These electrical parts are needed to install a Nema 6-30R outlet, but all 240 outlet / 220 outlet electrical receptacles will basically require the same parts.

Receptacle (Your style may vary)



Plug (Will match the receptacle)



Box (to hold the receptacle inside the wall)



2 Pole Branch Circuit Breaker



Cable (Romex brand for interior walls)
Here is a romex cable that is used for the interior of residential home walls. There are local building codes that covern what types of cables you can or can't use so always make sure to follow them. I don't know how universal the building code standards are for using this cable in the interior of residential home walls but this cable is the right one to use in my city.