I recently purchased a Bandsaw that is 11amp 240v. The previous owner of my house had installed a 240v plug near the breaker panel. When I look at it, it has a 50 amp plug but the bandsaw has a 30 amp plug style on it. When I went to remove the 50 amp outlet, The black and red were in the spots for Hot 1 and Hot 2 but the white was where the green or ground should be. When I trace it back to the panel, there are two 50 amp breakers one with the red and one with the black wire. The white wire is screwed into the left side bar but I am not sure if it is a neutral or ground bar. I have included a picture of the panel. If that white wire is actually the ground, then I know how to wire in the 30 amp outlet. If not, I need help.

Am installing a outside outlet. Using pvc box. Should I seal up the lower hole or leave it open? 2. Have a speakers in carport where I work i have a radio hoked to them now. Would like to share them with a TV When either TV or radio is off. Would it hurt anything?