Split PV junction box
Enclosure of photovoltaic junction box
Why and how to achieve IP65 or IP67
The truth that PV module junction box adopts IP65 or IP67 protection level is that it can simultaneously meet the dual stringent requirements of dust and water resistance for long-term outdoor operation of the photovoltaic system.
How could it be IP65 or IP67
1. Multi-layer Sealing Material
Dual protection using silicone sealing rings and sealant creates a physical barrier at the junction between the junction box cover and the housing, ensuring complete dustproofing (Class 6). The sealing material must pass 85°C/85% RH damp heat aging testing to ensure long-term resilience.
The potted junction box uses two-component silicone to fill internal gaps, achieving a seamless seal.
2. Waterproof and Breathable Membrane
Equalizes internal and external pressure differences, preventing water vapor penetration while allowing moisture to escape, preventing condensation.
Safety requirements, constructional requirements and tests for junction boxes
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EIA-364: |
Electrical Connector/Socket Test Procedures Including Environmental Classifications |
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IEC-60512: |
Electronic Equipment - Tests and Measurements |
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IEC 60529: |
Degrees of Protection Provided by Enclosures (IP Code) |
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IEC-60695: |
Fire Hazard Testing |
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IEC 62790: |
Junction boxes for photovoltaic modules, TÜV Rheinland certificate: RXXXXXX |
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IEC 61215: |
Terrestrial Photovoltaic (PV) Modules |
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IEC-60068-2: |
Electronic Equipment & Product Standards |
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UL 1703: |
UL Standard for Safety Flat-Plate Photovoltaic Modules and Panels |
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UL 3730: |
Safety for Photovoltaic Junction Boxes, UL file: E321923-20170829 |
IP (Ingress Protection) meaning
The degree of protection is indicated in the following way: 1st charact. numeral (degree of protection against access to hazardous parts and against solid foreign objects) 2nd charact. numeral (degree of protection against ingress of water) . The following charts give an overview about all protection degrees.
1st charact. numeral
|
1st charact. numeral |
Brief description |
Definition |
|
0 |
Non-protected |
– |
|
1 |
Protected against access to hazardous parts with the back of a hand. Protected against solid foreign objects of ³50mm Ø. |
The probe, sphere of 50mm Ø, shall not fully penetrate and shall have adequate clearance from hazardous parts. |
|
2 |
Protected against access to hazardous parts with a finger. Protected against solid foreign objects of ³12.5mm Ø. |
The jointed test finger of 12mm Ø, 80mm length, shall have adequate clearance from hazardous parts. The probe, sphere of 12.5mm Ø, shall not fully penetrate. |
|
3 |
Protected against access to hazardous parts with a tool. Protected against solid foreign objects of ³2.5mm Ø. |
The probe of 2.5mm Ø shall not penetrate at all. |
|
4 |
Protected against access to hazardous parts with a wire.Protected against solid foreign objects of ³1mm Ø. |
The probe of 1mm Ø shall not penetrate at all. |
|
5 |
Protected against access to hazardous parts with a wire. Dust-protected. |
The probe of 1mm Ø shall not penetrate. Intrusion of dust is not totally prevented, but dust shall not penetrate in a quantity to interfere with satisfactory operation of the device or to impair safety. |
|
6 |
Protected against access to hazardous parts with a wire. Dust-tight. |
The probe of 1mm Ø shall not penetrate. No intrussion of dust. |
Remark: Numeral acc. to DIN 40050 part 9, vehicles IP code
2nd charact. numeral
|
2nd charact. numeral |
Brief description |
Definition |
|
0 |
Non-protected |
– |
|
1 |
Protected against vertically falling water drops |
Vertically falling drops shall have no harmful effects. |
|
2 |
Protected against vertically falling water drops when enclosure tilted up to 15° |
Vertically falling drops shall have no harmful effects when the enclosure is tilted at any angle up to 15° on either side of the vertical. |
|
3 |
Protected against spraying water |
Water sprayed at an angle up to 60° on either side of the vertical shall have no harmful effects. |
|
4 |
Protected against splashing water |
Water splashed against the enclosure from any direction shall have no harmful effects. |
|
5 |
Protected against water jets |
Water projected in jets against the enclosure from any direction shall have no harmful effects. |
|
6 |
Protected against powerful water jets |
Water projected in powerful jets against the enclosure from any direction shall have no harmful effects. |
|
7 |
Protected against the effects of temporary immersion in water |
Intrusion of water in quantities causing harmful effects shall not be possible when the enclosure is temporally immersed in water for 30 min. in 1m depth. |
|
8 |
Protected against the effects of continous immersion in water |
Intrusion of water in quantities causing harmful effects shall not be possible when the enclosure is continuously immersed in water under conditions which shall be agreed between manufacturer and user but which are more severe than for numeral 7. |
|
9 K 1) |
Protected against water during high pressure/steam jet cleaning |
Water projected in powerful jets with high pressure against the enclosure from any direction shall have no harmful effects. |
