Even over here in New Zealand, for a large house, it would still be a 63 Amp single phase pole/pillar box fuse, this normally feeds a 16mm² Neutral Screened cable.
We have installed the odd 80 Amp single phase, with a 35mm² Neutral Screened cable.
Any loading above that will be 3 phase derived from the transformer (either pole-top or ground-mounted on the boundary), this is common in rural areas where the water extraction (well) pump is 3 phase 400V, yet you have a neutral sized for all of the single-phase loads in the house, workshop and other things.
