That must be one helluva cable!. [Linked Image]
I would have thought that a multi-phase supply would be utilised, in a case like this, with all of the single-phase loads, spread over these accordingly?.
We don't tend to use anything larger than 25 mm2, over here in NZ, for single phase houses, but this would be a toss-up, between this and poly-phase. [Linked Image]