SIST EN 62790:2015
(Main)Junction boxes for photovoltaic modules - Safety requirements and tests
Junction boxes for photovoltaic modules - Safety requirements and tests
This International Standard describes safety requirements, constructional requirements and
tests for junction boxes up to 1 500 V dc for use on photovoltaic modules according to class II
of IEC 61140:2001.
This standard applies also to enclosures mounted on PV-modules containing electronic
circuits for converting, controlling, monitoring or similar operations. Additional requirements
concerning the relevant operations are applied under consideration of the environmental
conditions of the PV-modules. This standard does not apply to the electronic circuits of these
devices, for which other IEC-standards apply.
NOTE For junction boxes according to classes 0 and III of IEC 61140:2001, in photovoltaic-systems, this standard
can be used as a guideline.
Anschlussdosen für Photovoltaik-Module - Sicherheitsanforderungen und Prüfungen
Boîtes de jonction pour modules photovoltaïques - Exigences de sécurité et essais
L'IEC 62790:2014 décrit les exigences de sécurité, les exigences de construction et les essais relatifs aux boîtes de jonction jusqu'à 1 500 V en courant continu utilisées sur des modules photovoltaïques conformes à la classe II de l'IEC 61140:2001. La présente Norme s'applique également aux enveloppes montées sur des modules photovoltaïques comportant des circuits électroniques pour la conversion, le contrôle, la surveillance ou opérations similaires.
Priključnice fotonapetostnih modulov - Varnostne zahteve in preskušanje (IEC 62790:2014)
Ta mednarodni standard opisuje varnostne zahteve, konstrukcijske zahteve in preskuse za priključnice do 1500 V enosmerne napetosti za uporabo v fotonapetostnih modulih v skladu z razredom II standarda IEC 61140:2001.
Ta standard velja tudi za okrove, nameščene na fotonapetostnih modulih z elektronskimi vezji za pretvarjanje, kontroliranje, nadzorovanje ali podobne operacije. Na podlagi upoštevanja okoljskih pogojev fotonapetostnih modulov se uporabljajo dodatne zahteve glede ustreznih operacij. Ta standard se ne uporablja za elektronska vezja teh naprav, za katere se uporabljajo drugi standardi IEC.
OPOMBA: Pri priključnicah razreda 0 in III v skladu s standardom IEC 61140:2001 v fotonapetostnih sistemih se lahko ta standard uporablja kot smernica.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62790:2015
01-maj-2015
3ULNOMXþQLFHIRWRQDSHWRVWQLKPRGXORY9DUQRVWQH]DKWHYHLQSUHVNXãDQMH ,(&
Junction boxes for photovoltaic modules - Safety requirements and tests
Ta slovenski standard je istoveten z: EN 62790:2015
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 62790:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62790:2015
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SIST EN 62790:2015
EUROPEAN STANDARD EN 62790
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 27.160
English Version
Junction boxes for photovoltaic modules - Safety requirements
and tests
(IEC 62790:2014)
Boîtes de jonction pour modules photovoltaïques - Anschlussdosen für Photovoltaik-Module -
Exigences de sécurité et essais Sicherheitsanforderungen und Prüfungen
(IEC 62790:2014) (IEC 62790:2014)
This European Standard was approved by CENELEC on 2014-12-11. 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
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62790:2015 E
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SIST EN 62790:2015
EN 62790:2015 - 2 -
Foreword
The text of document 82/876/FDIS, future edition 1 of IEC 62790, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62790:2015.
The following dates are fixed:
(dop) 2015-09-13
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2017-12-11
• 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 62790:2014 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 60352-3 NOTE Harmonized as EN 60352-3.
IEC 60352-4 NOTE Harmonized as EN 60352-4.
IEC 60364-7-712 NOTE Harmonized as HD 60364-7-712.
IEC 60512-1 NOTE Harmonized as EN 60512-1.
IEC 60695-10-2 NOTE Harmonized as EN 60695-10-2.
IEC 61210 NOTE Harmonized as EN 61210.
IEC 61215 NOTE Harmonized as EN 61215.
IEC 61646 NOTE Harmonized as EN 61646.
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SIST EN 62790:2015
- 3 - EN 62790:2015
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
- - Electric cables for photovoltaic systems EN 50618 -
IEC 60060-1 - High-voltage test techniques - EN 60060-1 -
Part 1: General definitions and test
requirements
IEC 60068-1 - Environmental testing - EN 60068-1 -
Part 1: General and guidance
IEC 60068-2-14 2009 Environmental testing - EN 60068-2-14 2009
Part 2-14: Tests - Test N: Change of
temperature
IEC 60068-2-70 - Environmental testing - EN 60068-2-70 -
Part 2: Tests - Test Xb: Abrasion of
markings and letterings caused by rubbing
of fingers and hands
IEC 60068-2-75 - Environmental testing - EN 60068-2-75 -
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 60228 - Conductors of insulated cables EN 60228 -
IEC 60352-2 - Solderless connections - EN 60352-2 -
Part 2: Crimped connections - General
requirements, test methods and practical
guidance
IEC 60512-12-1 - Connectors for electronic equipment - EN 60512-12-1 -
Tests and measurements -
Part 12-1: Soldering tests - Test 12a:
Solderability, wetting, solder bath method
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SIST EN 62790:2015
EN 62790:2015 - 4 -
Publication Year Title EN/HD Year
IEC 60512-12-2 - Connectors for electronic equipment - EN 60512-12-2 -
Tests and measurements -
Part 12-2: Soldering tests - Test 12b:
Solderability, wetting, soldering iron
method
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60664-1 2007 Insulation coordination for equipment within EN 60664-1 2007
low-voltage systems -
Part 1: Principles, requirements and tests
IEC/TR 60664-2-1 - Insulation coordination for equipment within - -
low-voltage systems -
Part 2-1: Application guide - Explanation of
the application of the IEC 60664 series,
dimensioning examples and dielectric
testing
IEC 60664-3 - Insulation coordination for equipment within EN 60664-3 -
low-voltage systems -
Part 3: Use of coating, potting or moulding
for protection against pollution
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 60695-11-10 - Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W horizontal
and vertical flame test methods
IEC 60695-11-20 1999 Fire hazard testing - EN 60695-11-20 1999
Part 11-20: Test flames - 500 W flame test
methods
IEC/TR 60943 - Guidance concerning the permissible - -
temperature rise for parts of electrical
equipment, in particular for terminals
IEC 60947-7-1 - Low-voltage switchgear and controlgear - EN 60947-7-1 -
Part 7-1: Ancillary equipment - Terminal
blocks for copper conductors
IEC 60998-2-1 - Connecting devices for low-voltage circuits EN 60998-2-1 -
for household and similar purposes -
Part 2-1: Particular requirements for
connecting devices as separate entities
with screw-type clamping units
IEC 60998-2-2 - Connecting devices for low-voltage circuits EN 60998-2-2 -
for household and similar purposes -
Part 2-2: Particular requirements for
connecting devices as separate entities
with screwless-type clamping units
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SIST EN 62790:2015
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Publication Year Title EN/HD Year
IEC 60999-1 1999 Connecting devices - Electrical copper EN 60999-1 2000
conductors - Safety requirements for
screw-type and screwless-type clamping
units -
Part 1: General requirements and particular
requirements for clamping units for
conductors from 0,2 mm² up to 35 mm²
(included)
IEC 60999-2 - Connecting devices - Electrical copper EN 60999-2 -
conductors - Safety requirements for
screw-type and screwless-type clamping
units -
Part 2: Particular requirements for
clamping units for conductors above
35 mm² up to 300 mm² (included)
IEC 61032 - Protection of persons and equipment by EN 61032 -
enclosures - Probes for verification
IEC 61140 2001 Protection against electric shock - EN 61140 2002
Common aspects for installation and
equipment
IEC 61730-1 - Photovoltaic (PV) module safety EN 61730-1 -
qualification -
Part 1: Requirements for construction
IEC 61730-2 (mod) 2004 Photovoltaic (PV) module safety EN 61730-2 2007
qualification -
Part 2: Requirements for testing
IEC 62852 - Connectors for DC-application in EN 62852 -
photovoltaic systems - Safety requirements
and tests
ISO 868 2003 Plastics and ebonite - Determination of EN ISO 868 2003
indentation hardness by means of a
durometer (Shore hardness)
ISO 4892-2 2013 Plastics - Methods of exposure to EN ISO 4892-2 2013
laboratory light sources -
Part 2: Xenon-arc lamps
ISO 4892-3 2006 Plastics - Methods of exposure to EN ISO 4892-3 2006
laboratory light sources -
Part 3: Fluorescent UV lamps
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SIST EN 62790:2015
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SIST EN 62790:2015
IEC 62790
®
Edition 1.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Junction boxes for photovoltaic modules – Safety requirements and tests
Boîtes de jonction pour modules photovoltaïques – Exigences de sécurité et
essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 27.160 ISBN 978-2-8322-1899-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 62790:2015
– 2 – IEC 62790:2014 © IEC 2014
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Constructional requirements and performance . 13
4.1 General . 13
4.2 Marking and identification . 13
4.2.1 Identification . 13
4.2.2 Marking . 14
4.2.3 Technical documentation . 14
4.3 Protection against electric shock . 14
4.4 Terminations, connecting devices and connection methods . 14
4.5 Connectors . 15
4.6 Cable . 15
4.7 Resistance to aging . 15
4.8 General design . 16
4.9 Degree of protection (IP) . 16
4.10 Dielectric strength . 16
4.11 Range of ambient temperature . 16
4.12 Cable anchorage . 16
4.13 Mechanical strength . 17
4.14 Insulation . 17
4.14.1 Type of insulation . 17
4.14.2 Basic insulation . 17
4.14.3 Supplementary insulation . 17
4.14.4 Double insulation . 17
4.14.5 Reinforced insulation . 18
4.15 Clearances and creepage distances . 18
4.15.1 Clearances . 18
4.15.2 Creepage distances . 18
4.16 Insulation parts . 20
4.16.1 Outer accessible parts . 20
4.16.2 Inner parts keeping active parts in position . 20
4.17 Current carrying parts and resistance against corrosion . 20
4.18 Sealing . 20
4.19 Bypass-diode . 20
4.20 Knock-out inlets (outlets) intended to be removed by mechanical impact . 21
5 Tests . 21
5.1 General . 21
5.2 Preparation of specimens . 23
5.3 Performance of tests . 24
5.3.1 General . 24
5.3.2 Durability of marking . 24
5.3.3 Fixing of lid on rewirable junction box . 24
5.3.4 Protection against electric shock . 25
5.3.5 Measurement of clearances and creepage distances . 25
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SIST EN 62790:2015
IEC 62790:2014 © IEC 2014 – 3 –
5.3.6 Dielectric strength . 25
5.3.7 Resistance to corrosion . 25
5.3.8 Mechanical strength at lower temperatures . 25
5.3.9 Thermal cycle test (IEC 60068-2-14:2009, Test Nb) . 26
5.3.10 Damp heat test . 26
5.3.11 Weather resistance test . 26
5.3.12 Flammability class . 27
5.3.13 Ball pressure test . 27
5.3.14 Glow wire test . 27
5.3.15 Resistance against ageing . 27
5.3.16 Wet leakage current test . 27
5.3.17 Humidity-freeze-test . 28
5.3.18 Bypass diode thermal test . 29
5.3.19 Test of terminations and connection methods . 30
5.3.20 Knock-out inlets (outlets) intended to be removed by mechanical impact . 30
5.3.21 Test of cord anchorage . 31
5.3.22 Retention on the mounting surface . 32
5.3.23 Reverse current test at junction box . 33
5.4 Test schedule . 33
Annex A (informative) Symbol "Do not disconnect under load" . 42
Annex B (normative) Qualification of conformal coatings for protection against
pollution . 43
B.1 General . 43
B.2 Technical properties . 43
B.3 Qualification of coatings . 43
Annex C (normative) Measurement of clearances and creepage distances . 46
Bibliography . 50
Figure 1 – Thermal cycling test . 38
Figure 2 – Humidity-freeze cycle . 39
Figure 3 – Typical arrangement for the cable anchorage pull test . 39
Figure 4 – Typical arrangement for torsion test . 40
Figure 5 – Typical arrangement for flammability test according to 5.3.12.2 . 40
Figure 6 – Measurement of voltage drop . 41
Figure A.1 – Symbol "DO NOT DISCONNECT UNDER LOAD" . 42
Figure A.2 – Symbol "DO NOT DISCONNECT UNDER LOAD" (IEC 60417-6070) . 42
Figure B.1 – Test sequence and conformity check . 45
Figure C.1 – Examples of methods of measuring clearances and creepage distances . 49
Table 1 – Required type of insulation . 17
Table 2 – Rated impulse voltages and minimum clearances . 18
Table 3 – Creepage distances for basic insulation . 19
Table 4 – Number of specimens . 22
Table 5 – Values of torque for screw-type clamping units . 23
Table 6 – Pull forces for cord anchorage . 32
Table 7 – Values for torsion test . 32
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SIST EN 62790:2015
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Table 8 – Marking, information, documentation, test group A . 33
Table 9 – Material test, test group B (single tests) . 34
Table 10 – Constructional requirements, test group C (single tests) . 35
Table 11 – Mechanical tests, test group D (single tests) . 35
Table 12 – Test sequence I, test group E (tests to be performed consecutively in this
order). 36
Table 13 – Test sequence II, test group F (tests to be performed consecutively in this
order). 36
Table 14 – Test sequence III, test group G (tests to be performed consecutively in this
order). 37
Table 15 – Test sequence IV, test group H (tests to be performed consecutively in this
order). 37
Table 16 – Reverse current test, test group I . 37
Table 17 – Test sequence V, test group J (tests to be performed consecutively in this
order). 38
Table B.1 – Test parameters, test conditions and test procedures. 44
Table C.1 – Dimensions of X . 46
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SIST EN 62790:2015
IEC 62790:2014 © IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
JUNCTION BOXES FOR PHOTOVOLTAIC MODULES –
SAFETY REQUIREMENTS AND TESTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62790 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The European Standard EN 50548 (first edition, 2011), has served as a basis for the
elaboration of this standard.
The text of this standard is based on the following documents:
FDIS Report on voting
82/876/FDIS 82/902/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
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SIST EN 62790:2015
– 6 – IEC 62790:2014 © IEC 2014
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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SIST EN 62790:2015
IEC 62790:2014 © IEC 2014 – 7 –
JUNCTION BOXES FOR PHOTOVOLTAIC MODULES –
SAFETY REQUIREMENTS AND TESTS
1 Scope
This International Standard describes safety requirements, constructional requirements and
tests for junction boxes up to 1 500 V dc for use on photovoltaic modules according to class II
of IEC 61140:2001.
This standard applies also to enclosures mounted on PV-modules containing electronic
circuits for converting, controlling, monitoring or similar operations. Additional requirements
concerning the relevant operations are applied under consideration of the environmental
conditions of the PV-modules. This standard does not apply to the electronic circuits of these
devices, for which other IEC-standards apply.
NOTE For junction boxes according to classes 0 and III of IEC 61140:2001, in photovoltaic-systems, this standard
can be used as a guideline.
2 Normative references
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.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirem
...
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