x2 ^^ The lightest duty AC cords can be 16 gauge but 14 is more common for medium duty. you can get a cheap extension cord at the hardware store for 3 bucks and cut to size, then you will have the proper type of wire. I wouldn't use speaker wire unless I was really in a pinch and then it would have to be the heavy duty large gauge wire. Best bet is to get some proper gauge insulated wire for the intended purpose, why invite possible issues?