Yes, you can do this. You need to purchase a new 2-pole breaker, a new L6-20 outlet, and some red electrical tape.nader wrote:Based on your other post about adapters (very helpful btw) it looks like you can convert a dedicated 120v outlet to a 240v by swapping wires to create 2 hot wires. Is that possible? I imagine there would be wiring changes at the service panel too.
First, be absolutely sure that it is a dedicated circuit! Use extreme caution!
1. Cut power to the service panel feeding the circuit.
2. Shut off and remove the original single-pole breaker (15 or 20A).
3. Locate the white neutral wire and remove it from the Neutral Bus bar.
4. Use red tape to cover the white wire so that it's now clearly red.
5. Verify power off and Remove the old outlet.
6. Tape the white wire here as well.
7. Connect and install the new 240V outlet. (Black to X, Red to Y)
8. Install the new 2-pole 15 or 20A breaker.
9. Wire the black and (now) red wires to the 2 screws on the breaker.
10. Replace the panel cover, restore power, and then turn on the new breaker.