BS EN IEC 62790:2020
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Junction boxes for photovoltaic modules. Safety requirements and tests
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 62 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 9 | English CONTENTS |
| 12 | FOREWORD |
| 14 | 1 Scope 2 Normative references |
| 16 | 3 Terms and definitions |
| 20 | 4 Constructional requirements and performance 4.1 General |
| 21 | 4.2 Marking and identification 4.2.1 Identification 4.2.2 Marking |
| 22 | 4.2.3 Technical documentation 4.3 Protection against electric shock 4.4 Terminations, connecting devices and connection methods |
| 23 | 4.5 Connectors 4.6 Cables 4.7 Resistance to ageing 4.8 General design |
| 24 | 4.9 Degree of protection (IP) 4.10 Dielectric strength 4.11 Range of ambient temperature 4.12 Cable anchorage 4.13 Mechanical strength |
| 25 | 4.14 Insulation 4.14.1 Type of insulation 4.14.2 Basic insulation 4.14.3 Supplementary insulation 4.14.4 Double insulation 4.14.5 Reinforced insulation Tables Table 1 – Required type of insulation |
| 26 | 4.15 Clearances and creepage distances 4.15.1 Clearances 4.15.2 Creepage distances Table 2 – Rated impulse voltages and minimum clearances |
| 27 | Table 3 – Creepage distances for basic insulation |
| 28 | 4.16 Insulation parts 4.16.1 Outer accessible parts 4.16.2 Inner parts keeping active parts in position 4.17 Current carrying parts and resistance against corrosion |
| 29 | 4.18 Sealing 4.19 Bypass-diode 4.20 Knock-out inlets (outlets) intended to be removed by mechanical impact 5 Tests 5.1 General |
| 30 | 5.2 Preparation of specimens Table 4 – Number of specimens |
| 31 | Table 5 – Values of torque for screw-type clamping units |
| 32 | 5.3 Performance of tests 5.3.1 General 5.3.2 Durability of marking 5.3.3 Fixing of lid on rewirable junction box 5.3.4 Protection against electric shock |
| 33 | 5.3.5 Measurement of clearances and creepage distances 5.3.6 Dielectric strength 5.3.7 Resistance to corrosion 5.3.8 Mechanical strength at lower temperatures |
| 34 | 5.3.9 Thermal cycle test (IEC 60068-2-14:2009, Test Nb) |
| 35 | 5.3.10 Damp heat test 5.3.11 Weather resistance test 5.3.12 Flammability class |
| 36 | 5.3.13 Ball pressure test 5.3.14 Glow wire test 5.3.15 Resistance against ageing 5.3.16 Wet leakage current test |
| 37 | 5.3.17 Humidity freeze test 5.3.18 Bypass diode thermal test |
| 38 | 5.3.19 Test of terminations and connection methods |
| 39 | 5.3.20 Knock-out inlets (outlets) intended to be removed by mechanical impact 5.3.21 Test of cord anchorage |
| 40 | Table 6 – Pull forces for cord anchorage |
| 41 | 5.3.22 Retention on the mounting surface 5.3.23 Reverse current test at junction box Table 7 – Values for torsion test |
| 42 | 5.4 Test schedule Table 8 – Marking, information, documentation, test group A |
| 43 | Table 9 – Material test, test group B (single tests) |
| 44 | Table 10 – Constructional requirements, test group C (single tests) Table 11 – Mechanical tests, test group D (single tests) |
| 45 | Table 12 – Test sequence I, test group E (tests to be performed consecutively in this order) Table 13 – Test sequence II, test group F (tests to be performed consecutively in this order) |
| 46 | Table 14 – Test sequence III, test group G (tests to be performed consecutively in this order) Table 15 – Test sequence IV, test group H (tests to be performed consecutively in this order) Table 16 – Reverse current test, test group I |
| 47 | Figures Figure 1 – Thermal cycling test – Temperature and applied current profile Table 17 – Test sequence V, test group J (tests to be performed consecutively in this order) |
| 48 | Figure 2 – Humidity-freeze cycle Figure 3 – Typical arrangement for the cable anchorage pull test |
| 49 | Figure 4 – Typical arrangement for torsion test Figure 5 – Typical arrangement for flammability test in accordance with 5.3.12.2 |
| 50 | Figure 6 – Measurement of voltage drop Figure 7 – Bypass diode thermal test |
| 51 | Figure 8 – Proper attachment of 5 N weight to junction box |
| 52 | Annex A (informative) Symbol “Do not disconnect under load” Figure A.1 – Symbol “DO NOT DISCONNECT UNDER LOAD” Figure A.2 – Symbol “DO NOT DISCONNECT UNDER LOAD” (IEC 60417-6070:2011-06) |
| 53 | Annex B (normative) Qualification of conformal coatings for protection against pollution B.1 General B.2 Technical properties B.3 Qualification of coatings |
| 54 | Table B.1 – Test parameters, test conditions and test procedures |
| 55 | Table B.2 – Test sequence and conformity check (tests to be performed consecutively in this order) |
| 56 | Annex C (normative) Measurement of clearances and creepage distances Table C.1 – Dimensions of X |
| 59 | Figure C.1 – Examples of methods of measuring clearances and creepage distances |
| 60 | Bibliography |
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