I'm assuming there will be dual, isolated, or triple, isolated, primary feed if available from the utility. True dual primary, the utility should be able to show statistical studies showing primary A is isolated from outages on primary B and the reverse, B is up when A is down. Then the switchboards could be 2N, able to select pri A or pri B, or 3N with available pri A, pri B, or generator. I would want to look at high resistance grounding with ground current monitoring at the N to G jumper, sources Y, loads delta, no line to neutral connected loads, at the main dual source switchboards.
Then look at the loads and see how much can be run at primary class voltage, probably 5 kV, maybe 15 kV class equipment. The chillers, the large water pumps, the floor to floor riser busway, the generators, large compressors, maybe could be all direct 5 kV native delta, making the 2N switchboards withs rows of ATS's 3 pole 3 wire 5 kV class equipment.
I would want to try to trade more copper for more insulation, more space, and much reduced arc flash potential at the switchboards.
Look at the loads and see how much you can run at 5 kV native and what is offered in the market for switchboards. I do not know where the market is relative to the choice of 5 kV or 15 kV switchboards, generators, inside per floor transformers, and loads.
I cannot imagine there are a lot of loads that can run 1 N and keep the doors open when that source is down. A high reliability system is very saleable.
