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eLibrary > BS EN IEC 62052-31:2024 - TC Tracked Changes. Electricity metering equipment. General requirements, tests and test conditions - Product safety requirements and tests >

BS EN IEC 62052-31:2024 - TC Tracked Changes. Electricity metering equipment. General requirements, tests and test conditions - Product safety requirements and tests, 2024

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BS EN IEC 62052-31:2024 - TC Tracked Changes. Electricity metering equipment. General requirements, tests and test conditions - Product safety requirements and tests, 2024

A-30394506.pdf [Go to Page]
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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope [Go to Page]
1.1 General
1.2 Aspects included in scope
1.3 Aspects excluded from scope
1.4 Verification
1.5 Environmental conditions [Go to Page]
1.5.1 Normal environmental conditions
1.5.2 Extended environmental conditions
1.5.3 Extreme environmental conditions
2 Normative references
3 Terms and definitions [Go to Page]
3.1 Equipment and states of equipment
3.2 Parts, accessories, and functional elements
3.3 Quantities
3.4 Tests
3.5 Safety terms
3.6 Insulation
3.7 Terms related to switches of metering equipment
4 Tests [Go to Page]
4.1 General
4.2 Type test – sequence of tests
4.3 Reference test conditions [Go to Page]
4.3.1 Atmospheric conditions
4.3.2 State of the equipment
Tables [Go to Page]
Table 1 – Test copper conductors for current and switch terminals
4.4 Testing in single fault condition [Go to Page]
4.4.1 General
4.4.2 Application of fault conditions
4.4.3 Duration of tests
4.4.4 Conformity after application of fault conditions
5 Information and marking requirements [Go to Page]
5.1 General
Table 2 – Information requirements
5.2 Labels, signs and signals [Go to Page]
5.2.1 General
Table 3 – IEC 60417-DB-12M and ISO 7000:2019 symbols that may be used on metering equipment [Go to Page]
5.2.2 Durability of markings
5.3 Information for selection [Go to Page]
5.3.1 General
5.3.2 General information
5.3.3 Information specific for meters
5.3.4 Information specific for stand-alone tariff and load control equipment
5.3.5 Information related to LCS
5.4 General information for installation and commissioning [Go to Page]
5.4.1 General
5.4.2 Handling and mounting
5.4.3 Enclosure
5.4.4 Connections
5.4.5 Auxiliary power supply
5.4.6 Supply for external devices
5.4.7 Self-consumption
5.4.8 Commissioning
5.5 General information for use [Go to Page]
5.5.1 General
5.5.2 Display, push buttons and other controls
5.5.3 Switches
5.5.4 Connection to user's equipment
5.6 General information for maintenance [Go to Page]
5.6.1 Maintenance instructions
5.6.2 Cleaning
5.6.3 Batteries
6 Protection against electrical shock [Go to Page]
6.1 General requirements
6.2 Determination of accessible parts [Go to Page]
6.2.1 General
6.2.2 Examination
6.2.3 Openings above parts that are hazardous live
6.2.4 Openings for pre-set controls
6.2.5 Wiring terminals
Figures [Go to Page]
Figure 1 – Measurements through openings in enclosures
6.3 Limit values for accessible parts [Go to Page]
6.3.1 General
6.3.2 Levels in normal condition
6.3.3 Levels in single fault condition
Figure 2 – Capacitance level versus voltage in normal condition and single fault condition (see 6.3.2c) and 6.3.3c))
6.4 Primary means of protection (protection against direct contact) [Go to Page]
6.4.1 General
Figure 3 – Maximum duration of short-term accessible voltages in single fault condition (see 6.3.3a)) [Go to Page]
6.4.2 Equipment case
6.4.3 Basic insulation
6.4.4 Impedance
6.5 Additional means of protection in case of single fault conditions (protection against indirect contact) [Go to Page]
6.5.1 General
6.5.2 Protective bonding
Figure 4 – Acceptable arrangements of protection means against electric shock
Figure 5 – Examples of binding screw assemblies [Go to Page]
6.5.3 Supplementary insulation and reinforced insulation
Table 4 – Tightening torque for binding screw assemblies [Go to Page]
6.5.4 Protective impedance
6.5.5 Automatic disconnection of the supply
6.5.6 Current- or voltage-limiting device
6.6 Connection to external circuits [Go to Page]
6.6.1 General
6.6.2 Terminals for external circuits
6.6.3 Terminals for stranded conductors
6.7 Insulation requirements [Go to Page]
6.7.1 General – electric stresses, overvoltages and working voltages
6.7.2 The nature of insulation
Table 5 – Multiplication factors for clearance for altitudes up to 5 000 m [Go to Page]
6.7.3 Insulation requirements for mains circuits
Table 6 – Overview of clauses specifying requirements for insulations
Table 7 – Nominal / rated voltages and rated impulse voltages
Table 8 – Clearances for mains circuits
Table 9 – Creepage distances for mains circuits
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
Figure 6 – Distance between conductors on an interface between two layers
Figure 7 – Distance between adjacent conductors along an interface of an inner layer
Table 12 – Minimum values for distance or thickness of solid insulation in mains circuits [Go to Page]
6.7.4 Insulation requirements for non-mains circuits
Figure 8 – Distance between adjacent conductors located between the same two layers
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 and functional insulation
Table 15 – Minimum values for distance or thickness (see 6.7.4.4.2 to 6.7.4.4.4) [Go to Page]
6.7.5 Insulation in circuits with special voltage values not addressed in 6.7.3 or 6.7.4
Table 16 – Clearance values for the calculation of 6.7.5.2
Table 17 – Test voltages based on clearances
Figure 9 – Example of recurring peak voltage
Table 18 – Clearances for basic insulation in circuits having recurring peak voltages [Go to Page]
6.7.6 Reduction of transient overvoltages by the use of overvoltage limiting devices
6.7.7 Insulation requirements between circuits and parts
Table 19 – Isolation classes for non-mains circuits
Table 20 – Insulation requirements between circuits
6.8 Constructional requirements for protection against electric shock [Go to Page]
6.8.1 General
6.8.2 Insulating materials
6.8.3 Color coding
6.8.4 Equipment case
6.8.5 Terminal blocks
6.8.6 Insulating materials of SCS and LCS
6.8.7 Terminals
6.8.8 Requirements for current circuits
Table 21 – Summary of requirements for current circuits of directly connected meters without SCS
Table 22 – Summary of requirements for current circuits of directly connected meters with SCS
Table 23 – Summary of requirements for LCS
6.9 Safety related electrical tests [Go to Page]
6.9.1 Overview
Figure 10 – Flowchart of safety related electrical tests – part 1 [Go to Page]
6.9.2 Test conditions
Figure 11 – Flowchart of safety related electrical tests – part 2
Table 24 – Correction factors according to test site altitude for test voltages for clearances [Go to Page]
6.9.3 Dielectric test methods
6.9.4 Dielectric testing on complete equipment
Table 25 – AC voltage test
Table 26 – DC voltage test [Go to Page]
6.9.5 Dielectric tests on sub-assemblies
Table 27 – Voltage tests for verification of clearance in mains circuits
Table 28 – Voltage tests for verification of clearance in non-mains circuits
Table 29 – Voltage tests for verification of clearance in circuits with special voltage values
Table 30 – Voltage tests for verification of solid insulation in mains circuits
Table 31 – Voltage tests for verification of solid insulation in non-mains circuits
Table 32 – Voltage tests for verification of solid insulation in circuits with special voltage values [Go to Page]
6.9.6 Electrical tests on current circuits of directly connected meters without SCS
6.9.7 Electrical tests on current circuits of directly connected meters with SCS
Table 33 – Test sequence and sample plan for SCS
Table 34 – Power factor ranges of the test circuit [Go to Page]
6.9.8 Electrical tests on LCS
Table 35 – Test sequence and sample plan for LCS [Go to Page]
6.9.9 Cemented joints test
6.9.10 Thermal cycling
7 Protection against mechanical hazards [Go to Page]
7.1 General
7.2 Sharp edges
7.3 Provisions for lifting and carrying
7.4 Wall mounting
8 Resistance to mechanical stresses [Go to Page]
8.1 General
8.2 Spring hammer test
9 Protection against spread of fire [Go to Page]
9.1 General
9.2 Eliminating or reducing the sources of ignition within the equipment
9.3 Containment of fire within the equipment, should it occur [Go to Page]
9.3.1 General
Figure 12 – Flowchart to explain the requirements for protection against the spread of fire [Go to Page]
9.3.2 Construction requirements
9.4 Limited-energy circuit
Table 36 – Limits for power sources without an overcurrent protective device
9.5 Overcurrent protection
10 Equipment temperature limits and resistance to heat [Go to Page]
10.1 Surface temperature limits for protection against burns
Table 37 – Limits for power sources with an overcurrent protection device
10.2 Temperature limits for terminals
Table 38 – Surface temperature limits in normal condition
10.3 Temperatures of internal parts
Table 39 – Temperature limits for terminals
Table 40 – Maximum measured temperatures for internal materials and components
10.4 Temperature test
10.5 Resistance to heat [Go to Page]
10.5.1 Non-metallic enclosures
10.5.2 Insulating materials
11 Protection against penetration of dust and water
12 Protection against liberated gases and substances explosion and implosion [Go to Page]
12.1 Batteries and battery charging [Go to Page]
12.1.1 Mounting of batteries
12.1.2 Battery circuits
12.1.3 Tests related to batteries and charging circuits
13 Components and sub-assemblies [Go to Page]
13.1 General
13.2 Mains transformers tested outside equipment
13.3 Printed wiring boards
Figure 13 – Flowchart for conformity options 13.1 a), b), c) and d)
13.4 Components bridging insulation
13.5 Surge protective devices (SPDs, transient overvoltage limiting circuits) [Go to Page]
13.5.1 General use of SPDs
13.5.2 SPD overheating test
13.6 Capacitors
14 Hazards resulting from application – Reasonably foreseeable misuse
15 Risk assessment
Annex A (normative) Measuring circuits for touch current [Go to Page]
A.1 Measuring circuit for AC with frequencies up to 1 MHz and for DC
Figure A.1 – Measuring circuit for AC with frequencies up to 1 MHz and for DC
A.2 Measuring circuits for sinusoidal AC with frequencies up to 100 Hz and for DC
A.3 Current measuring circuit for electrical burns at high frequencies
Figure A.2 – Measuring circuits for sinusoidal AC with frequencies up to 100 Hz and for DC
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 location
Annex B (informative) Examples for insulation between parts [Go to Page]
B.1 General
B.2 Example of a meter protected by reinforced insulation
Figure B.1 – Insulation between parts – example of a meter protected by reinforced insulation
B.3 Example of a meter protected by double insulation
Figure B.2 – Insulation between parts – example of a meter protected by double insulation
Annex C (informative) Examples for directly connected meters equipped with SCS and LCS [Go to Page]
Figure C.1 – Single phase two wire meter with UC2 SCS and 25A LCS
Figure C.2 – Three phase four wire meter with UC2 SCS and 2A ACS
Annex D (normative) Test circuit diagram for the test of long-term overvoltage withstand [Go to Page]
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
Annex E (normative) Test circuit diagram for short current test onthe current circuit of directly connected meters [Go to Page]
Figure E.1 – Test circuit for verification of short-time withst and currenttest on current circuits with and without SCS (meter example is with SCS)
Figure E.2 – Example of short-circuit carrying test record in the case of a single-pole equipment on single-phase AC
Annex F (informative) Examples of voltage tests [Go to Page]
F.1 General
F.2 Example of a directly connected meter with SCS
Figure F.1 – Example terminal arrangement of a directly connected meter with SCS
Table F.1 – Application of impulse test voltages according to 6.9.4.4
Table F.2 – Application of AC power frequency test voltages according to 6.9.4.5 or DC test voltages according to 6.9.4.6
Table F.3 – Application of AC long-term overvoltage test voltages according to 6.9.4.3.2
Table F.4 – Application of surge test voltages according to 6.9.4.7
F.3 Example of a transformer operated meter with auxiliary power supply
Figure F.2 – Example terminal arrangement of a transformer operated meter with auxiliary power supply
Table F.5 – Application of impulse test voltages according to 6.9.4.4
Table F.6 – Application of AC power frequency test voltages according to 6.9.4.5 or DC test voltages according to 6.9.4.6
Table F.7 – Application of AC long-term overvoltage test voltages according to 6.9.4.3.2
Table F.8 – Application of surge test voltages according to 6.9.4.7
F.4 Example of an LPCT-operated meter with direct voltage connections
Figure F.3 – Example terminal arrangement of a LPCT-operated meter with direct voltage connections
Table F.9 – Application of impulse test voltages according to 6.9.4.4
Table F.10 – Application of AC power frequency test voltages according to 6.9.4.5 or DC test voltages according to 6.9.4.6
Table F.11 – Application of AC long-term overvoltage test voltages according to 6.9.4.3.2
Table F.12 – Application of surge test voltages according to 6.9.4.7
Annex G (normative) Additional AC voltage tests for electromechanical meters [Go to Page]
Table G.1 – AC voltage tests of electromechanical meters
Annex H (normative) Test equipment for cable flexion and pull test [Go to Page]
Figure H.1 – Test equipment for cable flexion and pull test (see 6.8.7.3)
Table H.1 – Test values for flexion and pull-out tests for round copper conductors
Annex I (normative) Routine tests [Go to Page]
I.1 General
I.2 Protective earth
I.3 High-voltage test for mains circuits
I.4 Mains circuits with voltage-limiting devices
Annex J (informative) Examples of battery protection [Go to Page]
Figure J.1 – Non-rechargeable battery protection
Figure J.2 – Rechargeable battery protection
Annex K (informative) Transient overvoltage requirements in TC 13 standards
Annex L (informative) Electricity meters in LVDC systems [Go to Page]
Figure L.1 – Unipolar, balanced and bipolar DC systems
Table L.1 – Voltage between lines (unipolar systems) or line and midpoint (bipolar systems) for installation domain
Table L.2 – Voltage between lines (unipolar systems) or line and midpoint (bipolar systems) for distribution domain
Annex M (informative) Component standards
Bibliography [Go to Page]

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