I have a 2 pronged outlet and a 2 pronged plug with a ground wire attached. The ac has a 3 pronged plug that can be plugged into the 2 prong plug. Where does the ground wire attach?

Hold up a minute, please.

What is the voltage and amperage required by the air conditioner?

What is the voltage and amperage of the receptacle.

Don's questions should be answered because this could be drawing 20 amps from a 15 amp circuit so please check. The answer to your specific question is not so easy since we really aren't sure what you are asking yet. That 2 prong plug, does it have a small clip on the side, usually greenish? Looks like this Amazon.com: Grounded Adapter-U Grounded 3 prong plugs to polarized… (http://www.amazon.com/Grounded-Adapter-U-prong-plugs-polarized/dp/B00361YROU)

Amazon.com: Grounded Adapter-U Grounded 3 prong plugs to polarized… (http://www.amazon.com/Grounded-Adapter-U-prong-plugs-polarized/dp/B00361YROU)These things are COMPLETELY useless, often dangerous, and should be against the law.

Just trying to dentify what the poster is talking about, not a recommendation by any means.

I know, I should have been clearer with my comment. Sorry.