Ideally if a person could get a 240V/415V Wye setup that would be the best. Single pole breakers for each miner should be cheaper than 2-pole breakers so you get more capacity in a panel. I do not think that is a standard service size in North America though.

For a huge facility I would think the best is to go for a 347/600V wye service if it’s available. Then use step down transformers down to 120/208V for individual racks or buildings as it makes sense. More expense up front but might allow for smaller wire and breaker sizes running feeds to each subsection of the mine.

Interesting discussion! I am a ticketed electrician in Canada and have been considering how best to setup a mine from an electrical perspective.