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Hi, looking at installing a sub main down to a field to supply caravan hook up points. the supplier has stated they are installing 2 x 100 amp split phase 180 degrees apart. not worked on 460v/480v split phase - my question is how do i go about sizing the neutral. i plan to run a steel wire armoured. i plan to export the 2 phases down the field. does the neutral need to carry both maximum currents, or do the phases effectively cancel each other out requiring a smaller neutral conductor? any help or where to look for guidance is kindly appreciated.