13
An appropriately rated over-current protection device must be used when the reverse current could exceed
the value of the maximum fuse rating of the Modules. An over-current protection device is required for each
series string if more than two series strings are connected in parallel, as illustrated in Figure 5.
6.2 Cables and wiring
These junction boxes have been designed to be easily interconnected in series for their well-connected cable
and the connector with iP67 protection grade. Each Modules has two single-conductor wires, one positive
and one negative, which are pre-wired inside the junction box. The connectors at the opposite end of these
wires allow easy series connection of adjacent Modules by firmly inserting the positive connector of a
Module into the negative connector of an adjacent Module until the connector is fully seated.
Use field wiring with suitable cross-sectional areas that are approved for use at the maximum short-circuit
current of the Modules. SFCE recommends installers use only sunlight resistant cables qualified for direct
current (DC) wiring in PV systems. The minimum wire size should be 4mm2.
Rating Required Minimum Field Wiring
Testing Standard
Wire size
Temperature Rating
TUV 2PFG 11694
4mm
²
-40
℃
to + 85
℃
Cables should be fixed to the mounting structure in such a way that mechanical damage
of the cable and/or the Modules 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
specifically designed to attach to the Modules frame. While the cables are sunlight resistant and waterproof,
where possible, avoid direct sunlight exposure and water immersion of the cables.
6.3 Connectors
Keep connectors dry and clean, and ensure that connector caps are hand tight before connecting the
Modules. Do not attempt to make an electrical connection with wet, soiled, or otherwise faulty connectors.
Avoid sunlight exposure and water immersion of the connectors. Avoid allowing connectors to rest on the
ground.