SMA PVO-N-20 - Manual (Page 26)

7 Electrical Connection SMA Solar Technology AG
26 PVO-BOX-IA-en-10 Installation Manual
FE Connection:
Since the SMA PV Offset Box applies a voltage against earth to the PV modules, an operational
current flows through the protective conductor of the SMA PV Offset Box. In a standard-compliant
installation, this current is not allowed to flow through a PE conductor . For this reason, you must use
an FE conductor. You can connect the FE conductor either to the substructure of the PV plant or to an
equipotential bonding busbar.
Connection Options for the Potential-Free Fault Indication Relay
You can connect a separate load optionally for fault indication or for fault-free operation. You can
connect the fault indication relays to an external voltage source or use the voltage between L and N.
Figure 10: Connection principle for operation and fault indication