SIST EN IEC 62790:2020

SLOVENSKI STANDARD
SIST EN IEC 62790:2020
01-november-2020
Nadomešča:
SIST EN 62790:2015
Priključnice fotonapetostnih modulov - Varnostne zahteve in preskušanje
Junction boxes for photovoltaic modules - Safety requirements and tests
Anschlussdosen für Photovoltaik-Module - Sicherheitsanforderungen und Prüfungen
Boîtes de jonction pour modules photovoltaïques - Exigences de sécurité et essais
Ta slovenski standard je istoveten z: EN IEC 62790:2020
ICS:
27.160 Sončna energija Solar energy engineering
SIST EN IEC 62790:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62790:2020

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SIST EN IEC 62790:2020


EUROPEAN STANDARD EN IEC 62790

NORME EUROPÉENNE

EUROPÄISCHE NORM
September 2020
ICS 27.160 Supersedes EN 62790:2015 and all of its amendments
and corrigenda (if any)
English Version
Junction boxes for photovoltaic modules - Safety requirements
and tests
(IEC 62790:2020)
Boîtes de jonction pour modules photovoltaïques - Anschlussdosen für Photovoltaik-Module -
Exigences de sécurité et essais Sicherheitsanforderungen und Prüfungen
(IEC 62790:2020) (IEC 62790:2020)
This European Standard was approved by CENELEC on 2020-08-19. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62790:2020 E

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SIST EN IEC 62790:2020
EN IEC 62790:2020 (E)
European foreword
The text of document 82/1719/FDIS, future edition 2 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 IEC 62790:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-19
document have to be withdrawn
This document supersedes EN 62790:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62790:2020 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 60112 NOTE Harmonized as EN 60112
IEC 60228 NOTE Harmonized as EN 60228
IEC 60512-1 NOTE Harmonized as EN IEC 60512-1
IEC 60664-3 NOTE Harmonized as EN 60664-3
IEC 60998-2-1 NOTE Harmonized as EN 60998-2-1
IEC 60998-2-2 NOTE Harmonized as EN 60998-2-2
IEC 61730-2 NOTE Harmonized as EN IEC 61730-2


2

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SIST EN IEC 62790:2020
EN IEC 62790:2020 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where 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 60060-1 - High-voltage test techniques - Part 1: EN 60060-1 -
General definitions and test requirements
IEC 60068-1 - Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60068-2-14 2009 Environmental testing - Part 2-14: Tests - EN 60068-2-14 2009
Test N: Change of temperature
IEC 60068-2-70 - Environmental Testing - Part 2-70: Tests - - -
Test Xb: Abrasion of markings, lettering,
surfaces and materials caused by rubbing
of fingertips and hands
IEC 60068-2-75 - Environmental testing - Part 2-75: Tests - EN 60068-2-75 -
Test Eh: Hammer tests
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 60216-1 - Electrical insulating materials - Thermal EN 60216-1 -
endurance properties - Part 1: Ageing
procedures and evaluation of test results
IEC 60216-5 - Electrical insulating materials - Thermal - -
endurance properties - Part 5:
Determination of relative temperature
index (RTI) of an insulating material
IEC 60352-2 - Solderless connections - Part 2: Crimped EN 60352-2 -
connections - General requirements, test
methods and practical guidance
IEC 60352-3 - Solderless connections - Part 3: EN IEC 60352-3 -
Accessible insulation displacement (ID)
connections - General requirements, test
methods and practical guidance
3

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SIST EN IEC 62790:2020
EN IEC 62790:2020 (E)
Publication Year Title EN/HD Year
IEC 60352-4 - Solderless connections - Part 4: Non- EN IEC 60352-4 -
accessible insulation displacement (ID)
connections - General requirements, test
methods and practical guidance
IEC 60352-5 - Solderless connections - Part 5: Press-in - -
connections - General requirements, test
methods and practical guidance
IEC 60352-6 - Solderless connections - Part 6: Insulation - -
piercing connections - General
requirements, test methods and practical
guidance
IEC 60352-7 - Solderless connections - Part 7: Spring - -
clamp connections - General
requirements, test methods and practical
guidance
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
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 - 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 - Part 10-2: Abnormal EN 60695-10-2 -
heat - Ball pressure test method
IEC 60695-11-10 - Fire hazard testing - Part 11-10: Test EN 60695-11-10 -
flames - 50 W horizontal and vertical flame
test methods
IEC 60695-11-20 - Fire hazard testing - Part 11-20: Test EN 60695-11-20 -
flames - 500 W flame test method
IEC 60947-7-1 - Low-voltage switchgear and controlgear - EN 60947-7-1 -
Part 7-1: Ancillary equipment - Terminal
blocks for copper conductors
IEC 60998-2-3 - Connecting devices for low-voltage circuits EN 60998-2-3 -
for household and similar purposes - Part
2-3: Particular requirements for connecting
devices as separate entities with
insulation-piercing clamping units
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)
4

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SIST EN IEC 62790:2020
EN IEC 62790:2020 (E)
Publication Year Title EN/HD Year
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 2016 Protection against electric shock - EN 61140 2016
Common aspects for installation and
equipment
IEC 61191-1 - Printed board assemblies - Part 1: Generic EN IEC 61191-1 -
specification - Requirements for soldered
electrical and electronic assemblies using
surface mount and related assembly
technologies
IEC 61210 - Connecting devices - Flat quick-connect EN 61210 -
terminations for electrical copper
conductors - Safety requirements
IEC 61215-1 2016 Terrestrial photovoltaic (PV) modules - EN 61215-1 2016
Design qualification and type approval -
Part 1: Test requirements
IEC 61215-2 2016 Terrestrial photovoltaic (PV) modules - EN 61215-2 2017
Design qualification and type approval -
Part 2: Test procedures
IEC 61730-1 2016 Photovoltaic (PV) module safety EN IEC 61730-1 2018
qualification - Part 1: Requirements for
construction
IEC 62852 - Connectors for DC-application in EN 62852 -
photovoltaic systems - Safety
requirements and tests
IEC 62930 - Electric cables for photovoltaic systems - -
with a voltage rating of 1,5 kV DC
ISO 868 2003 Plastics and ebonite - Determination of EN ISO 868 2003
indentation hardness by means of a
durometer (Shore hardness)
ISO 4892-2 - Plastics - Methods of exposure to EN ISO 4892-2 -
laboratory light sources - Part 2: Xenon-
arc lamps
ISO 4892-3 - Plastics - Methods of exposure to EN ISO 4892-3 -
laboratory light sources - Part 3:
fluorescent UV lamps

5

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SIST EN IEC 62790:2020

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SIST EN IEC 62790:2020




IEC 62790

®


Edition 2.0 2020-07




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


INTERNATIONALE




ICS 27.160 ISBN 978-2-8322-8488-9




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 IEC 62790:2020
– 2 – IEC 62790:2020 © IEC 2020
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 . 14
4.2.1 Identification . 14
4.2.2 Marking . 14
4.2.3 Technical documentation . 15
4.3 Protection against electric shock . 15
4.4 Terminations, connecting devices and connection methods . 15
4.5 Connectors . 16
4.6 Cables . 16
4.7 Resistance to ageing . 16
4.8 General design . 16
4.9 Degree of protection (IP) . 17
4.10 Dielectric strength . 17
4.11 Range of ambient temperature . 17
4.12 Cable anchorage . 17
4.13 Mechanical strength . 17
4.14 Insulation . 18
4.14.1 Type of insulation . 18
4.14.2 Basic insulation . 18
4.14.3 Supplementary insulation . 18
4.14.4 Double insulation . 18
4.14.5 Reinforced insulation . 18
4.15 Clearances and creepage distances . 19
4.15.1 Clearances . 19
4.15.2 Creepage distances . 19
4.16 Insulation parts . 21
4.16.1 Outer accessible parts . 21
4.16.2 Inner parts keeping active parts in position . 21
4.17 Current carrying parts and resistance against corrosion . 21
4.18 Sealing . 22
4.19 Bypass-diode . 22
4.20 Knock-out inlets (outlets) intended to be removed by mechanical impact . 22
5 Tests . 22
5.1 General . 22
5.2 Preparation of specimens . 23
5.3 Performance of tests . 25
5.3.1 General . 25
5.3.2 Durability of marking . 25
5.3.3 Fixing of lid on rewirable junction box . 25
5.3.4 Protection against electric shock . 25
5.3.5 Measurement of clearances and creepage distances . 26

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SIST EN IEC 62790:2020
IEC 62790:2020 © IEC 2020 – 3 –
5.3.6 Dielectric strength . 26
5.3.7 Resistance to corrosion . 26
5.3.8 Mechanical strength at lower temperatures . 26
5.3.9 Thermal cycle test (IEC 60068-2-14:2009, Test Nb) . 27
5.3.10 Damp heat test . 28
5.3.11 Weather resistance test . 28
5.3.12 Flammability class . 28
5.3.13 Ball pressure test . 29
5.3.14 Glow wire test . 29
5.3.15 Resistance against ageing . 29
5.3.16 Wet leakage current test . 29
5.3.17 Humidity freeze test . 30
5.3.18 Bypass diode thermal test . 30
5.3.19 Test of terminations and connection methods . 31
5.3.20 Knock-out inlets (outlets) intended to be removed by mechanical impact . 32
5.3.21 Test of cord anchorage . 32
5.3.22 Retention on the mounting surface . 34
5.3.23 Reverse current test at junction box . 34
5.4 Test schedule . 35
Annex A (informative) Symbol "Do not disconnect under load" . 45
Annex B (normative) Qualification of conformal coatings for protection against
pollution . 46
B.1 General . 46
B.2 Technical properties . 46
B.3 Qualification of coatings . 46
Annex C (normative) Measurement of clearances and creepage distances . 49
Bibliography . 53

Figure 1 – Thermal cycling test – Temperature and applied current profile . 40
Figure 2 – Humidity-freeze cycle . 41
Figure 3 – Typical arrangement for the cable anchorage pull test . 41
Figure 4 – Typical arrangement for torsion test . 42
Figure 5 – Typical arrangement for flammability test in accordance with 5.3.12.2 . 42
Figure 6 – Measurement of voltage drop . 43
Figure 7 – Bypass diode thermal test . 43
Figure 8 – Proper attachment of 5 N weight to junction box. 44
Figure A.1 – Symbol "DO NOT DISCONNECT UNDER LOAD" . 45
Figure A.2 – Symbol "DO NOT DISCONNECT UNDER LOAD" (IEC 60417-6070:2011-06) . 45
Figure C.1 – Examples of methods of measuring clearances and creepage distances . 52

Table 1 – Required type of insulation . 18
Table 2 – Rated impulse voltages and minimum clearances . 19
Table 3 – Creepage distances for basic insulation . 20
Table 4 – Number of specimens . 23
Table 5 – Values of torque for screw-type clamping units . 24
Table 6 – Pull forces for cord anchorage . 33

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Table 7 – Values for torsion test . 34
Table 8 – Marking, information, documentation, test group A . 35
Table 9 – Material test, test group B (single tests) . 36
Table 10 – Constructional requirements, test group C (single tests) . 37
Table 11 – Mechanical tests, test group D (single tests) . 37
Table 12 – Test sequence I, test group E (tests to be performed consecutively in this
order). 38
Table 13 – Test sequence II, test group F (tests to be performed consecutively in this
order). 38
Table 14 – Test sequence III, test group G (tests to be performed consecutively in this
order). 39
Table 15 – Test sequence IV, test group H (tests to be performed consecutively in this
order). 39
Table 16 – Reverse current test, test group I . 39
Table 17 – Test sequence V, test group J (tests to be performed consecutively in this
order). 40
Table B.1 – Test parameters, test conditions and test procedures. 47
Table B.2 – Test sequence and conformity check (tests to be performed consecutively
in this order) . 48
Table C.1 – Dimensions of X . 49

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SIST EN IEC 62790:2020
IEC 62790:2020 © IEC 2020 – 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
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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.
This second edition cancels and replaces the first edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Modifications in normative references and terms and definitions;
b) Improvement of declaration of categories for junction boxes in 4.1;
c) Clarification for ambient temperature in 4.1;
d) Addition of requirement to provide information concerning RTE/RTI or TI in 4.2;
e) Reference to IEC 62930 instead of EN 50618 in 4.6;
f) Addition of "Functional insulation" in Table 1;

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SIST EN IEC 62790:2020
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g) Addition of "Distance through cemented joints" in Table 3;
h) Correction of procedure of process to categorize material groups (deletion of PTI) in
4.15.2.3;
i) Requirement for approval of RTE/RTI or TI for insulation parts in 4.16.1 and 4.16.2;
j) Change of requirements concerning electrochemical potential in 4.17.2;
k) Clarification for IP-test in 5.3.4.2;
l) Addition of test voltage for cemented joints in 5.3.6 and 5.3.16;
m) Addition of detailed description on how to prepare the test sample for the thermal cycle
test in 5.3.9.1;
n) New test procedure for bypass diode thermal test (5.3.18) in accordance with MQT 18.1 of
IEC 61215-2:2016;
o
...