Power-frequency withstand voltage
10.9.2.1 Main and auxiliary and control circuits
10.9.2.2 Test voltage
94 10.9.3.5 Verification assessment
95 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 Verification of temperatureTemperature-rise
96 10.10.2 Verification by testing
10.10.2.2 Selection of the representative arrangement
10.10.2.2.1 General
10.10.2.2.2 Busbars
97 10.10.2.2.3 Functional units
10.10.2.3 Methods of test
10.10.2.3.1 General
99 10.10.2.3.2 Test conductors
100 10.10.2.3.3 Measurement of temperatures
10.10.2.3.4 Ambient air temperature
10.10.2.3.5 Verification of the complete assemblyassembly
10.10.2.3.6 Verification considering individual functional units separately and the complete assemblyassembly
101 10.10.2.3.7 Verification considering individual functional units and the main and distribution busbars separately as well as the complete assemblyassembly
102 10.10.2.3.8 Results to be obtained
10.10.3 Derivation of ratings for similar variants
10.10.3 Verification by comparison
10.10.3.2 assembliesAssemblies
103 10.10.3.3 Busbars
10.10.3.4 Functional units
10.10.3.5 Functional units – Device Temperature-rise considerations for device substitution
104 10.10.3.6 Calculation of currents based on adjustment of ambient air temperature
10.10.4 Verification assessment
105 10.10.4.2 Single compartment assembly with rated current not exceeding 630 A
10.10.4.2.1 Verification method
10.10.4.2.2 Determination of the power loss capability of an enclosure by test
106 10.10.4.2.3 Results to be obtained
10.10.4.3 assembly with rated current not exceeding 1 600 A
10.10.4.3.1 Verification method
107 10.10.4 Verification assessment
108 10.10.4.2 Single compartment assembly with natural cooling and rated current (InA) not exceeding 630 A
10.10.4.2.2 Determination of the power loss capability of an enclosure by test
10.10.4.2.3 Results to be obtained
10.10.4.3 Assembly with natural cooling and rated current (InA) not exceeding 1 600 A
10.10.4.3.1 Verification method
109 10.10.4.3.2 Results to be obtained
10.11 Short-circuit withstand strength
10.11.2 Circuits of assembliesassemblies which are exempted from the verification of the short- circuit withstand strength
10.11.3 Verification by comparison with a reference design – UtilisingUsing a checklist
110 10.11.4 Verification by comparison with a reference design – Utilising(s) – Using calculation
10.11.5 Verification by test
10.11.5.2 Performance of the test – General
111 10.11.5.3 Testing of main circuits
10.11.5.3.1 General
10.11.5.3.2 Outgoing circuits
10.11.5.3.3 Incoming circuit and main busbars
112 10.11.5.3.4 Connections to the supply side of outgoing units
10.11.5.3.5 Neutral or mid-point conductor
10.11.5.3.5.1 Neutral conductor
10.11.5.3.5.2 Mid-point conductor
113 10.11.5.4 Value and duration of the short-circuit current
114 10.11.5.5 Results to be obtained
115 10.11.5.6 Testing of the protective circuit
10.11.5.6.1 General
10.11.5.6.2 Results to be obtained
116 10.12 Electromagnetic compatibility (EMC)
10.13 Mechanical operation
11 Routine verification
11.1 General
117 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
11.5 Incorporation of built-in components
11.6 Internal electrical circuits and connections
11.7 Terminals for external conductors
11.8 Mechanical operation
118 11.9 Dielectric properties
11.10 Wiring, operational performance and function
Table 1 – Minimum clearances in air a (8.3.2)
119 Table 2 – Minimum creepage distances (8.3.3)
120 Table 3 – Cross-sectional area of a copper protective conductor (8.4.3.2.2)
121 Table 6 – Temperature-rise limits (9.2)
122 Table 7 – Values for the factor na (9.3.3)
123 Table 11 – Copper test conductors for rated currents up to 400 A inclusive (10.10.2.3.2)
124 Table 12 – Copper test conductors for rated currents from 400 A to 4 000 A (10.10.2.3.2)
Table 12 – Copper test conductors for rated currents from 400 A to 7 000 A (10.10.2.3.2)
125 Table 13 – Short-circuit verification by comparison with a reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)
126 Table 13 – Short-circuit verification by comparison with reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)
127 Table 14 – Relationship between prospective fault current and diameter of copper wire
128 Annex A
(normative)
Table A.1 – Cross-section of copper conductorscables suitable for connection to terminals for external conductorscables
129 Annex B
(normative)
Table B.1 – Values of k for insulated protective conductors not incorporated in cables or bare protective conductors in contact with cable covering
130 Annex C
(informative)
Table C.1 – Template
138 Annex D
(informative)
Table D.1 – List of design verifications to be performed
139 Table D.1 – List of design verifications to be performed
140 Annex E
(informative)
E.1 General
E.2 Rated diversity factor of an assemblyfor outgoing circuits within an assembly
E.2.1 General
141 Figure E.1 – Typical assembly
142 Figure E.1 – Typical assembly
143 Table E.1 – Examples of loading for an assembly with a rated diversity factor of 0,8
145 Figure E.2 – Example 1: Table E.1 – Functional unit loading for an assembly with a rated diversity factor of 0,8
146 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
148 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
153 Annex F
(normative)
F.1 Basic principles
Table F.1 – Minimum width of grooves
F.2 Use of ribs
162 Annex G
(normative)
163 Table G.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
164 Table G.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
165 Annex H
(informative)
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)
166 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)
167 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)
168 Annex I
(Void)
169 Annex I
(informative)
Figure I.1 – Example of average heating effect calculation
170 Annex J
(normative)
J.1 General
J.2J.3 Terms and definitions
J.3.8.13.1
Figure J.1 – Examples of ports
J.3.8.13.2
J.3.8.13.3
J.3.8.13.4
171 J.3.8.13.5
J.3.8.13.6
J.9.4 Performance requirements
172 J.9.4.2 Requirement for testing
J.9.4.3 Immunity
J.9.4.3.1 assembliesAssemblies not incorporating electronic circuits
J.9.4.3.2 assembliesAssemblies incorporating electronic circuits
J.9.4.4 Emission
J.9.4.4.1 assembliesAssemblies not incorporating electronic circuits
J.9.4.4.2 assembliesAssemblies incorporating electronic circuits
173 J.10.12 Tests for EMC
J.10.12.1J.10.12.2 Immunity tests
J.10.12.1.1J.10.12.2.1 assembliesAssemblies not incorporating electronic circuits
J.10.12.1.2J.10.12.2.2 assembliesAssemblies incorporating electronic circuits
J.10.12.2J.10.12.3 Emission tests
J.10.12.2.1J.10.12.3.1 assembliesAssemblies not incorporating electronic circuits
J.10.12.2.2J.10.12.3.2 assemblies Assemblies incorporating electronic circuits
178 Table J.3 – Acceptance criteria when electromagnetic disturbances are present
179 Annex K
(normative)
K.2 Electrical separation
K.2.1 General
K.2.2 Supply source
K.2.3 Selection and installation of supply source
180 K.2.3.2 Installation
K.2.4 Supply of a single item of apparatus
K.2.5 Supply of more than one item of apparatus
181 Table K.1 – Maximum disconnecting times for TN systems
K.3 Class II equipment or equivalent insulation
182 Annex L
(informative)
Table L.1 – Minimum clearances in air
183 Annex M
(informative)
Table M.1 – North American temperature rise limits
184 Table N.1Table 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 assemblyassembly: 55…
185 Table N.2Table K.2 – Factor k4 for different temperatures of the air inside the assemblyassembly and/or for the conductors
187 Annex OAnnex L
(informative)
O.1L.1 General
L.1.1 Principles
L.1.2 Current ratings of assemblies
L.1.2.2 Group rated current of main circuits (Ing)
L.1.2.3 Current rating of an assembly (InA)
188 L.1.2.4 Rated current of a circuit of an assembly (Inc)
L.1.2.5 Rated current of a device (In)
O.2L.2 Temperature-rise limits
189 O.3L.3 Test
O.3.1L.3.1 General
O.3.2L.3.2 Method a) – Verification of the complete assembly assembly (10.10.2.3.5)
190 O.3.3L.3.3 Method b) – Verification considering individual functional units separately and the complete assemblyassembly (10.10.2.3.6)
O .3.4L.3.4 Method c) – Verification considering individual functional units and the main and distribution busbars separately as well as the complete assemblyassembly (10.10.2.3.7)
O.4 Calculation
L.4 Verification assessment
O.4.1L.4.1 General
O.4.2L.4.2 Single compartment assembly with a rated current (InA) not exceeding 630 A
191 O.4.3L.4.3 assemblyAssembly with rated currents (InA) not exceeding 1 600 A
O.5 Design rules
L.5 Verification by comparison with a reference design
194 Annex PAnnex M
(normative)
P.1M.1 General
P.2M.2 Terms and definitions
P.2.1M.2.1
Figure P.1 – Tested busbar structure (TS)
195 Figure M.1 – Tested busbar structure (TS)
P.2.2M.2.2
196 Figure P.2 – Non tested busbar structure (NTS)
197 Figure M.2 – Non tested busbar structure (NTS)
P.4M.4 Conditions for application
P.4.1M.4.1 General
198 P.4.2M.4.2 Peak short-circuit current
P.4.3M.4.3 Thermal short-circuit strength
P.4.4M.4.4 Busbar supports
P.4.5M.4.5 Busbar connections, equipment connections
P.4.6M.4.6 Angular busbar configurations
Figure P.3 – Angular busbar configuration with supports at the corners
199 Figure M.3 – Angular busbar configuration with supports at the corners
P.4.7M.4.7 Calculations with special regard to conductor oscillation
200 Annex N
(informative)
206 Bibliography
212 undefined
218 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
222 Annex ZZ (informative)Relationship between this European standard and the safety objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be covered
225 English
CONTENTS
231 FOREWORD
233 INTRODUCTION
234 1 Scope
2 Normative references
237 3 Terms and definitions
3.1 General terms
239 3.2 Constructional units of assemblies
241 3.3 External design of assemblies
242 3.4 Structural parts of assemblies
243 3.5 Conditions of installation of assemblies
3.6 Insulation characteristics
246 3.7 Protection against electric shock
250 3.8 Characteristics
254 3.9 Verification
255 3.10 Manufacturer
4 Symbols and abbreviations
256 5 Interface characteristics
5.1 General
5.2 Voltage ratings
5.2.1 Rated voltage (Un) (of the assembly)
257 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)
258 5.3.3 Group rated current of a main circuit (Ing)
5.3.4 Rated peak withstand current (Ipk)
259 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)
260 5.6 Other characteristics
6 Information
6.1 Assembly designation marking
6.2 Documentation
6.2.1 Information relating to the assembly
261 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
262 7.1.2 Pollution degree
7.2 Special service conditions
263 7.3 Conditions during transport, storage and installation
8 Constructional requirements
8.1 Strength of materials and parts
8.1.1 General
264 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
265 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)
266 8.2.3 Assembly with removable parts
8.3 Clearances and creepage distances
8.3.1 General
8.3.2 Clearances
267 8.3.3 Creepage distances
8.4 Protection against electric shock
8.4.1 General
8.4.2 Basic protection
268 8.4.3 Fault protection
271 8.4.4 Additional requirements for class II assemblies
272 8.4.5 Limitation of steady-state touch currents and charge
8.4.6 Operating and servicing conditions
273 8.5 Incorporation of switching devices and components
8.5.1 Fixed parts
274 8.5.2 Removable parts
8.5.3 Selection of switching devices and components
8.5.4 Installation of switching devices and components
275 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
276 8.6.2 Auxiliary circuits
8.6.3 Bare and insulated conductors
278 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
280 9 Performance requirements
9.1 Dielectric properties
9.1.1 General
9.1.2 Power-frequency withstand voltage
9.1.3 Impulse withstand voltage
281 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
282 9.3 Short-circuit protection and short-circuit withstand strength
9.3.1 General
9.3.2 Information concerning short-circuit withstand strength
283 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
285 10.2 Strength of materials and parts
10.2.1 General
10.2.2 Resistance to corrosion
287 10.2.3 Properties of insulating materials
288 10.2.4 Resistance to ultraviolet (UV) radiation
289 10.2.5 Lifting
290 10.2.6 Verification of protection against mechanical impact (IK code)
10.2.7 Marking
10.2.8 Mechanical operation
291 10.3 Degree of protection of assemblies (IP Code)
292 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
293 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
294 10.9 Dielectric properties
10.9.1 General
10.9.2 Power-frequency withstand voltage
295 10.9.3 Impulse withstand voltage
297 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
298 10.10.2 Verification by testing
304 10.10.3 Verification by comparison
307 10.10.4 Verification assessment
309 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
310 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
316 10.12 Electromagnetic compatibility (EMC)
11 Routine verification
11.1 General
317 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
318 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
319 Tables
Table 1 – Minimum clearances in air (8.3.2)
320 Table 2 – Minimum creepage distances (8.3.3)
321 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)
322 Table 6 – Temperature-rise limits (9.2)
323 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)
324 Table 11 – Copper test conductors for rated currents up to 400 A inclusive (10.10.2.3.2)
325 Table 12 – Copper test conductors for rated currents from 400 A to 7 000 A (10.10.2.3.2)
326 Table 13 – Short-circuit verification by comparison with reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)
327 Table 14 – Relationship between prospective fault current and diameter of copper wire
Table 15 – Climatic conditions
328 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
329 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
330 Annex C (informative) User information template
Table C.1 – User information template
334 Annex D (informative) Design verification
Table D.1 – List of design verifications to be performed
335 Annex E (informative) Rated diversity factor
E.1 General
E.2 Rated diversity factor for outgoing circuits within an assembly
E.2.1 General
336 Figures
Figure E.1 – Typical assembly
337 Table E.1 – Examples of loading for an assembly
338 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
339 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
340 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
344 Figure F.1 – Measurement of clearance and creepage distances
345 Annex G (normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment 6F
346 Table G.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
347 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)
348 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)
349 Annex I (informative) Thermal equivalent of an intermittent current
Figure I.1 – Example of average heating effect calculation
350 Annex J (normative) Electromagnetic compatibility (EMC)
J.1 General
Figure J.1 – Examples of ports
354 Table J.1 – Tests for EMC immunity for environment A (see J.10.12.2)
355 Table J.2 – Tests for EMC immunity for environment B (see J.10.12.2)
356 Table J.3 – Acceptance criteria when electromagnetic disturbances are present
357 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)
358 Table K.2 – Factor k4 for different temperatures of the air inside the assembly and/or for the conductors
360 Annex L (informative) Guidance on verification of temperature-rise
L.1 General
L.1.1 Principles
L.1.2 Current ratings of assemblies
361 L.2 Temperature-rise limits
362 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)
363 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
364 Figure L.1 – Verification of temperature-rise
365 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)
366 M.3 Method of verification
Figure M.2 – Non tested busbar structure (NTS)
367 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
368 M.4.7 Calculations with special regard to conductor oscillation
369 Annex N (informative) List of notes concerning certain countries
375 Bibliography
BS EN IEC 61439-1:2021 - TC
$280.87