I'm building a display box that will house four 120V 20amp receptacles inside. I want it to be free spinning on a base plate (picture a square globe) but don't want to just hard wire them and end up having the wires come loose due to a twisted power cord inside the box. So with the limited electrical experience I have (second year IBEW apprentice) I think I want to go with carbon brushes. But do they make AC brushes? Where can I find them? Can anyone think of a better way to go about this? Thanks!