220 volt outlets are typically the heaviest duty outlets you'll find in the residential home. They may actually go up to 250 volts, but all serve the same purpose: operating large appliances such as dryers, oven ranges, and refrigerators. 220-volt outlets can handle currents up to 50 amps, depending on the appliance.
220-volt receptacles will have three or four holes, or wire applications. Three-prong outlets are suited for two hot wires and a ground/neutral wire. In a four-prong receptacle the ground and neutral slots are separate. Newer dryers and ovens will have the four-prong design.
Always remember that wiring such outlets is dangerous work. ALWAYS test the outlet to make sure the power is off before attempting any work. Especially when wiring 220-volt outlets, it is safer to hire a professional electrician to do the work.
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