Hi everyone! I am trying to find out what these 3-wire and 2-wire outlets and cords are in Spanish. It just appears in the user's guide of a product, like this: DO NOT Use with 2-wire extension cords or adapters It must be plugged into a properly grounded 3-wire AC outlet. (¿toma de corriente alterna con tres cables/con tres contactos?) I don't think it can be "cable de dos cables", and don't know if "cable doble" has a meaning Any help more than welcome!