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could someone verify a cable size for a sub mains please

The new sub main is supplying 15 new log cabins each rated at 32A also taking into account of a (63A SUPPLY TO A SMALL DWELLING)taking diversity into account and volt drop and current rating of cable i have come up with a 120mm2 swa xlpe 4 core with a 95mm cps (UNDERGROUND)

the new supply run is 110mtr

many thanks
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