those tandem-paralell recepticles, do you know what they would have been used for, ive got one up here in my room/office below a window cut into the baseboard, and it reads 240v, i was thinking it was for an old window ac or somthing along those lines, but the only dp breakers in my panel is for the range and dryer, and neither of those are tapped off anywhere along their run, or in the panel
