If you lose phase A in a 120/240 singel phase three wire breaker panneland and no longer have 240volts from A to B can you back feed thru a 240 volt appliance circuit breaker like a range and put the 120 volts of phase B on to phase A and if so when you turn the range on and off will it make the lights come on and off that where on Phase A .Would the lights be in series with the range element and give a voltage reading less than the original 120 volts.please note that the pannelboard still has 120 volts from phase B to neutral it is only phase A that is opend.Thanks for your input ecvolt.Please note this question is only for trouble shoting information and is Not Intended to be a wireing Method that I would ever use
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