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More likely than not. Now test the voltage from the hot to that ground wire. If you get a reading then just get a regular outlet at home depot (spring for the industrial grade, they're a little beefier) and rewire. Don't forget to turn off the breakers to your room for safety.

Your assesment is correct. A surge protector works by diverting a surge to ground. The joules rating that you see is indicative of the life of the MOV's that are typically used in them. The bigger the number the greater the lifetime. I don't know what Crutchfield is getting at here but it...