220-volt Electrical Outlets
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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