The type of wire used for a dryer is typically a 10-gauge, 4-conductor wire. This type of wire is commonly referred to as a "10/4" wire. It consists of four insulated conductors: two "hot" wires (usually black and red), one "neutral" wire (usually white or gray), and one "ground" wire (usually green or bare copper).
The reason for the 4-conductor setup is to comply with modern electrical codes and safety standards. In the past, dryers were often connected using a 3-conductor wire without a separate ground wire. However, this older configuration has been replaced with the 4-conductor setup to provide an additional layer of safety.
The specific wire gauge and type required for a dryer installation may vary depending on the electrical code in your area and the manufacturer's specifications for your dryer model. It's crucial to adhere to these guidelines to ensure a safe and proper electrical connection. If you're unsure about the appropriate wire type or how to install a dryer properly, it's best to consult a qualified electrician to handle the installation.