SIST EN 62052-31:2016

SLOVENSKI STANDARD
01-september-2016
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Electricity metering equipment (AC) - General requirements, tests and test conditions -
Part 31: Safety requirements and tests
Ta slovenski standard je istoveten z: EN 62052-31:2016
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62052-31

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2016
ICS 19.080; 91.140.50
English Version
Electricity metering equipment (AC) -
General requirements, tests and test conditions -
Part 31: Product safety requirements and tests
(IEC 62052-31:2015)
Equipement de comptage de l'électricité (CA) -  Wechselstrom-Elektrizitätszähler -
Exigences générales, essais et conditions d'essai - Allgemeine Anforderungen, Prüfungen und Prüfbedingungen -
Partie 31 : Exigences et essais sur la sécurité de produit Teil 31: Sicherheitsanforderungen und Prüfungen
(IEC 62052-31:2015) (IEC 62052-31:2015)
This European Standard was approved by CENELEC on 2015-10-20. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62052-31:2016 E
European foreword
The text of document 13/1639/FDIS, future edition 1 of IEC 62052-31, prepared by IEC/TC 13
"Electrical energy measurement and control" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62052-31:2016.
The following dates are fixed:
(dop) 2016-12-17
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2019-06-17
• latest date by which the national standards conflicting with
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62052-31:2015 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60038 NOTE Harmonized as EN 60038.
IEC 60060-1:2010 NOTE Harmonized as EN 60060-1:2010 (not modified).
IEC 60065 NOTE Harmonized as EN 60065.
IEC 60068-1:2013 NOTE Harmonized as EN 60068-1:2014 (not modified).
IEC 60071-1 NOTE Harmonized as EN 60071-1.
IEC 60079-0 NOTE Harmonized as EN 60079-0.
IEC 60228 NOTE Harmonized as EN 60228.
IEC 60255-27:2013 NOTE Harmonized as EN 60255-27:2014 (not modified).
IEC 60269-1 NOTE Harmonized as EN 60269-1.
IEC 60335-1 NOTE Harmonized as EN 60335-1.
IEC 60364-1:2005 NOTE Harmonized as HD 60364-1:2008 (modified).
IEC 60364-4-41 NOTE Harmonized as HD 60364-4-41.
IEC 60364-5-52 NOTE Harmonized as HD 60364-5-52.
IEC 60664-3:2003 NOTE Harmonized as EN 60664-3:2003 (not modified) and
Amd 1:2010 as EN 60664-3:2003/A1:2010 (not modified).
IEC 60688:2012 NOTE Harmonized as EN 60688:2013 (not modified).
IEC 60721-3-0:1984 NOTE Harmonized as EN 60721-3-0:1993 (not modified).
Amd 1:1987
IEC 60721-3-3:1994 NOTE Harmonized as EN 60721-3-3:1995 (not modified) and
Amd 2:1997 as EN 60721-3-3:1995/A2:1997 (not modified)
IEC 60947-1:2007, NOTE Harmonized as EN 60947-1:2007 (not modified),
Amd 1:2010 as EN 60947-1:2007/A1:2011 (not modified) and
Amd 2:2014 as EN 60947-1:2007/A2:2014 (not modified).
IEC 60990 NOTE Harmonized as EN 60990.
IEC 61008-1 NOTE Harmonized as EN 61008-1.
IEC 61000-4-5:2014 NOTE Harmonized as EN 61000-4-5:2014 (not modified).
IEC 61010-1:2010 NOTE Harmonized as EN 61010-1:2010 (not modified).
IEC 61030-2-030 NOTE Harmonized as EN 61030-2-030.
IEC 61140 NOTE Harmonized as EN 61140.
IEC 61180-1:1992 NOTE Harmonized as EN 61180-1:1994 (not modified).
IEC 61558-1 NOTE Harmonized as EN 61558-1.
IEC 61558-2-16 NOTE Harmonized as EN 61558-2-16.
IEC 61643-12 NOTE Harmonized as CLC/TS 61643-12.
IEC 61869-3 NOTE Harmonized as EN 61869-3.
IEC 62052-11:2003 NOTE Harmonized as EN 62052-11:2003 (not modified).
IEC 62052-21:2004 NOTE Harmonized as EN 62052-21:2004 (not modified).
IEC 62053-11:2003 NOTE Harmonized as EN 62053-11:2003 (not modified).
IEC 62053-21:2003 NOTE Harmonized as EN 62053-21:2003 (not modified).
IEC 62053-22:2003 NOTE Harmonized as EN 62053-22:2003 (not modified).
IEC 62053-23:2003 NOTE Harmonized as EN 62053-23:2003 (not modified).
IEC 62053-24:2014 NOTE Harmonized as EN 62053-24:2015 (not modified).
IEC 62053-31:1998 NOTE Harmonized as EN 62053-31:1998 (not modified).
IEC 62054-11:2004 NOTE Harmonized as EN 62054-11:2004 (not modified).
IEC 62054-21:2004 NOTE Harmonized as EN 62054-21:2004 (not modified).
IEC 62055-31:2005 NOTE Harmonized as EN 62055-31:2005 (not modified).
IEC 62058-11:2008 NOTE Harmonized as EN 62058-11:2010 (modified).
IEC 62058-21:2008 NOTE Harmonized as EN 62058-21:2010 (modified).
IEC 62058-31:2008 NOTE Harmonized as EN 62058-31:2010 (modified).
IEC 62477-1:2012 NOTE Harmonized as EN 62477-1:2012 (not modified).
ISO 780 NOTE Harmonized as EN ISO 780.
ISO 7010 NOTE Harmonized as EN ISO 7010.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60027-1 -  Letter symbols to be used in electrical EN 60027-1 -
technology -
Part 1: General
IEC 60068-2-75 2014 Environmental testing - EN 60068-2-75 2014
Part 2-75: Tests - Test Eh: Hammer
tests
IEC 60068-2-78 -  Environmental testing - EN 60068-2-78 -
Part 2-78: Tests - Test Cab: Damp
heat, steady state
IEC 60085 -  Electrical insulation - Thermal EN 60085 -
evaluation and designation
IEC 60112 -  Method for the determination of the EN 60112 -
proof and the comparative tracking
indices of solid insulating materials
IEC 60269-3 -  Low-voltage fuses - HD 60269-3 -
Part 3: Supplementary requirements
for fuses for use by unskilled persons
(fuses mainly for household or similar
applications) - Examples of
standardized systems of fuses A to F
IEC 60332-1-2 2004 Tests on electric and optical fibre EN 60332-1-2 2004
cables under fire conditions -
1)
- - + A11 2016
Part 1-2: Test for vertical flame
propagation for a single insulated wire
or cable - Procedure for 1 kW pre-
mixed flame
1) To be published.
Publication Year Title EN/HD Year
IEC 60332-2-2 2004 Tests on electric and optical fibre EN 60332-2-2 2004
cables under fire conditions -
Part 2-2: Test for vertical flame
propagation for a single small
insulated wire or cable - Procedure for
diffusion flame
IEC 60364-4-44 (mod) 2007 Low-voltage electrical installations - HD 60364-4-442 2012
Part 4-442: Protection for safety -
Protection of low-voltage installations
against temporary overvoltages due
to earth faults in the high-voltage
system and due to faults in the low
voltage system
IEC 60364-4-44 (mod) 2007 Low-voltage electrical installations - HD 60364-4-444 2010
Part 4-444: Protection for safety -
Protection against voltage
disturbances and electromagnetic
disturbances
IEC 60417-DB -  Graphical symbols for use on - -
equipment
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- -  + corrigendum May 1993
+ A1 1999 + A1 2000
+ A2 2013 + A2 2013
IEC 60617-DB -  Graphical symbols for diagrams - -
IEC 60664-1 2007 Insulation coordination for equipment EN 60664-1 2007
within low-voltage systems -
Part 1: Principles, requirements and
tests
IEC 60695-2-11 -  Fire hazard testing - EN 60695-2-11 -
Part 2-11: Glowing/hot-wire based
test methods - Glow-wire flammability
test method for end-products
(GWEPT)
IEC 60695-10-2 -  Fire hazard testing - EN 60695-10-2 -
Part 10-2: Abnormal heat - Ball
pressure test method
IEC 60695-11-10 -  Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W
horizontal and vertical flame test
methods
IEC 60950-1 (mod) 2005 Information technology equipment - EN 60950-1 2006
Safety -
- -  + A11 2009
Part 1: General requirements
+ A1 (mod) 2009 + A1 2010
- -  + A12 2011
- -  + AC 2011
+ A2 (mod) 2013 + A2 2013
Publication Year Title EN/HD Year
IEC 61032 1997 Protection of persons and equipment EN 61032 1998
by enclosures - Probes for verification
IEC 61180-2 -  High-voltage test techniques for low- EN 61180-2 -
voltage equipment -
Part 2: Test equipment
IEC 62053-52 -  Electricity metering equipment (AC) - EN 62053-52 -
Particular requirements -
Part 52: Symbols
ISO 75-2 -  Plastics - Determination of EN ISO 75-2 -
temperature of deflection under load -
Part 2: Plastics and ebonite
ISO 306 -  Plastics - Thermoplastic materials - EN ISO 306 -
Determination of Vicat softening
temperature (VST)
ISO 3864-1 -  Graphical symbols - Safety colours - -
and safety signs -
Part 1: Design principles for safety
signs and safety markings
ISO 7000 2004 Graphical symbols for use on - -
equipment - Index and synopsis

IEC 62052-31 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
colour
inside
Electricity metering equipment (AC) – General 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

– 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
1.4.1 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 terms . 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 General . 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 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 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 Commissioning . 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 user’s 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 . 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 General . 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 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 . 62
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 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 requirements 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 switches . 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 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 lifting 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 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
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 –
Batteries 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 overvoltage 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 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 Insulation 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 (normative) 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 tests 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 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
publications . 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 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 electric 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 same 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 options 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 measuring 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
Figure 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 under 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 arrangement 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-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
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 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 insulation . 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 insulation in circuits having recurring peak voltages . 83
Table 19 – Isolation classes for non-mains-circuits . 85
Table 20 – Insulation requirements between any two circuits . 86
Table 21 – Summary of requirements for current circuits of direct connected meters
without SCS . 95
Table 22 – Summary of requirements for current circuits of direct connected meters
with SCS . 96
Table 23 – Summary of requirements for load control switches . 98
Table 24 – Correction factors according to test site altitude for test voltages for
clearances . 104
Table 25 – AC voltage test . 109
Table 26 – Test sequence and sample plan for supply control switches . 113
Table 27 – Power factor ranges of the test circuit . 116
Table 28 – Test sequence and sample plan for load control switches . 120
Table 29 – Limits of maximum available current . 127
Table 30 – Values for overcurrent protection devices . 127
Table 31 – Surface temperature limits in normal condition . 129
Table 32 – Temperature limits for terminals . 130
Table 33 – Maximum measured total temperatures for internal materials and
components .
...