Looking to get my detached garage ready for my welder. I am looking to get the Powertig 250ex. I need to have a 240 outlet installed in my garage. I will have to run wire from my house to the garage, the electrical to the garage is on a 20 amp breaker. I have an unused 50 amp breaker and 12 empty spots in my box, what would be the best way to run the 240 to the garage? I want to have plenty of strength in the breakers and wiring to use the full power of the welder, for hours if need be. Only want to have to mess with the electrical once. I know electricians could wire it up, but my experience with sub contractors in my area has not been positive. I need to be able to tell them what you all say is required. Thx!