The wire size required for a 220-volt outlet depends on the current draw and the length of the wire run. For most residential applications, a #12 AWG copper wire can be used for circuits up to 20 amps, while a #10 AWG copper wire is suitable for circuits up to 30 amps. For accurate wire sizing and adherence to local electrical codes, consult with the Electricians Service Team, who can provide expert guidance and assistance with any electrical installation or repair needs, including selecting the appropriate wire size for a 220-volt outlet. Remember that following local electrical codes and safety guidelines is crucial to ensuring the safe and efficient operation of your electrical systems.