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Hi we are quoting for installing the main feed for a public swimming pool , its a 3 phase install with 3 no. 300 AMP main fuses . we will be installing a 315 3pn switched fused isolator then SWA on cable tray at a distance of 25 mtrs to the main board , i have allowed for 240 mm2 cable with 70 mm earth am i right or can i install smaller ???