In the US I can guarantee there is not a 415V transformer 'nearby'. You would have the standard 480V and as a wye connection that produces 270V between each leg and neutral.
There has been a push for 415 in US / NA data centers, usually newer builds. I have never seen it in a retrofit or old location or being pulled to someplace else.
BUT I have not looked at what is available in locations that I am not doing work in / have equipment in.
-Dave