240 V Wiring
240–volt outlets use two 120-volt wires simultaneously, plus a neutral wire to power a single receptacle. Older homes and appliances may use three-prong 240–volt
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No matter what appliance you are wiring for, any 220 circuit has three elements: 1) The breaker panel connections. 2) The supply wire. 3) The terminal connection, which can be either a special receptacle or a direct connection to an appliance.