SMA AUTOMATIC SWITCH BOX M - Manual (Page 24)

Electrical Connection SMA Solar Technology AG
24 AS-BoxM-IEN091711 Installation Guide
5.5 Connecting the Consumption Meter
DANGER!
Risk of lethal electric shock!
Residual current devices (RCD) between grid and Automatic Switch Box would lose their
protective function due to the Backup System.
• Do not connect a residual current device (RCD) between grid and Automatic Switch
Box.
• Do connect a residual current device (RCD) between loads and Automatic Switch
Box.
DANGER!
Risk of death from feedback of the Sunny Backup system into the public grid.
In case of backup, feedback into the public grid can occur through the backup phase and
the 3-phase loads.
Feeding of the PV system and potentially from the diesel generator only occurs at phase L1
in case of grid failure.
• When connecting 3-phase loads whose coils or resistors are switched in a triangle,
always connect all three phases to the Automatic Switch Box.
DANGER!
Risk of lethal electric shock!
The Sunny Backup system requires a grounded neutral conductor in order to form a TN
grid in case of grid failure and be able to apply the corresponding protective measures.
• Do not install any switching elements in the grounded neutral conductor to the
Automatic Switch Box.
DANGER!
Risk of lethal electric shock!
• Connect the PEN conductor on the grid side within the house connection box to
protective earth.
Example: Connection from house connection box to the equipotential bonding bar.