Installation and Operating Instructions V02
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5.2 System layout of units without integrated DC switch
Local standards or codes may require that PV systems are fitted with an external
DC switch on the DC side. The DC switch must be able to safely disconnect the
open-circuit voltage of the PV array plus a safety reserve of 20%.
Install a DC switch to each PV string to isolate the DC side of the inverter. We
recommend the following electrical connection:
Risk of injury due to electric shock
• The external protective grounding conductor is connected to the
inverter’s protective grounding terminal through the screw terminal
block. Make sure the connection is reliable.
• When connecting, connect the AC connection first to ensure the
inverter grounding reliably and then connect the DC inputs.
• When disconnecting, disconnect the DC inputs first and then
disconnect the AC connection.
• Don’t connect the DC inputs while the AC connection is disconnected
under any circumstances.
• All electrical installations must be done in accordance with the
National Wiring Rules Standards and Local Code.
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