To a degree KY,
You will have to balance that lot over 3 phases.
It's not about loads, but line currents, with respect to the Main Neutral.
If you have everything balanced, the Neutral will carry very little current.
50A per phase here in New Zealand is a pretty normal sort of a supply to farms and houses in a rural area, (although at 230/400V)
It's all about balancing everything over the 3 phases provided.
