Perhaps, how to CHANGE a 110-volt line to carry 220 volts instead? That would involve hooking the white wire to a vertically adjacent circuit breaker, instead of having it any longer attached to the neutral bar of the breaker panel. Or perhaps. How to turn 110 volts INTO 220 volts? That would involve having the 110 volts run a step-up transformer whose output would be 220 volts. But any other way of wiring 110 to 220 sounds destructive or even dangerous.
