Yes, a 10-3 wire is typically heavy enough for a dryer. The "10" in 10-3 refers to the wire gauge, and it indicates the thickness and current-carrying capacity of the wire. In this case, "10" represents a wire gauge of 10 AWG (American Wire Gauge), which is commonly used for appliances like dryers.
A 10-3 wire consists of three conductors: two hot wires (black and red) and a neutral wire (white), along with a ground wire (green or bare copper). It is commonly used for 30-amp circuits, which are suitable for most residential dryers.
However, it's important to note that electrical codes and requirements can vary depending on your location. It's always a good idea to consult local electrical codes or a qualified electrician to ensure compliance and safety when installing or modifying electrical circuits.