User Manual 5 Electrical Connection
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* The second PE conductor should be of the same cross-sectional area as the
original PE conductor in the AC connector. The cable and cable socket are not
included in the delivery scope.
5.3 Grid Connection
The inverter is connected to the grid via 3 wires (L, N and PE).
Inverter is equipped with the waterproof direct plug-in connector which matches
the AC terminal at the bottom of the inverter.
5.3.1 AC Side Requirements
AC Circuit Breaker
An independent two-pole AC circuit breaker for the inverter must be installed at
the output side for safe disconnection. The recommended specifications are as
follows:
SG2K-S / SG2K5-S / SG3K-S / SG3K-D
In PV systems with multiple inverters, protect each inverter with a
separate circuit breaker. This will
prevent any residual voltage from
being present at the corresponding cable after disconnection.
Residual Current Device
With an integrated universal current-sensitive residual current monitoring unit
inside, the inverter will disconnect immediately from the mains power as soon
as a fault current with a value exceeding the limit has been detected.
However if an external residual current device (RCD) is mandatory, the switch
must be triggered at a residual current of 300 mA or higher.
AC Cable Requirements
The recommended specifications are shown in the following table
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