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 |
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.
PDF Catalog
PDF Pages | PDF Title |
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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 |