Convert from tripple phase to 120/240

[chopficaro]

how exactly is the voltage from triple phase power lines transformed into 120/240?

 

[russ_watters]

Single phase and split phase are derived from three phase by the choice of which wires/where you connect to on the transformer. By tapping on the sides and in the center of a coil, you get split phase power: http://en.wikipedia.org/wiki/Split-phase_electric_power