the power to homes is 1 phase
if lost you will have no power since both legs of 120/240 are derived from it
if you lose 1 leg of your 240
the 120 stuff on the good leg will work normally
the stuff on the bad leg won`t work at all (in theory you may have a few residual volts from the devices on the good leg, but since the n is tied to gnd likely close to 0)
niether will the 240 stuff
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