A 12/2 marking indicates 12-gauge wire strands. A wire marked 14/2 NM-B with ground contains two insulated strands of 14-gauge wire and an uninsulated strand inside of a non-metallic shield. A 20-amp device needs at least 12-gauge wire. A 15-amp outlet or switch requires at least 14-gauge wire. Identify and purchase the correct wire type and size.Three-way switches also require a "Traveler" wire, which lets both 3-way switches work together. A standard switch should break the live wire.
Normally the wire with the black insulation attaches to an outlet's "Hot" or "Live" terminals, and the white insulated wire connects to the neutral side. The new outlet or switch's wire connections will mimic the original. (Labeling helps keep the wires straight while working on complicated circuits, especially GFCI outlets.) A GFCI outlet uses "Line" and "Load" terminals, and the wire set from the circuit breaker must connect to the "Line" terminals.
Hold one probe on the ground wire and press the other probe against each wire terminal. Use a multimeter set to its VAC position to double-check the circuit for voltage.Loosen the mounting screws and carefully pull the device out of its electrical box without touching the wire terminals.Remove the switch or outlet's wall plate.
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