SMA AUTOMATIC SWITCH BOX L - Manual (Page 18)

Electrical Connection SMA Solar Technology AG
18 AS-BoxL-IEN084410 Installation Guide
5.2 Connecting the Consumer Loads
The cables of the consumer loads are led through fuse elements in the Automatic Switch Box. These
fuses protect the outgoing cables in the island grid operation from overload. Note that in island grid
operation, both the Sunny Backup and the PV system can power the loads and the upstream fuse on
the grid side has no function. Determine the required fuse size according to layout type of the cable
and installation conditions, and install the appropriate fuse plugs. The maximum useable D02 fuse
plugs with a nominal current of 63 A are included in the scope of delivery.
Cable requirements
The cable type and laying method must be suitable for the application and location of use.
Lead fuse selectivity
In unfavorable constellations (e.g. the same fuse value twice in a row), it may be impossible
to achieve selectivity between the lead fuses to be inserted and the up- or downstream
fuses. The complexity of the Sunny Backup system with several feeding sources make this
unavoidable.
Wire sleeves
When using fine-strand cables, also use wire sleeves.
This only applies to cables connected to the "F5 Backup Loads" fuse element.
Object Description Value
A Cable cross-section Max. 16 mm
2
B Strip insulation 18 - 20 mm