Electricity metering equipment (AC) - General requirements, tests and test conditions - Part 31: Safety requirements and tests

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:
• electromechanical meters, static meters and equipment for tariff and load control;
• direct connected, current transformer operated, voltage and current transformer operated
meters;
• protective class I and protective class II equipment;
• wall or cabinet mounted, rack mounted and panel mounted equipment;
• 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:
• equipment where the voltage line-to-neutral derived from nominal voltages exceeds 600 V;
• portable meters;
NOTE 6 Portable meters are meters that are not permanently connected.
laboratory and mobile meter test equipment;
• reference standard meters.
The safety requirements of this standard are based on the following assumptions:
• metering equipment has been installed correctly;
• 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;
• during normal use all terminal covers, covers and barriers providing protection against
accessing hazardous live parts are in place;
• 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.

Wechselstrom-Elektrizitätszähler - Allgemeine Anforderungen, Prüfungen und Prüfbedingungen - Teil 31: Sicherheitsanforderungen und Prüfungen

Equipement de comptage de l'électricité (CA) - Exigences générales, essais et conditions d'essai - Partie 31 : Exigences et essais sur la sécurité de produit

L’IEC 62052-31:2015, spécifie les exigences de sécurité de produit pour les équipements de mesure et de régulation de l'énergie électrique. Elle l’IEC 62052, spécifie les exigences de sécurité de produit pour les équipements de mesure et de régulation de l'énergie électrique. Elle s'applique au nouvel équipement de comptage fabriqué, conçu pour mesurer et réguler l'énergie électrique sur des réseaux de 50 Hz ou 60 Hz avec une tension pouvant aller jusqu'à 600 V, où tous les éléments fonctionnels, y compris les modules d'extension, sont inclus dans ou forment un boîtier unique. Elle s’applique également aux équipements de comptage comportant des interrupteurs de commande d'alimentation et de commande de charge, mais uniquement à ceux qui sont à fonctionnement électromécanique. La présente version bilingue (2016-11) correspond à la version anglaise monolingue publiée en 2015-09.

Oprema za merjenje električne energije (izmenični tok) - Splošne zahteve, preskusi in pogoji preskušanja - 31. del: Varnostne zahteve in preskusi

Ta del standarda IEC 62052 določa zahteve za varnost izdelka za opremo za merjenje in nadzor električne energije.
OPOMBA 1: za druge zahteve glejte ustrezne standarde.
Ta mednarodni standard se uporablja za novo proizvedeno merilno opremo, zasnovano za merjenje in nadzor električne energije v omrežjih s frekvenco 50 ali 60 Hz in napetostjo do 600 V, pri čemer so vsi funkcionalni elementi, vključno z dodatnimi moduli, v enotnem ohišju.
OPOMBA 2: zgoraj omenjena napetost je napetost med linijskim in nevtralnim vodnikom, izpeljana iz nazivnih napetosti. Glej preglednico 7.
Ta mednarodni standard se uporablja tudi za merilno opremo, ki vsebuje elektromehanska stikala za nadzor napajanja in obremenitve.
OPOMBA 3: za komponente in podsestave glej točko 13.
Ko je taka oprema zasnovana za namestitev v posebej zasnovano vtičnico, zahteve veljajo za opremo, ko je nameščena v vtičnico, in ko je treba opraviti preskuse na opremi. Zahteve za vtičnice ter vstavljanje in odstranjevanje merilnikov iz vtičnice ne spadajo v področje uporabe tega standarda.
Ta mednarodni standard se uporablja tudi za pomožna vhodna in izhodna vezja.
OPOMBA 4: primeri so impulzni vhodi in izhodi, krmilni vhodi in izhodi, vezja za izmenjavo podatkov merilnikov.
Ta standard razlikuje:
• elektromehanične in statične merilnike ter opremo za nadzor tarif in obremenitve;
• neposredno povezane merilnike, merilnike, ki jih upravljajo tokovni transformatorji ter merilnike, ki jih upravljajo napetostni in tokovni transformatorji;
• zaščitno opremo razreda I in II;
• opremo, montirano na zid, v ploščo ali omarice in opremo, nameščeno na stojalo;
• opremo za uporabo v zaprtih prostorih in na prostem.
Oprema, uporabljena skupaj z opremo za merjenje in nadzor električne energije, bo morda morala biti skladna z dodatnimi zahtevami za varnost. Glej tudi točko 13.
OPOMBA 5: primeri so telekomunikacijski modemi in enote za obveščanje strank.
Ta mednarodni standard se ne uporablja za:
• opremo, katere napetost med linijskim in nevtralnim vodnikom, izpeljana iz nazivnih napetosti, presega 600 V;
• prenosne merilnike;
OPOMBA 6: prenosni merilniki so merilniki, ki niso trajno priključeni.
• laboratorijska in mobilna preskusna oprema za merilnike;
• standardni referenčni merilniki.
Varnostne zahteve tega standarda so osnovane na naslednjih predpostavkah:
• merilna oprema je bila pravilno nameščena;
• merilno opremo na splošno uporabljajo neizkušene osebe, vključno z odčitovalci števcev in uporabniki električne energije. V številnih primerih je oprema montirana tako, da je lahko dostopna. Pokrove priključkov se lahko odstrani in omarico se lahko odpre samo, če se odstranijo tesnila, pri čemer je treba uporabiti orodje;
• med običajno uporabo so nameščeni vsi pokrovi priključkov, pokrovi in pregrade, ki zagotavljajo zaščito pred dostopom do nevarnih delov pod napetostjo;
• za montažo, konfiguracijo, vzdrževanje in popravilo je pokrove priključkov, ohišje (ali del ohišja) ali pregrade morda treba odstraniti, tako da je omogočen dostop do nevarnih delov pod napetostjo. Ta dejanja mora opravljati izkušeno osebje, ki je ustrezno usposobljeno in je seznanjeno z delovnimi postopki, potrebnimi za zagotavljanje varnosti. Varnostne zahteve, ki zajemajo te pogoje, tako ne spadajo v področje uporabe tega standarda.

General Information

Status
Published
Publication Date
28-Aug-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Jul-2016
Due Date
12-Sep-2016
Completion Date
29-Aug-2016

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SLOVENSKI STANDARD
SIST EN 62052-31:2016
01-september-2016

2SUHPD]DPHUMHQMHHOHNWULþQHHQHUJLMH L]PHQLþQLWRN 6SORãQH]DKWHYHSUHVNXVL

LQSRJRMLSUHVNXãDQMDGHO9DUQRVWQH]DKWHYHLQSUHVNXVL

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
SIST EN 62052-31:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62052-31:2016
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SIST EN 62052-31:2016
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
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SIST EN 62052-31:2016
EN 62052-31:2016
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.
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SIST EN 62052-31:2016
EN 62052-31:2016
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).
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SIST EN 62052-31:2016
EN 62052-31:2016
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.
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SIST EN 62052-31:2016
EN 62052-31:2016
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 -
- - + 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.
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SIST EN 62052-31:2016
EN 62052-31:2016
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
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SIST EN 62052-31:2016
EN 62052-31:2016
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
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SIST EN 62052-31:2016
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SIST EN 62052-31:2016
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

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 11 ----------------------
SIST EN 62052-31:2016
– 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

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SIST EN 62052-31:2016
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

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SIST EN 62052-31:2016
– 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

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