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not less than 4 mm². The insulation type should be appropriate for the type of installation method
used and must meet IEC 61730 and Safety Class II requirements.
Insulation level: 1,8 kV (conductor-conductor);
Temperature: -40°C up to +90°C at least;
Construction of conductor: tinned stranded copper wire with copper purity greater than 99,9%;
Primary insulation: cross-linked polyethylene (XLPE), sunlight and moisture resistant, flame
retardant. Suitable for conduit and raceways installed underground;
Insulation (jacket): thermoplastic, sunlight resistant, flame retardant, water resistant.
Minimum cable outer diameter with insulation – 5,2 mm.
Minimum conductor cross-section – 4 mm².
SoliTek recommends installers use only sunlight resistant cables qualified for direct current (DC)
wiring in PV systems. Cables should be fixed to the mounting structure in such a way that mechanical
damage of the cable and/or the module is avoided. Do not apply stress to the cables. For fixing, use
appropriate means, such as sunlight resistant cable ties and/or wire management clips. While the
cables are sunlight resistant and waterproof, where possible, avoid direct sunlight exposure and
water immersion of the cables.
Standard length of cables from the junction boxes is 1,2 m. It is intended that two panels would
interconnect in the system.
4.5 Grounding
Functional grounding is not foreseen for SOLID modules. If it is performed, local electric codes and
regulations must be observed and used grounding means have to be isolated from live parts by
reinforced insulation. Safety grounding must be performed accordingly.
4.5.1 SOLID Framed series modules grounding
For SOLID Framed series of PV panels grounding has to be assured by connecting module frame to
the grounding structure. Observe all local electric codes and regulations. A bolted connection is
required, it incorporates:
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