For a typical modern electric dryer on a 240‑volt, 30‑amp circuit, the standard wire size is 10 AWG copper on a dedicated 4‑wire circuit (two hots, neutral, ground) with a 30‑amp double‑pole breaker and a NEMA 14‑30 outlet.

Quick Scoop

  • Most residential electric dryers:
    • 240 V, 30 A circuit → 10/3 copper cable with ground (10 AWG conductors).
  • Larger or high‑amp dryers:
    • 40 A → typically 8 AWG copper.
* 50 A → typically **6 AWG copper**.
  • If aluminum wire is used (less common indoors):
    • 30 A → 8 AWG aluminum.
* 40 A → **6 AWG aluminum**.

* 50 A → **4 AWG aluminum**.
  • Compact / gas dryers (120 V only):
    • Often on a 15–20 A, 120 V circuit → 14–12 AWG copper (commonly 12 AWG with 20 A breaker).

Why wire size matters

Using wire that’s too small for the breaker and dryer load can cause the wire to overheat and become a fire hazard; that’s why most 30‑amp electric dryers are matched with 10‑gauge copper wire by code tables and manufacturer specs.

Simple rule of thumb (electric dryers)

  • Check the nameplate/label on your dryer for amperage (A).
  • Match to minimum copper wire size:
    • 30 A → 10 AWG
    • 40 A → 8 AWG
    • 50 A → 6 AWG

Safety note

Always verify:

  • The dryer’s manual and rating label.
  • Local electrical code and permit requirements.
  • That the breaker size, wire gauge, and receptacle rating all match (e.g., 30 A breaker + 10 AWG wire + NEMA 14‑30 outlet).

If you tell me whether your dryer is electric or gas and what its amp rating is (from the label), I can suggest the specific wire and cable type (for example: “use 10/3 NM‑B copper with ground for a 30 A indoor run”).

Information gathered from public forums or data available on the internet and portrayed here.