The other old heater circuit turns out to have been run with 14/2 plus ground romex with the white wire taped red. I hope to convert this to a new 120v dedicated lighting circuit for the kitchen since the current lighting circuit is shared with the vent hood, the gas range, small appliance countertop outlets and one adjacent bedroom outlet. 3. Edit for visibility - If you have two black wires, you aren't allowed by code to repurpose a black wire to a neutral. You get 120v from 240v by using one hot and a neutral. Circuits that only need 240v like an AC can be run using only hots, but if the appliance uses 120v and 240v like a range/stove then you need three wires + ground. Step 2. Locate the 220-volt outlet to be changed. Remove the screws holding the cover over the outlet. Loosen the screws holding the wiring and outlet to the wall, and remove both. Cut the wiring next to the wall, and push any extra wire into the wall. Replace the 240V breaker with a 120V breaker, with the 15 or 20-amp rating that is correct for the new outlet. The oversize wiring running from the panel is not a problem. A pigtail at each end to bring it down to a #14 (15-amp) or #12 (20-amp) copper wire works fine. December 24, 2022 by Skystream Energy. It can cost anywhere from $50 – $200 or more to convert a 120V outlet to a 240V outlet, depending on the type of work that needs to be done. This cost includes the price of new wiring, parts, and an electrician to do the work. Additionally, the cost of labor will vary based on the area and type of job It reads, "Foreign travel AC converter input: 220/240v AC 50W output: 110/120v AC 50Hz/60Hz for electric products up to 50 watts. Radios, Walkman, calculators ,cassettes players, electric shaver, camera, strobes, recargers, AC adaptors" P=E^2/R, so the power generated in each lamp, which in an incandescent lamp. is used to cause the filament to glow, will be, relative to the power. generated when connected to 240 volts, 110^2/240^2 or 12100/57600 which is. approx 0.21. So your two lamps connected in parallel to 110 volts will. Two 120V-120V 1.5kVA isolation transformers could be used with each driven by a 120V outlet. Then the 120V secondary windings of the two transformers could be placed in series to produce 240V. GFCI's on 120V circuits should not trip because there would be negligible common-mode current drawn from their outputs because each would be feeding its cfsdd.