Now with 3p air conditioning are rotary plug, sales will generally sell, if not is bare wire, can be connected directly to the wire; as for the air switch, because the air conditioning is a high-powered appliances, in the purchase of the house, please let the workers to give you an air conditioning special, such as no, it is installed in the outlet next to the place you can with the place, you can call the installer to help, of course, is to spend money, if you don't install the air switch, according to the national standard