The cable to port 230 should have min 2mm5^2 due to the large number of devices (receivers) are connected to the relays (for total power control devices in this segment of less than 2kW) .

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Thecabletoport230shouldhavemin2mm5^2duetothelargenumberofdevices(receivers)areconnectedtotherelays(fortotalpowercontroldevicesinthissegmentoflessthan2kW).