120/208VAC, three phase is typical for company switches and power distribution devices, is there any specific reason that you believe you need a 220VAC company switch?
two phase power has 4 hot wires, basically two seperate single phase windings that are in sync. Was used at the dawn of commercial power to run motors. I think niagra falls output 2 phase and I know it was used in san francisco. Most utilities have done away with it but there is a special transformer those with 2 phase equipment use to create it. Google Scott-T transformer.
two hots off a 3ph service is considered single phase. Two phase is an entire different animal. Heres a wikipedia article on it Two-phase electric power - Wikipedia, the free encyclopedia
It is considered to be bi-phase. Each hot is 120 volts to N, but only 208v is available between the hots as there is a phase lag between the hots. bi-phase - ControlBooth Single phase would provide 240 volts with a 180 degree phase relationship.
The only time a 180 degree phase relationship is found off of a three phase service is in Delta applications where one of the 240 legs is center tapped. In that application, the 120-0-120 tapped leg is single phase.
As noted in the above discussion, Wye power was used.