Here is a different angle.
If in the IT/Telecom datacenter, all the end equipment is running off 230V 50/60 Hz single-phase, would it be reasonable to assume that the center likely has a Transformer to bring the grid 3 phase 400V down to 230V for distibution within the facility?
This would then point my company to use the 208-250V rated IEC 309 blue connectors would it not?
