Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Interface characteristics
5.1 General
5.2 Voltage ratings
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
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
6.1 Assembly designation marking
6.2 Documentation
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
7.1 Normal service conditions
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
8.1 Strength of materials and parts
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
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
8.3.1 General
8.3.2 Clearances
8.3.3 Creepage distances
8.4 Protection against electric shock
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
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
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
9.1 Dielectric properties
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
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
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
10.1 General
10.2 Strength of materials and parts
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
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
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
10.9.1 General
10.9.2 Power-frequency withstand voltage
10.9.3 Impulse withstand voltage
10.9.4 Test of enclosures made of insulating material
10.9.5 External door or cover mounted operating handles of insulating material
10.9.6 Test of conductors and hazardous live parts covered by insulating material to provide protection against electric shock
10.10 Temperature-rise
10.10.1 General
10.10.2 Verification by test
10.10.3 Verification comparison
10.10.4 Verification assessment
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
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
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
Annex A (Normative) Minimum and maximum cross-sectional area of copper cables suitable for connection to terminals for external cables (see 8.8)
Annex B (Normative) Method of calculating the cross-sectional area of protective conductors with regard to thermal stresses due to currents of short duration
Annex C (Informative) User information template
Annex D (Informative) Design verification
Annex E (Informative) Rated diversity factor
E.1 General
E.2 Rated diversity factor for outgoing circuits within an assembly
Annex F (Normative) Measurement of clearances and creepage distances5)
F.1 Basic principles
F.2 Use of ribs
Annex G (Normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment 6)
Annex H (Informative) Operating current and power loss of copper cables
Annex I (Informative) Thermal equivalent of an intermittent current
Annex J (Normative) Electromagnetic compatibility (EMC)
J.1 General
J.3 Terms and definitions
Annex K (Normative) Operating current and power loss of bare copper bars
Annex L (Informative) Guidance on verification of temperature-rise
L.1 General
L.2 Temperature-rise limits
L.3 Test
L.4 Verification assessment
L.5 Verification by comparison with a reference design
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
M.3 Verification method
M.4 Conditions for application
Annex N (Informative) List of notes concerning certain countries
Bibliography
Figure E.1 Typical assembly
Figure E.2 Example 1: Table E.1 – Functional unit loading for an assembly with a rated diversity factor of 0.68
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
Figure F.1 Measurement of clearance and creepage distances
Figure I.1 Example of average heating effect calculation
Figure J.1 Examples of ports
Figure L.1 Verification of temperature-rise
Figure M.1 Tested busbar structure (TS)
Figure M.2 Nontested busbar structure (NTS)
Figure M.3 Angular busbar configuration with supports at the corners
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 limiting values (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 400A inclusive (10.10.2.3.2)
Table 12 Copper test conductors for rated currents from 400A to 7, 000A (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
Table A.1 Cross-section of copper cables suitable for connection to terminals for external cables
Table B.1 Values of k for insulated protective conductors not incorporated in cables or bare protective conductors in contact with cable covering
Table C.1 User information template
Table D.1 List of design verifications to be performed
Table E.1 Examples of loading for an assembly
Table F.1 Minimum width of grooves
Table G.1 Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
Table H.1 Operating current and power loss of single-core copper cables with a permissible conductor temperature of 70℃(ambient temperature inside the assembly: 55℃)
Table H.2 Reduction factor k1 for cables with a permissible conductor temperature of 70℃ (extract from GB/T 16895.6-2014, Table B.52.14)
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
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 50Hz to 60Hz (ambient air temperature inside the assembly: 55℃, temperature of the conductor 70℃)
Table K.2 Factor k4 for different temperatures of the air inside the assembly and/or for the conductors
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Interface characteristics
5.1 General
5.2 Voltage ratings
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
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
6.1 Assembly designation marking
6.2 Documentation
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
7.1 Normal service conditions
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
8.1 Strength of materials and parts
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
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
8.3.1 General
8.3.2 Clearances
8.3.3 Creepage distances
8.4 Protection against electric shock
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
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
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
9.1 Dielectric properties
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
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
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
10.1 General
10.2 Strength of materials and parts
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
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
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
10.9.1 General
10.9.2 Power-frequency withstand voltage
10.9.3 Impulse withstand voltage
10.9.4 Test of enclosures made of insulating material
10.9.5 External door or cover mounted operating handles of insulating material
10.9.6 Test of conductors and hazardous live parts covered by insulating material to provide protection against electric shock
10.10 Temperature-rise
10.10.1 General
10.10.2 Verification by test
10.10.3 Verification comparison
10.10.4 Verification assessment
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
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
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
Annex A (Normative) Minimum and maximum cross-sectional area of copper cables suitable for connection to terminals for external cables (see 8.8)
Annex B (Normative) Method of calculating the cross-sectional area of protective conductors with regard to thermal stresses due to currents of short duration
Annex C (Informative) User information template
Annex D (Informative) Design verification
Annex E (Informative) Rated diversity factor
E.1 General
E.2 Rated diversity factor for outgoing circuits within an assembly
Annex F (Normative) Measurement of clearances and creepage distances5)
F.1 Basic principles
F.2 Use of ribs
Annex G (Normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment 6)
Annex H (Informative) Operating current and power loss of copper cables
Annex I (Informative) Thermal equivalent of an intermittent current
Annex J (Normative) Electromagnetic compatibility (EMC)
J.1 General
J.3 Terms and definitions
Annex K (Normative) Operating current and power loss of bare copper bars
Annex L (Informative) Guidance on verification of temperature-rise
L.1 General
L.2 Temperature-rise limits
L.3 Test
L.4 Verification assessment
L.5 Verification by comparison with a reference design
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
M.3 Verification method
M.4 Conditions for application
Annex N (Informative) List of notes concerning certain countries
Bibliography
Figure E.1 Typical assembly
Figure E.2 Example 1: Table E.1 – Functional unit loading for an assembly with a rated diversity factor of 0.68
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
Figure F.1 Measurement of clearance and creepage distances
Figure I.1 Example of average heating effect calculation
Figure J.1 Examples of ports
Figure L.1 Verification of temperature-rise
Figure M.1 Tested busbar structure (TS)
Figure M.2 Nontested busbar structure (NTS)
Figure M.3 Angular busbar configuration with supports at the corners
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 limiting values (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 400A inclusive (10.10.2.3.2)
Table 12 Copper test conductors for rated currents from 400A to 7, 000A (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
Table A.1 Cross-section of copper cables suitable for connection to terminals for external cables
Table B.1 Values of k for insulated protective conductors not incorporated in cables or bare protective conductors in contact with cable covering
Table C.1 User information template
Table D.1 List of design verifications to be performed
Table E.1 Examples of loading for an assembly
Table F.1 Minimum width of grooves
Table G.1 Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage
Table H.1 Operating current and power loss of single-core copper cables with a permissible conductor temperature of 70℃(ambient temperature inside the assembly: 55℃)
Table H.2 Reduction factor k1 for cables with a permissible conductor temperature of 70℃ (extract from GB/T 16895.6-2014, Table B.52.14)
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
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 50Hz to 60Hz (ambient air temperature inside the assembly: 55℃, temperature of the conductor 70℃)
Table K.2 Factor k4 for different temperatures of the air inside the assembly and/or for the conductors
