Don is right, this will look exactly like a 120/240 circuit, two ungrounded conductors (any color) and a white wire plus the bare/green EGC. The switch gear will look a lot like single phase but it still needs a
delta" listing.
Jim Pauley had a great pitch on this and I was paying attention because the state did a bunch of corner ground sewer pumps.
It scares a lot of people but it is a very elegant way to serve 3 phase loads if you don't need a neutral.
