1、 IEC 62052-31 Edition 1.0 2015-09 INTERNATIONAL STANDARD Electricity metering equipment (AC) General requirements, tests and test conditions Part 31: Product safety requirements and tests IEC 62052-31:2015-09(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switz
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11、ral requirements, tests and test conditions Part 31: Product safety requirements and tests INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 19.080: 91.140.50 ISBN 978-2-8322-2848-7 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publicatio
12、n from an authorized distributor. colour inside 2 IEC 62052-31:2015 IEC 2015 CONTENTS FOREWORD . 8 INTRODUCTION . 10 1 Scope and object . 12 1.1 Scope . 12 1.2 Object . 13 1.2.1 Aspects included in scope . 13 1.2.2 Aspects excluded from scope 13 1.3 Verification 14 1.4 Environmental conditions 14 1.
13、4.1 Normal environmental conditions . 14 1.4.2 Extended environmental conditions . 14 1.4.3 Extreme environmental conditions . 15 2 Normative references 15 3 Terms and definitions 16 3.1 Equipment and states of equipment 16 3.2 Parts and accessories . 17 3.3 Quantities . 19 3.4 Tests 21 3.5 Safety t
14、erms . 21 3.6 Insulation 25 3.7 Terms related to switches of metering equipment 29 4 Tests . 31 4.1 General . 31 4.2 Type test sequence of tests . 31 4.3 Reference test conditions 32 4.3.1 Atmospheric conditions 32 4.3.2 State of the equipment . 32 4.4 Testing in single fault condition . 36 4.4.1 Ge
15、neral . 36 4.4.2 Application of fault conditions 36 4.4.3 Duration of tests 38 4.4.4 Conformity after application of fault conditions . 38 5 Information and marking requirements . 39 5.1 General . 39 5.2 Labels, signs and signals 41 5.2.1 General . 41 5.2.2 Durability of markings 43 5.3 Information
16、for selection . 43 5.3.1 General . 43 5.3.2 General information . 43 5.3.3 Information related to meters / metering elements . 44 5.3.4 Information related to stand-alone tariff-and load control equipment 44 5.3.5 Information related to supply control and load control switches 44 5.4 Information for
17、 installation and commissioning 44 5.4.1 General . 44 5.4.2 Handling and mounting 45 IEC 62052-31:2015 IEC 2015 3 5.4.3 Enclosure 45 5.4.4 Connection 45 5.4.5 Protection 47 5.4.6 Auxiliary power supply . 48 5.4.7 Supply for external devices 48 5.4.8 Batteries 48 5.4.9 Self-consumption . 48 5.4.10 Co
18、mmissioning 49 5.5 Information for use 49 5.5.1 General . 49 5.5.2 Display, push buttons and other controls . 49 5.5.3 Switches 49 5.5.4 Connection to users equipment . 50 5.5.5 External protection devices 50 5.5.6 Cleaning 50 5.6 Information for maintenance 50 6 Protection against electrical shock
19、. 50 6.1 General requirements . 50 6.2 Determination of accessible parts . 51 6.2.1 General . 51 6.2.2 Examination . 51 6.2.3 Openings above parts that are hazardous live . 52 6.2.4 Openings for pre-set controls . 52 6.2.5 Wiring terminals . 53 6.3 Limit values for accessible parts . 53 6.3.1 Genera
20、l . 53 6.3.2 Levels in normal condition . 53 6.3.3 Levels in single fault condition . 53 6.4 Primary means of protection (protection against direct contact) 56 6.4.1 General . 56 6.4.2 Equipment case . 56 6.4.3 Basic insulation . 56 6.4.4 Impedance . 56 6.5 Additional means of protection in case of
21、single fault conditions (protection against indirect contact) 57 6.5.1 General . 57 6.5.2 Protective bonding . 57 6.5.3 Supplementary insulation and reinforced insulation . 61 6.5.4 Protective impedance 61 6.5.5 Automatic disconnection of the supply . 61 6.5.6 Current- or voltage-limiting device . 6
22、2 6.6 Connection to external circuits 62 6.6.1 General . 62 6.6.2 Terminals for external circuits 63 6.6.3 Terminals for stranded conductors . 63 6.7 Insulation requirements . 63 6.7.1 General Electrical stresses, overvoltages and overvoltage categories. 63 6.7.2 The nature of insulation . 64 6.7.3
23、Insulation requirements for mains-circuits 68 4 IEC 62052-31:2015 IEC 2015 6.7.4 Insulation requirements for non-mains-circuits . 74 6.7.5 Insulation in circuits not addressed in 0 or 6.7.4 78 6.7.6 Reduction of transient overvoltages by the use of overvoltage limiting devices 84 6.8 Insulation requ
24、irements between circuits and parts . 84 6.9 Constructional requirements for protection against electric shock . 88 6.9.1 General . 88 6.9.2 Insulating materials . 88 6.9.3 Colour coding 88 6.9.4 Equipment case . 88 6.9.5 Terminal blocks . 89 6.9.6 Insulating materials of supply control and load swi
25、tches 89 6.9.7 Terminals 90 6.9.8 Requirements for current circuits . 92 6.10 Safety related electrical tests 99 6.10.1 Overview . 99 6.10.2 Test methods . 101 6.10.3 Testing of voltage circuits 104 6.10.4 Dielectric tests . 106 6.10.5 Electrical tests on current circuits of direct connected meters
26、without supply control switches (SCSs) 112 6.10.6 Electrical tests on current circuits of direct connected meters with SCSs . 113 6.10.7 Electrical tests on load control switches (LCSs) . 119 7 Protection against mechanical hazards 122 7.1 General . 122 7.2 Sharp edges . 122 7.3 Provisions for lifti
27、ng and carrying 123 8 Resistance to mechanical stresses 123 8.1 General . 123 8.2 Spring hammer test . 123 9 Protection against spread of fire 124 9.1 General . 124 9.2 Eliminating or reducing the sources of ignition within the equipment . 125 9.3 Containment of fire within the equipment, should it
28、occur 125 9.3.1 General . 125 9.3.2 Constructional requirements 126 9.4 Limited-energy circuit 126 9.5 Overcurrent protection 128 10 Equipment temperature limits and resistance to heat . 128 10.1 Surface temperature limits for protection against burns . 128 10.2 Temperature limits for terminals 129
29、10.3 Temperatures of internal parts 130 10.4 Temperature test 132 10.5 Resistance to heat 133 10.5.1 Non-metallic enclosures 133 10.5.2 Insulating materials . 134 11 Protection against penetration of dust and water . 134 12 Protection against liberated gases and substances explosion and implosion Ba
30、tteries and battery charging . 136 IEC 62052-31:2015 IEC 2015 5 13 Components and sub-assemblies 136 13.1 General . 136 13.2 Mains transformers tested outside equipment . 138 13.3 Printed wiring boards 138 13.4 Components bridging insulation 138 13.5 Circuits or components used as transient overvolt
31、age limiting devices 138 14 Hazards resulting from application Reasonably foreseeable misuse . 138 15 Risk assessment . 139 Annex A (normative) Measuring circuits for touch current 140 A.1 Measuring circuit for a.c. with frequencies up to 1 MHz and for d.c. 140 A.2 Measuring circuits for sinusoidal
32、a.c. with frequencies up to 100 Hz and for d.c. . 141 A.3 Current measuring circuit for electrical burns at high frequencies 141 A.4 Current measuring circuit for wet location . 142 Annex B (informative) Examples for insulation between parts 143 B.1 Insulation between parts Example 1 . 143 B.2 Insul
33、ation between parts Example 2 . 144 B.3 Insulation between parts Example 3 . 145 B.4 Insulation between parts Example 4 . 146 B.5 Insulation between parts Example 5 . 147 Annex C (informative) Examples for direct connected meters equipped with supply control and load control switches 149 Annex D (no
34、rmative) Test circuit diagram for the test of long term overvoltage withstand 151 Annex E (normative) Test circuit diagram for short current test on the current circuit of direct connected meters 152 Annex F (informative) Examples for voltage tests . 154 Annex G (normative) Additional a.c. voltage t
35、ests for electromechanical meters 158 Annex H (normative) Test equipment for cable flexion and pull test . 159 Annex I (informative) Routine tests 161 I.1 General . 161 I.2 Protective earth 161 I.3 AC power-frequency high-voltage test for mains-circuits . 161 I.4 Mains-circuits with voltage limiting
36、 devices . 161 Annex J (informative) Examples of battery protection . 162 Annex K (informative) Rationale for specifying overvoltage category III . 163 K.1 Transient overvoltage requirements in TC 13 standards 163 K.2 Electricity meters mentioned in basic safety publications and group safety publica
37、tions 163 K.2.1 IEC 60664-1 163 K.2.2 IEC 60364-4-44 . 164 K.2.3 IEC 61010-1 164 K.3 Conclusion 165 Annex L (informative) Overview of safety aspects covered . 166 Annex M (informative) Index of defined terms 181 Bibliography 184 6 IEC 62052-31:2015 IEC 2015 Figure 1 Measurements through openings in
38、enclosures 52 Figure 2 Maximum duration of short-term accessible voltages in single fault condition (see 6.3.3 a) . 54 Figure 3 Capacitance level versus voltage in normal condition and single fault condition (see 6.3.2 c) and 6.3.3 c) 55 Figure 4 Acceptable arrangements of protection means against e
39、lectric shock . 57 Figure 5 Examples of binding screw assemblies 59 Figure 6 Distance between conductors on an interface between two layers 72 Figure 7 Distance between adjacent conductors along an interface of an inner layer . 72 Figure 8 Distance between adjacent conductors located between the sam
40、e two layers 74 Figure 9 Example of recurring peak voltage . 82 Figure 10 Flowchart of safety related electrical tests 100 Figure 11 Flow chart to explain the requirements for protection against the spread of fire 125 Figure 12 Ball-pressure test apparatus. 134 Figure 13 Flow chart for conformity op
41、tions 13.1 a), b), c) and d) . 137 Figure A.1 Measuring circuit for a.c. with frequencies up to 1 MHz and for d.c. 140 Figure A.2 Measuring circuits for sinusoidal a.c. with frequencies up to 100 Hz and for d.c. 141 Figure A.3 Current measuring circuit for electrical burns 142 Figure A.4 Current mea
42、suring circuit for wet contact 142 Figure B.1 Insulation between parts Example 1 . 143 Figure B.2 Insulation between parts Example 2 . 144 Figure B.3 Insulation between parts Example 3 . 145 Figure B.4 Insulation between parts Example 4 . 146 Figure B.5 Insulation between parts Example 5 . 147 Figur
43、e C.1 Single phase two wire meter with UC2 SCS and 25A LCS 149 Figure C.2 Three phase four wire meter with UC2 SCS and 2A auxiliary control switch . 150 Figure D.1 Circuit for three-phase four-wire meters to simulate long term overvoltage, voltage moved to L3 151 Figure D.2 Voltages at the meter und
44、er test . 151 Figure E.1 Test circuit for verification of short-time withstand current test on current circuits with and without supply control switches . 152 Figure E.2 Example of short-circuit carrying test record in the case of a single-pole equipment on single-phase a.c. 153 Figure F.1 Test arra
45、ngement for voltage tests: 3 phase 4 wire direct connected meter with supply control and load control switches 154 Figure F.2 Test arrangement for voltage tests: 3 phase 4 wire transformer connected meter 156 Figure H.1 Test equipment for cable flexion and pull test (see 6.9.7.3) 159 Figure J.1 Non-
46、rechargeable battery protection 162 Figure J.2 Rechargeable battery protection 162 IEC 62052-31:2015 IEC 2015 7 Table 1 Test copper conductors for current and switch terminals . 35 Table 2 Information requirements . 40 Table 3 IEC 60417 symbols and ISO 7000 that may be used on metering equipment 42
47、Table 4 Tightening torque for binding screw assemblies 60 Table 5 Multiplication factors for clearance for altitudes up to 5 000 m . 64 Table 6 Overview of clauses specifying requirements and tests for insulations 67 Table 7 Nominal / rated voltages and rated impulse voltages . 68 Table 8 Clearances
48、 for mains-circuits 69 Table 9 Creepage distances for mains-circuits . 70 Table 10 Test voltages for solid insulation in mains-circuits . 71 Table 11 Test voltages for testing long-term stress of solid insulation in mains- circuits 71 Table 12 Minimum values for distance or thickness of solid insula
49、tion 73 Table 13 Clearances and test voltages for non-mains-circuits derived from mains- circuits of overvoltage category III 75 Table 14 Creepage distances for non-mains-circuits 75 Table 15 Minimum values for distance or thickness (see 6.7.4.4.2 to 6.7.4.4.4) 77 Table 16 Clearance values for the calculation of 6.7.5.2 80 Table 17 Test voltages based on clearances 81 Table 18 Clearances for basic insulati
