Craigslist folks have expanded.

This is 208 Y (wye)

208V-Wiring-Diagram-3-Phase-4-Wire.png

This setup supplies 3 individual 120V single phase feeds to the neutral. The disadvantage is that some equipment (mostly older) will not properly operate on only 208 having been made for 230. So this is 208 3 phase, or you can pull off 208 single phase