1、 IEC 62790 Edition 1.0 2014-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Junction boxes for photovoltaic modules Safety requirements and tests Botes de jonction pour modules photovoltaques Exigences de scurit et essais IEC 62790:2014-11(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED
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19、es sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 62790 Edition 1.0 2014-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Junction boxes for photovoltaic modules Safety requirements and tests Botes de jonction pour modules photovoltaques Exigences de scurit et essai
20、s INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 27.160 PRICE CODE CODE PRIX ISBN 978-2-8322-1899-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that
21、 you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 62790:2014 IEC 2014 CONTENTS FOREWORD . 5 1 Scope 7 2 Normative references 7 3 Terms and definitions 9 4 Constructional
22、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
23、 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 Suppl
24、ementary 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
25、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
26、 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 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 l
27、ower 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
28、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 c
29、urrent 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
30、 (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 fo
31、r 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 measu
32、ring 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
33、for cord anchorage . 32 Table 7 Values for torsion test . 32 4 IEC 62790:2014 IEC 2014 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, te
34、st 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
35、 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 t
36、est procedures. 44 Table C.1 Dimensions of X . 46 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 standardizatio
37、n 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 Internationa
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46、 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 h
47、eld 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 te
48、xt 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. 6 IEC 62790:2014 IEC 2014 This publication has been drafted in acc
49、ordance 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 Th
