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so when assessing earthing sizes which is usually half of phase conductor for main earth and then half again for bonding. on tns and tncs systems. that would equal 120mm main earth and 60mm or as close too for bonding

protect workshop circuit with 30ma rcd due to it being outside of equipotential zone far safer. if tt system earth rod would be advisable. if you live in built up area it is unlikely you have tt system.

one simple question. where is the measurement for swa csa taken from. ie a 240mm swa obvously does not have 240mm csa cores and so on with all larger swa sizes