Dear Jay,
you mean 240V AC 50HZ and move from 120V 60Hz? (or also 50Hz)
In US, I think everything is 60Hz. But I mean 208v single phase. (Which is what you get when you combine two 120v single phase legs out of three phase, I believe. I am not an expert on AC...)
I got the point. 120 * sqrt(3), phase to phase, three-phase current in european;
you will need to check each device if it supports 240V, commonly the specified power ratings are printed at a stricker on the device itself.
I have even been looking at USB HD AC adapter and all other odd ball equipment and I always see the label say "100~240v AC". Dell's old rack mount monitor/KB from 5 years ago even supports 208v (Just wrong connector.)
Whats the idea behind todo this? You will also need circuit breakers that both phases are switched of simultaneous? Kind regards, Ingo Flaschberger