BS EN 62052-31:2016
$256.21
Electricity metering equipment (AC). General requirements, tests and test conditions – Product safety requirements and tests
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 204 |
This part of IEC 62052 specifies product safety requirements for equipment for electrical energy measurement and control.
NOTE 1 For other requirements, see the relevant standards.
This International Standard applies to newly manufactured metering equipment designed to measure and control electrical energy on 50 Hz or 60 Hz networks with a voltage up to 600 V, where all functional elements, including add-on modules are enclosed in or form a single case.
NOTE 2 The voltage mentioned above is the voltage line-to-neutral derived from nominal voltages. See Table 7.
This International Standard also applies to metering equipment containing supply and load control switches, but only those which are electromechanical in operation.
NOTE 3 For components and sub-assemblies, see Clause 13.
When such equipment is designed to be installed in a specified matching socket, then the requirements apply to, and the tests shall be performed on, equipment installed in its specified matching socket. However, requirements for sockets and inserting / removing the meters from the socket are outside the scope of this standard.
This International Standard is also applicable to auxiliary input and output circuits.
NOTE 4 Examples are impulse inputs and outputs, control inputs and outputs, circuits for meter data exchange.
In this standard distinction is made between:
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electromechanical meters, static meters and equipment for tariff and load control;
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direct connected, current transformer operated, voltage and current transformer operated meters;
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protective class I and protective class II equipment;
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wall or cabinet mounted, rack mounted and panel mounted equipment;
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equipment intended for indoor use and outdoor use.
Equipment used in conjunction with equipment for electrical energy measurement and control may need to comply with additional safety requirements. See also Clause 13.
NOTE 5 Examples are telecommunication modems and customer information units.
This International Standard does not apply to:
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equipment where the voltage line-to-neutral derived from nominal voltages exceeds 600 V;
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portable meters;
NOTE 6 Portable meters are meters that are not permanently connected
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laboratory and mobile meter test equipment;
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reference standard meters.
The safety requirements of this standard are based on the following assumptions:
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metering equipment has been installed correctly;
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metering equipment is used generally by unskilled persons, including meter readers and consumers of electrical energy. In many cases, it is installed in a way that it is freely accessible. Its terminal covers cannot be removed and its case cannot be opened without removing seals and using a tool;
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during normal use all terminal covers, covers and barriers providing protection against accessing hazardous live parts are in place;
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for installation, configuration, maintenance and repair it may be necessary to remove terminal cover(s), (a part of) the case or barriers so that hazardous live parts may become accessible. Such activities are performed by skilled personnel, who have been suitably trained to be aware of working procedures necessary to ensure safety. Therefore, safety requirements covering these conditions are out of the Scope of this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | European foreword Endorsement notice |
| 7 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 10 | CONTENTS |
| 16 | FOREWORD |
| 18 | INTRODUCTION |
| 20 | 1 Scope and object 1.1 Scope |
| 21 | 1.2 Object 1.2.1 Aspects included in scope 1.2.2 Aspects excluded from scope |
| 22 | 1.3 Verification 1.4 Environmental conditions 1.4.1 Normal environmental conditions 1.4.2 Extended environmental conditions |
| 23 | 1.4.3 Extreme environmental conditions 2 Normative references |
| 24 | 3 Terms and definitions 3.1 Equipment and states of equipment |
| 25 | 3.2 Parts and accessories |
| 27 | 3.3 Quantities |
| 29 | 3.4 Tests 3.5 Safety terms |
| 33 | 3.6 Insulation |
| 37 | 3.7 Terms related to switches of metering equipment |
| 39 | 4 Tests 4.1 General 4.2 Type test – sequence of tests |
| 40 | 4.3 Reference test conditions 4.3.1 Atmospheric conditions 4.3.2 State of the equipment |
| 43 | Tables Table 1 – Test copper conductors for current and switch terminals |
| 44 | 4.4 Testing in single fault condition 4.4.1 General 4.4.2 Application of fault conditions |
| 46 | 4.4.3 Duration of tests 4.4.4 Conformity after application of fault conditions |
| 47 | 5 Information and marking requirements 5.1 General |
| 48 | Table 2 – Information requirements |
| 49 | 5.2 Labels, signs and signals 5.2.1 General |
| 50 | Table 3 – IEC 60417 symbols and ISO 7000 that may be used on metering equipment |
| 51 | 5.2.2 Durability of markings 5.3 Information for selection 5.3.1 General 5.3.2 General information |
| 52 | 5.3.3 Information related to meters / metering elements 5.3.4 Information related to stand-alone tariff-and load control equipment 5.3.5 Information related to supply control and load control switches 5.4 Information for installation and commissioning 5.4.1 General |
| 53 | 5.4.2 Handling and mounting 5.4.3 Enclosure 5.4.4 Connection |
| 55 | 5.4.5 Protection |
| 56 | 5.4.6 Auxiliary power supply 5.4.7 Supply for external devices 5.4.8 Batteries 5.4.9 Self-consumption |
| 57 | 5.4.10 Commissioning 5.5 Information for use 5.5.1 General 5.5.2 Display, push buttons and other controls 5.5.3 Switches |
| 58 | 5.5.4 Connection to user’s equipment 5.5.5 External protection devices 5.5.6 Cleaning 5.6 Information for maintenance 6 Protection against electrical shock 6.1 General requirements |
| 59 | 6.2 Determination of accessible parts 6.2.1 General 6.2.2 Examination |
| 60 | 6.2.3 Openings above parts that are hazardous live 6.2.4 Openings for pre-set controls Figures Figure 1 – Measurements through openings in enclosures |
| 61 | 6.2.5 Wiring terminals 6.3 Limit values for accessible parts 6.3.1 General 6.3.2 Levels in normal condition 6.3.3 Levels in single fault condition |
| 62 | Figure 2 – Maximum duration of short-term accessible voltages in single fault condition (see 6.3.3 a)) |
| 63 | Figure 3 – Capacitance level versus voltage in normal condition and single fault condition (see 6.3.2 c) and 6.3.3 c)) |
| 64 | 6.4 Primary means of protection (protection against direct contact) 6.4.1 General 6.4.2 Equipment case 6.4.3 Basic insulation 6.4.4 Impedance |
| 65 | 6.5 Additional means of protection in case of single fault conditions (protection against indirect contact) 6.5.1 General 6.5.2 Protective bonding Figure 4 – Acceptable arrangements of protection means against electric shock |
| 67 | Figure 5 – Examples of binding screw assemblies |
| 68 | Table 4 – Tightening torque for binding screw assemblies |
| 69 | 6.5.3 Supplementary insulation and reinforced insulation 6.5.4 Protective impedance 6.5.5 Automatic disconnection of the supply |
| 70 | 6.5.6 Current- or voltage-limiting device 6.6 Connection to external circuits 6.6.1 General |
| 71 | 6.6.2 Terminals for external circuits 6.6.3 Terminals for stranded conductors 6.7 Insulation requirements 6.7.1 General – Electrical stresses, overvoltages and overvoltage categories |
| 72 | 6.7.2 The nature of insulation Table 5 – Multiplication factors for clearance for altitudes up to 5 000 m |
| 75 | Table 6 – Overview of clauses specifying requirements and tests for insulations |
| 76 | 6.7.3 Insulation requirements for mains-circuits Table 7 – Nominal / rated voltages and rated impulse voltages |
| 77 | Table 8 – Clearances for mains-circuits |
| 78 | Table 9 – Creepage distances for mains-circuits |
| 79 | Table 10 – Test voltages for solid insulation in mains-circuits Table 11 – Test voltages for testing long-term stress of solid insulation in mains-circuits |
| 80 | Figure 6 – Distance between conductors on an interface between two layers Figure 7 – Distance between adjacent conductors along an interface of an inner layer |
| 81 | Table 12 – Minimum values for distance or thickness of solid insulation |
| 82 | 6.7.4 Insulation requirements for non-mains-circuits Figure 8 – Distance between adjacent conductors located between the same two layers |
| 83 | Table 13 – Clearances and test voltages for non-mains-circuits derived from mains-circuits of overvoltage category III Table 14 – Creepage distances for non-mains-circuits |
| 85 | Table 15 – Minimum values for distance or thickness (see 6.7.4.4.2 to 6.7.4.4.4) |
| 86 | 6.7.5 Insulation in circuits not addressed in 0 or 6.7.4 |
| 88 | Table 16 – Clearance values for the calculation of 6.7.5.2 |
| 89 | Table 17 – Test voltages based on clearances |
| 90 | Figure 9 – Example of recurring peak voltage |
| 91 | Table 18 – Clearances for basic insulation in circuits having recurring peak voltages |
| 92 | 6.7.6 Reduction of transient overvoltages by the use of overvoltage limiting devices 6.8 Insulation requirements between circuits and parts |
| 93 | Table 19 – Isolation classes for non-mains-circuits |
| 94 | Table 20 – Insulation requirements between any two circuits |
| 96 | 6.9 Constructional requirements for protection against electric shock 6.9.1 General 6.9.2 Insulating materials 6.9.3 Colour coding 6.9.4 Equipment case |
| 97 | 6.9.5 Terminal blocks 6.9.6 Insulating materials of supply control and load switches |
| 98 | 6.9.7 Terminals |
| 100 | 6.9.8 Requirements for current circuits |
| 103 | Table 21 – Summary of requirements for current circuits of direct connected meters without SCS |
| 104 | Table 22 – Summary of requirements for current circuits of direct connected meters with SCS |
| 106 | Table 23 – Summary of requirements for load control switches |
| 107 | 6.10 Safety related electrical tests 6.10.1 Overview |
| 108 | Figure 10 – Flowchart of safety related electrical tests |
| 109 | 6.10.2 Test methods |
| 112 | 6.10.3 Testing of voltage circuits Table 24 – Correction factors according to test site altitude for test voltages for clearances |
| 114 | 6.10.4 Dielectric tests |
| 117 | Table 25 – AC voltage test |
| 120 | 6.10.5 Electrical tests on current circuits of direct connected meters without supply control switches (SCSs) |
| 121 | 6.10.6 Electrical tests on current circuits of direct connected meters with SCSs Table 26 – Test sequence and sample plan for supply control switches |
| 124 | Table 27 – Power factor ranges of the test circuit |
| 127 | 6.10.7 Electrical tests on load control switches (LCSs) |
| 128 | Table 28 – Test sequence and sample plan for load control switches |
| 130 | 7 Protection against mechanical hazards 7.1 General 7.2 Sharp edges |
| 131 | 7.3 Provisions for lifting and carrying 8 Resistance to mechanical stresses 8.1 General 8.2 Spring hammer test |
| 132 | 9 Protection against spread of fire 9.1 General |
| 133 | 9.2 Eliminating or reducing the sources of ignition within the equipment 9.3 Containment of fire within the equipment, should it occur 9.3.1 General Figure 11 – Flow chart to explain the requirements for protection against the spread of fire |
| 134 | 9.3.2 Constructional requirements 9.4 Limited-energy circuit |
| 135 | Table 29 – Limits of maximum available current Table 30 – Values for overcurrent protection devices |
| 136 | 9.5 Overcurrent protection 10 Equipment temperature limits and resistance to heat 10.1 Surface temperature limits for protection against burns |
| 137 | 10.2 Temperature limits for terminals Table 31 – Surface temperature limits in normal condition |
| 138 | 10.3 Temperatures of internal parts Table 32 – Temperature limits for terminals |
| 139 | Table 33 – Maximum measured total temperatures for internal materials and components |
| 140 | 10.4 Temperature test |
| 141 | 10.5 Resistance to heat 10.5.1 Non-metallic enclosures |
| 142 | 10.5.2 Insulating materials 11 Protection against penetration of dust and water Figure 12 – Ball-pressure test apparatus |
| 144 | 12 Protection against liberated gases and substances explosion and implosion – Batteries and battery charging 13 Components and sub-assemblies 13.1 General |
| 145 | Figure 13 – Flow chart for conformity options 13.1 a), b), c) and d) |
| 146 | 13.2 Mains transformers tested outside equipment 13.3 Printed wiring boards 13.4 Components bridging insulation 13.5 Circuits or components used as transient overvoltage limiting devices 14 Hazards resulting from application – Reasonably foreseeable misuse |
| 147 | 15 Risk assessment |
| 148 | Annexes Annex A (normative) Measuring circuits for touch current A.1 Measuring circuit for a.c. with frequencies up to 1 MHz and for d.c. Figure A.1 – Measuring circuit for a.c. with frequencies up to 1 MHz and for d.c. |
| 149 | A.2 Measuring circuits for sinusoidal a.c. with frequencies up to 100 Hz and for d.c. A.3 Current measuring circuit for electrical burns at high frequencies Figure A.2 – Measuring circuits for sinusoidal a.c. with frequencies up to 100 Hz and for d.c. |
| 150 | A.4 Current measuring circuit for wet location Figure A.3 – Current measuring circuit for electrical burns Figure A.4 – Current measuring circuit for wet contact |
| 151 | Annex B (informative) Examples for insulation between parts B.1 Insulation between parts – Example 1 Figure B.1 – Insulation between parts – Example 1 |
| 152 | B.2 Insulation between parts – Example 2 Figure B.2 – Insulation between parts – Example 2 |
| 153 | B.3 Insulation between parts – Example 3 Figure B.3 – Insulation between parts – Example 3 |
| 154 | B.4 Insulation between parts – Example 4 Figure B.4 – Insulation between parts – Example 4 |
| 155 | B.5 Insulation between parts – Example 5 Figure B.5 – Insulation between parts – Example 5 |
| 157 | Annex C (informative) Examples for direct connected meters equipped with supply control and load control switches Figure C.1 – Single phase two wire meter with UC2 SCS and 25A LCS |
| 158 | Figure C.2 – Three phase four wire meter with UC2 SCS and 2A auxiliary control switch |
| 159 | Annex D (normative) Test circuit diagram for the test of long term overvoltage withstand Figure D.1 – Circuit for three-phase four-wire meters to simulate long term overvoltage, voltage moved to L3 Figure D.2 – Voltages at the meter under test |
| 160 | Annex E (normative) Test circuit diagram for short current test on the current circuit of direct connected meters Figure E.1 – Test circuit for verification of short-time withstand currenttest on current circuits with and without supply control switches |
| 161 | Figure E.2 – Example of short-circuit carrying test record in the case of a single-pole equipment on single-phase a.c. |
| 162 | Annex F (informative) Examples for voltage tests Figure F.1 – Test arrangement for voltage tests: 3 phase 4 wire direct connected meter with supply control and load control switches |
| 164 | Figure F.2 – Test arrangement for voltage tests: 3 phase 4 wire transformer connected meter |
| 166 | Annex G (normative) Additional a.c. voltage tests for electromechanical meters Table G.1 – AC voltage tests of electromechanical meters |
| 167 | Annex H (normative) Test equipment for cable flexion and pull test Figure H.1 – Test equipment for cable flexion and pull test (see 6.9.7.3) |
| 168 | Table H.1 – Test values for flexion and pull-out tests for round copper conductors |
| 169 | Annex I (informative) Routine tests I.1 General I.2 Protective earth I.3 AC power-frequency high-voltage test for mains-circuits I.4 Mains-circuits with voltage limiting devices |
| 170 | Annex J (informative) Examples of battery protection Figure J.1 – Non-rechargeable battery protection Figure J.2 – Rechargeable battery protection |
| 171 | Annex K (informative) Rationale for specifying overvoltage category III K.1 Transient overvoltage requirements in TC 13 standards K.2 Electricity meters mentioned in basic safety publications and group safety publications K.2.1 IEC 60664-1 |
| 172 | K.2.2 IEC 60364-4-44 K.2.3 IEC 61010-1 |
| 173 | K.3 Conclusion |
| 174 | Annex L (informative) Overview of safety aspects covered Table L.1 – Overview of safety aspects |
| 189 | Annex M (informative) Index of defined terms |
| 192 | Bibliography |
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