Note that this is specifically for a 120V system where instead of a single hot and a neutral, you have two hot wires, each at 60V to ground and running 180 degrees out of phase. Similar to how 240V receptacles are wired in residential.

For commercial buildings, the common layout to run a "computer" circuit with a dedicated ground and neutral, while sharing them between multiple other circuits for general loads. There are a lot of variations on this sort "isolated circuit" setup, and it's pretty much standard practice. I couldn't say how much most computers and other loads actually care that they share a noisy neutral, but I did have one personal experience with a building where an Xbox 360 couldn't get past a game's first loading screen because the power was so dirty.

For some examples, see the options listed on page 2 and wiring diagrams on page 3 here: http://www.electri-cable.com/v/vspfiles/download/Electri-Pak...