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    Radial circuit 2,5mm and CPC 1mm

    Hi I just found calculation examaple : "A 20A radial circuit is wired using 2.5mm sigle core PVC installed in conduit.A separate protective conductor of a 1mm cable is use. ......" My question is : Can I still use CPC 1mm and live wires as 2.5mm ? Shouldn't they be the same size 2,5mm ??
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