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A dryer typically uses a 30 amp. 220 volt circuit. If the connector is a three bladed connector there is a red wire, a black wire and a white wire. The red and black wires are the hot wires and the white wire is the neutral. The 'L' shaped blade is the neutral. If the connector is a four-bladed connector there is a red wire, a black wire, a white wire and a green wire. The 'L' shape blade is the white wire and the 'U' shaped blade is the green wire. The white wire is neutral and the green wire is chassis ground to the appliance. In most residential situations the white wire and the green wire are both connected to the neutral-ground buss at the breaker box. Electrically there isn't any difference between the black wire and the red one. They both measure 110V to ground and 220v between the two. The white wire (and green wire, if there is one) must be connected both for proper operation and to avoid a 'hot chassis' situation. Mechanical connections (wire nuts or screw terminals) should be used. And in real life 110V is actually 120 V and 220V is actually 240V. Be careful! 220 is a bitch.
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