You are hooking up a 220v air conditioner you were told to use 10-2 wire how do you hook this up?

10-2 wire refers to 10 gauge, 2 conductor wire. Youshould use wire that is 10 gauge or larger (8 gauge, 6 gauge, 4 gauge, 2 gauge). The larger the wire, the more it will cost. most people install using the smallest size permitted, which in this case is 10 gauge. The are specifying the wire size to ensure that you do not connect the air conditioner to electric power using wire that is two small. If you are having problems with this type of question, you should consult an licensed electrician for help in connecting your air conditioner.