About 220 Volt Outlets - Modernize 220-volt outlets are the most powerful plugs that you'll find in most residential homes around the United States.These plugs are meant for ovens,dryers and other high-powered appliances that you simply can't power with a standard 110V outlet. While most NEMA outlets transfer 110 volts, larger appliances like dryers,stoves,and air conditioners require more power and use a two-phase 220-volt outlet or three-phase 200-volt outlet. 220 volts 30 amps. Wire Connections for X Y W 240 Volt Receptacle Dryer Outlets The Black Wire attaches to Outlet Terminal X The Red Wire attaches to Outlet Terminal Y The White Neutral or Green wire or Ground wire attaches to Outlet Terminal W. Commonly known as a dryer outlet.Of course,used for a clothes dryer. The 220 outlet is larger,and it's usually round and black or dark brown,not white.It can have three slots or four. Four-slot outlets have a ground wire. How many amps is 220 volts? Usually,the small outlets can handle 7 Amps.So,for a 220V conventional outlet,the most power that should be connected to it is 1540 Watts!