Not possible to have 240 to ground on B if you have 120 on A and C, the phase angles work out to 208 volts from B to ground. If you have a wye system with 120 to ground it is not possible to have anything but 208 phase to phase. Now if you have closer to 125 volts (common around here) then that high leg will run close to 216.Not 208. A-g= 120, B-g= 240, c-g=120
@aDave, thank u sir, that registered. So, regardless of B @ 240v any order of the phases still gets me at 240v, correct? Obviously not considering rotation, I know to switch out a phase/rotate..
If you had a 240 volt phase to phase wye system then the voltage to neutral would be ~139 volts.
If you were to wire a delta system that was 208 phase to phase then the A and C to neutral would be 104 and the high leg would be 180 volts to neutral.
You can't cheat the math for the phase angles, you can change some of the base voltages to different levels but all other voltages will change in the same proportions.