RE: Why choose 120 volts?

...

Oh, yeah! Nothing sounds like more fun than working in a room full of 480 or 600 delta. I LIKE neutrals. (Sort of like I like continuing to have a functioning heart.) Nobody said delta.

If you just run 7200vac into your 1u chinese made peecee servers, then you can eliminate the space use of the step-down transformer in the mechanical room.