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eLibrary > BS EN IEC 61439-1:2021 + Ex Comm Low-voltage switchgear and controlgear assemblies - General rules >

BS EN IEC 61439-1:2021 + Ex Comm Low-voltage switchgear and controlgear assemblies - General rules, 2021

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BS EN IEC 61439-1:2021 + Ex Comm Low-voltage switchgear and controlgear assemblies - General rules, 2021

30301662-WEB (1).pdf [Go to Page]
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Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
Annex ZZ (informative)Relationship between this European standard and the safety objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be covered
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General terms
3.2 Constructional units of assemblies
3.3 External design of assemblies
3.4 Structural parts of assemblies
3.5 Conditions of installation of assemblies
3.6 Insulation characteristics
3.7 Protection against electric shock
3.8 Characteristics
3.9 Verification
3.10 Manufacturer
4 Symbols and abbreviations
5 Interface characteristics [Go to Page]
5.1 General
5.2 Voltage ratings [Go to Page]
5.2.1 Rated voltage (Un) (of the assembly)
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 [Go to Page]
5.3.1 Rated current of an assembly (InA)
5.3.2 Rated current of a main outgoing circuit (Inc)
5.3.3 Group rated current of a main circuit (Ing)
5.3.4 Rated peak withstand current (Ipk)
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)
5.6 Other characteristics
6 Information [Go to Page]
6.1 Assembly designation marking
6.2 Documentation [Go to Page]
6.2.1 Information relating to the assembly
6.2.2 Instructions for handling, installation, operation and maintenance
6.3 Device and/or component identification
7 Service conditions [Go to Page]
7.1 Normal service conditions [Go to Page]
7.1.1 Climatic conditions
7.1.2 Pollution degree
7.2 Special service conditions
7.3 Conditions during transport, storage and installation
8 Constructional requirements [Go to Page]
8.1 Strength of materials and parts [Go to Page]
8.1.1 General
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
8.1.6 Lifting provision
8.2 Degree of protection provided by an assembly enclosure [Go to Page]
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)
8.2.3 Assembly with removable parts
8.3 Clearances and creepage distances [Go to Page]
8.3.1 General
8.3.2 Clearances
8.3.3 Creepage distances
8.4 Protection against electric shock [Go to Page]
8.4.1 General
8.4.2 Basic protection
8.4.3 Fault protection
8.4.4 Additional requirements for class II assemblies
8.4.5 Limitation of steady-state touch currents and charge
8.4.6 Operating and servicing conditions
8.5 Incorporation of switching devices and components [Go to Page]
8.5.1 Fixed parts
8.5.2 Removable parts
8.5.3 Selection of switching devices and components
8.5.4 Installation of switching devices and components
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 [Go to Page]
8.6.1 Main circuits
8.6.2 Auxiliary circuits
8.6.3 Bare and insulated conductors
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
9 Performance requirements [Go to Page]
9.1 Dielectric properties [Go to Page]
9.1.1 General
9.1.2 Power-frequency withstand voltage
9.1.3 Impulse withstand voltage
9.1.4 Protection of surge protective devices
9.2 Temperature-rise limits [Go to Page]
9.2.1 General
9.2.2 Adjustment of rated currents for alternative ambient air temperatures
9.3 Short-circuit protection and short-circuit withstand strength [Go to Page]
9.3.1 General
9.3.2 Information concerning short-circuit withstand strength
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 [Go to Page]
10.1 General
10.2 Strength of materials and parts [Go to Page]
10.2.1 General
10.2.2 Resistance to corrosion
10.2.3 Properties of insulating materials
10.2.4 Resistance to ultraviolet (UV) radiation
10.2.5 Lifting
10.2.6 Verification of protection against mechanical impact (IK code)
10.2.7 Marking
10.2.8 Mechanical operation
10.3 Degree of protection of assemblies (IP Code)
10.4 Clearances and creepage distances
10.5 Protection against electric shock and integrity of protective circuits [Go to Page]
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
10.6 Incorporation of switching devices and components [Go to Page]
10.6.1 General
10.6.2 Electromagnetic compatibility
10.7 Internal electrical circuits and connections
10.8 Terminals for external conductors
10.9 Dielectric properties [Go to Page]
10.9.1 General
10.9.2 Power-frequency withstand voltage
10.9.3 Impulse withstand voltage
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 [Go to Page]
10.10.1 General
10.10.2 Verification by testing
10.10.3 Verification by comparison
10.10.4 Verification assessment
10.11 Short-circuit withstand strength [Go to Page]
10.11.1 General
10.11.2 Circuits of assemblies which are exempted from the verification of the short-circuit withstand strength
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
10.12 Electromagnetic compatibility (EMC)
11 Routine verification [Go to Page]
11.1 General
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
11.9 Dielectric properties
11.10 Wiring, operational performance and function
Tables [Go to Page]
Table 1 – Minimum clearances in air (8.3.2)
Table 2 – Minimum creepage distances (8.3.3)
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)
Table 6 – Temperature-rise limits (9.2)
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)
Table 11 – Copper test conductors for rated currents up to 400 A inclusive (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)
Table 13 – Short-circuit verification by comparison with reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)
Table 14 – Relationship between prospective fault current and diameter of copper wire
Table 15 – Climatic conditions
Annexes [Go to Page]
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
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
Annex C (informative) User information template
Table C.1 – User information template
Annex D (informative) Design verification
Table D.1 – List of design verifications to be performed
Annex E (informative) Rated diversity factor [Go to Page]
E.1 General
E.2 Rated diversity factor for outgoing circuits within an assembly [Go to Page]
E.2.1 General
Figures [Go to Page]
Figure E.1 – Typical assembly
Table E.1 – Examples of loading for an assembly [Go to Page]
[Go to Page]
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 [Go to Page]
[Go to Page]
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
Annex F (normative) Measurement of clearances and creepage distances 5F [Go to Page]
F.1 Basic principles
F.2 Use of ribs
Table F.1 – Minimum width of grooves
Figure F.1 – Measurement of clearance and creepage distances
Annex G (normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment 6F
Table G.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
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)
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)
Annex I (informative) Thermal equivalent of an intermittent current
Figure I.1 – Example of average heating effect calculation
Annex J (normative) Electromagnetic compatibility (EMC) [Go to Page]
J.1 General
Figure J.1 – Examples of ports
Table J.1 – Tests for EMC immunity for environment A (see J.10.12.2)
Table J.2 – Tests for EMC immunity for environment B (see J.10.12.2)
Table J.3 – Acceptance criteria when electromagnetic disturbances are present
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)
Table K.2 – Factor k4 for different temperatures of the air inside the assembly and/or for the conductors
Annex L (informative) Guidance on verification of temperature-rise [Go to Page]
L.1 General [Go to Page]
L.1.1 Principles
L.1.2 Current ratings of assemblies
L.2 Temperature-rise limits
L.3 Test [Go to Page]
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)
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 [Go to Page]
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
Figure L.1 – Verification of temperature-rise
Annex M (normative) Verification of the short-circuit withstand strength of busbar structures by comparison with a reference design by calculation [Go to Page]
M.1 General
M.2 Terms and definitions
Figure M.1 – Tested busbar structure (TS) [Go to Page]
M.3 Method of verification
Figure M.2 – Non tested busbar structure (NTS) [Go to Page]
M.4 Conditions for application [Go to Page]
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 [Go to Page]
[Go to Page]
M.4.7 Calculations with special regard to conductor oscillation
Annex N (informative) List of notes concerning certain countries
Bibliography
30438884-WEB.pdf [Go to Page]
1 Overview [Go to Page]
1.1 Reasons for change
1.2 Summary
2 Main commentary [Go to Page]
2.1 Greater focus on DC assemblies
2.2 Group rated current of a main circuit
2.3 Macro and micro environment
2.4 Class I and Class II assemblies
2.5 Deterioration of insulation over time
3 Wider context
4 Conclusion
5 Further reading
Author
Technical reviewer
Disclaimer [Go to Page]

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BS EN IEC 61439-1:2021 + Ex Comm Low-voltage switchgear and controlgear assemblies - General rules, 2021

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