For the US, it looks like the current iteration of the NEMA wiring device standard {WD6-1997} does not specify AC or DC for 1-15 plugs and receptacles [simply, 125 volts, 15 amperes, 2-pole, 2-wire.]

[Linked Image from 64.146.180.232]

Note that is not the case with switches—almost all these days are marked AC only. For interrupting DC current—even a purely resistive load—it is a whole different ball game. I don’t know how that meshes with unplugging an appliance from a DC circuit. You would think that arcing could be much greater, for one because AC is momentarily zero every 8.3 milliseconds {each ½ an electrical cycle} allowing a degree of natural arc snuffing. DC does not have that luxury.




[This message has been edited by Bjarney (edited 09-16-2003).]