SAJ Suntrio-TL8K - 5.5.3 Connecting the Second Protective Conductor

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5)Screw the cap nut of the cable tightly.
5.5.3 Connecting the Second Protective Conductor
If required by the installation, the earth terminal can be used to connect a second protective
conductor or as equipotential bonding.
Procedure
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of the inverter, then tighten the screw.