SMA MULTICLUSTER BOX 36 - Manual (Page 24)

7 Electrical Connection SMA Solar Technology AG
24 MC_BOX_36-BE-en-20 Operating Manual
7.4 Inserting and Preparing the Connection Cables
Always proceed as follows to insert the connection cables of the generator, the loads, the PV plant
and the Sunny Island inverters into the Multicluster Box. Insert the control, measurement and data
cables as described in Section 7.10, page 34.
Additionally required material (not included in the scope of delivery):
☐ Terminal lugs M12 for connecting the generator, loads and PV plant
Procedure:
1. Remove the front and center sliding panels at the bottom of the Multicluster Box.
2. Select an appropriate double-membrane seal for inserting the connection cable and remove it
from the base plate.
3. Pierce the double-membrane seal with a sharp object. The opening must firmly encircle the
cable.
4. Insert the connection cable into the Multicluster Box.
5. Slide the double-membrane seal over the connection cable.
6. For connection cables of the generator, the PV plant, or the loads: press an M12 terminal lug
onto the cable.
7. Label each Sunny Island connection cable using the adhesive web included in the delivery.
8. Reinsert the double-membrane seal in the base plate.
7.5 Connecting the Generator
You can connect a three-phase generator to the Multicluster Box.
The line conductors are routed via fuse switches in the Multicluster Box. 500 A LV/HRCsize 3 fuse
links are installed in the fuse switch by default.
Cable requirements:
☐ Conductor material: copper
☐ The conductor cross-section must be selected based on the nominal power of the generator and
must not exceed 300 mm².
☐ If the generator does not have an output fuse, the connection cable must be short-circuit and
ground-fault protected.
☐ In case of long cable routes, an additional fuse box must be installed in proximity to the
generator.
☐ Line conductors, neutral conductors and grounding conductors must have the same
cross-section.
The generator output fuse influences dimensioning of the PV plant connection
cables
Remember that the size of the generator output fuse affects dimensioning of the PV plant
cable (see Section 7.7 "Connecting the PV Plant", page 29).