Using a 12-3 wire for a dryer is not recommended and is not the appropriate wiring for a standard electric dryer. A 12-3 wire is typically used for certain 220-volt circuits that require two hot wires, a neutral wire, and a ground wire, such as some electric stoves or air conditioners.
For a standard electric dryer, you need a 10-3 wire. This type of wire consists of three conductors: two hot wires (usually black and red), a neutral wire (usually white), and a ground wire (usually green or bare copper). The 10-3 wire is designed to handle the higher electrical load required by the dryer.
It is essential to use the correct wire size and configuration to ensure safety and proper operation of the dryer. If you are unsure about electrical wiring or installation, it's best to consult a qualified electrician to do the job to code and prevent any potential hazards.