IEC 62790-2014 pdf – 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 61 1 40:2001 . 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 61 1 40:2001 , 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 requirements IEC 60068-1 , Environmental testing – Part 1: General and guidance IEC 60068-2-1 4:2009, Environmental testing – Part 2-14: Tests – Test N: Change of temperature IEC 60068-2-70, Environmental testing – Part 2: 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 60228, Conductors of insulated cables
IEC 60664-1 :2007, Insulation coordination for equipment within 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 low-voltage systems – Part 3: Use of coating, potting or moulding for protection against pollution IEC 60695-2-1 1 , Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods – Glow-wire flammability test method for end-products IEC 60695-1 1 -1 0, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical flame test methods IEC 60695-1 1 -20:1 999, Fire hazard testing – 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 – Part 7-1: Ancillary equipment – Terminal blocks for copper conductors IEC 60998-2-1 , Connecting devices for low-voltage circuits 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 for household and similar purposes – Part 2-2: Particular requirements for connecting devices as separate entities with screwless-type clamping units IEC 60999-1 :2000, Connecting devices – Electrical copper 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 mm 2 up to 35 mm 2 (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 units for conductors above 35 mm 2
3.4 spout hub open entry of a box permitting the insertion and containment of a conduit 3.5 cable anchorage ability to limit the displacement of a fitted flexible cable against pull and push forces and torques 3.6 connector for photovoltaic-systems component suitable for use in PV-systems that terminates conductors for the purpose of providing connection to and disconnection from a suitable mating component 3.7 intended use use of a junction box in accordance with the information for use provided by the manufacturer [SOURCE: IEC 60050-903:201 3, 903-01 -1 3, modified – “product, process or service” has been replaced by “junction box” and “supplier” has been replaced by “manufacturer”.] 3.8 terminal part(s) of the terminal necessary for the mechanical clamping and the electrical connection of the conductor(s), including the parts that are necessary to ensure the correct contact pressure 3.9 clearance shortest distance in air between two conductive parts [SOURCE: IEC 60050-426:2008, 426-04-1 2] 3.1 0 creepage distance shortest distance along the surface of the insulating material between two conductive parts [SOURCE: IEC 60050-1 51 :2001 , 1 51 -1 5-50, modified – “a solid” has been replaced by “the”.] 3.1 1 overvoltage category numeral defining a transient overvoltage condition