Junction boxes for photovoltaic modules - Safety requirements and tests

IEC 62790:2020 is available as IEC 62790:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62790:2020 describes safety requirements, constructional requirements and tests for junction boxes up to 1 500 V DC for use on photovoltaic modules in accordance with class II of IEC 61140:2016.
This document 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 document does not apply to the electronic circuits of these devices, for which other IEC standards apply. This second edition cancels and replaces the first edition published in 2014. This edition includes the following significant technical changes with respect to the previous edition:
- Modifications in normative references and terms and definitions;
- Improvement of declaration of categories for junction boxes in 4.1;
- Clarification for ambient temperature in 4.1;
- Addition of requirement to provide information concerning RTE/RTI or TI in 4.2;
- Reference to IEC 62930 instead of EN 50618 in 4.6;
- Addition of "Functional insulation" in Table 1;
- Addition of "Distance through cemented joints" in Table 3;
- Correction of procedure of process to categorize material groups (deletion of PTI) in 4.15.2.3;
- Requirement for approval of RTE/RTI or TI for insulation parts in 4.16.1 and 4.16.2;
- Change of requirements concerning electrochemical potential in 4.17.2;
- Clarification for IP-test in 5.3.4.2;
- Addition of test voltage for cemented joints in 5.3.6 and 5.3.16;
- Addition of detailled description on how to prepare the test sample for the thermal cycle test in 5.3.9.1;
- New test procedure for bypass diode thermal test (5.3.18) in accordance with MQT 18.1 of IEC 61215-2:2016;
- New test procedure for reverse overload current test in 5.3.23;
- New Figure 1 for thermal cycle test.

Boîtes de jonction pour modules photovoltaïques - Exigences de sécurité et essais

IEC 62790:2020 est disponible sous forme de IEC 62790:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 62790:2020 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 61140:2016. Le présent document s’applique également aux enveloppes montées sur des modules photovoltaïques comportant des circuits électroniques pour la conversion, le contrôle, la surveillance ou opérations similaires. Des exigences supplémentaires concernant les opérations correspondantes sont appliquées en considérant les conditions d’environnement des modules photovoltaïques. Le présent document ne s’applique pas aux circuits électroniques de ces dispositifs pour lesquels d’autres normes IEC s’appliquent. Cette deuxième édition annule et remplace la première édition parue en 2014. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Modifications des références normatives et des termes et définitions;
- Amélioration de la catégorisation des boîtes de jonction en 4.1;
- Clarification de la température ambiante en 4.1;
- Ajout de l'exigence prévoyant de fournir les indices RTE/RTI ou IT en 4.2;
- Référence à l’IEC 62930 à la place de la référence à l’EN 50618 en 4.6;
- Ajout de "l'isolation fonctionnelle" dans le Tableau 1;
- Ajout de "ligne de fuite entre les bords du joint scellé" dans le Tableau 3;
- Correction de la procédure du processus de catégorisation des groupes de matériaux (suppression de l’ITC) au 4.15.2.3;
- Exigence d'approbation des indices RTE/RTI ou IT pour les parties isolantes en 4.16.1 et 4.16.2;
- Modification des exigences concernant le potentiel électrochimique en 4.17.2;
- Clarification des essais de vérification du code IP au 5.3.4.2;
- Ajout de la tension d'essai pour les joints scellés en 5.3.6 et 5.3.16;
- Ajout de la description détaillée sur la façon de préparer les éprouvettes pour l'essai de cycle thermique en 5.3.9.1;
- Nouvelle procédure d'essai pour l'essai thermique la diode de dérivation (5.3.18) conformément au MQT 18.1 de l’IEC 61215-2: 2016;
- Nouvelle procédure d'essai pour l'essai de courant de surcharge inverse au 5.3.23;
- Nouvelle Figure 1 pour l'essai de cycle thermique.

General Information

Status
Published
Publication Date
14-Jul-2020
Current Stage
PPUB - Publication issued
Completion Date
15-Jul-2020
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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
IEC 62790:2020-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
– 4 – IEC 62790:2020 © IEC 2020

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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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

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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;
---------------------- Page: 7 ----------------------
– 6 – IEC 62790:2020 © IEC 2020
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) New test procedure for reverse overload current test in 5.3.23;
p) New Figure 1 for thermal cycle test.
The text of this International Standard is based on the following documents:
FDIS Report on voting
82/1719/FDIS 82/1738/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document 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 document. At this date, the document 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.
---------------------- Page: 8 ----------------------
IEC 62790:2020 © IEC 2020 – 7 –
JUNCTION BOXES FOR PHOTOVOLTAIC MODULES –
SAFETY REQUIREMENTS AND TESTS
1 Scope

This document describes safety requirements, constructional requirements and tests for

junction boxes up to 1 500 V DC for use on photovoltaic modules in accordance with class II

of IEC 61140:2016.

This document 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 document does not apply to the electronic circuits of these

devices, for which other IEC standards apply.

NOTE For junction boxes in accordance with classes 0 and III of IEC 61140:2016, in photovoltaic-systems, this

document can be used as a guideline.
2 Normative references

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.

IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements

IEC 60068-1, Environmental testing – Part 1: General and guidance

IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of

temperature

IEC 60068-2-70, Environmental testing – Part 2-70: Tests – Test Xb: Abrasion of markings

and letterings caused by rubbing of fingers and hands
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests

IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady

state

IEC 60216-1, Electrical insulating materials – Thermal 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 thermal endurance index (RTE) of an insulating material

IEC 60352-2, Solderless connections – Part 2: Crimped connections – General requirements,

test methods and practical guidance

IEC 60352-3, Solderless connections – Part 3: Solderless accessible insulation displacement

connections – General requirements, test methods and practical guidance
---------------------- Page: 9 ----------------------
– 8 – IEC 62790:2020 © IEC 2020

IEC 60352-4, Solderless connections – Part 4: Solderless non-accessible insulation

displacement 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 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 heat – Ball pressure test method

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods

IEC 60695-11-20, Fire hazard testing – Part 11-20: Test flames – 500 W flame test method

IEC 60947-7-1, Low-voltage switchgear and controlgear – Part 7-1: Ancillary equipment –

Terminal blocks for copper conductors

IEC 60998-2-3, Connecting devices for low-voltage circuits 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 conductors – Safety requirements

for screw-type and screwless-type clamping units – Part 1: General requirements and

2 2

particular requirements for clamping units for conductors from 0,2 mm up to 35 mm

(included)

IEC 60999-2, Connecting devices – Electrical copper conductors – Safety requirements for

screw-type and screwless-type clamping units – Part 2: Particular requirements for clamping

2 2
units for conductors above 35 mm up to 300 mm (included)
IEC 61032, Protection of persons and equipment by enclos
...

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