what size wire for 15 amp circuit

For a standard 15 amp household circuit, the typical wire size is 14-gauge copper (14 AWG).

Quick Scoop

• Use 14-gauge copper wire on a 15 amp breaker for most standard home branch circuits (lighting and general receptacles).

• This matches common code practice: 15 A → 14 AWG, 20 A → 12 AWG.

• You may use thicker 12 AWG copper on a 15 A breaker if you want extra margin or future‑proofing, but never thinner than 14 AWG.

Mini Details That Matter

• Material :
  • Copper is the standard and recommended for 15 amp circuits.

* If aluminum is allowed and used, it generally must be **larger** (for example 12 AWG aluminum for a 15 A breaker), but this is not common for small branch circuits.

• Breaker must match the circuit :
  • The breaker size is set to protect the smallest wire on the circuit. So a 15 A breaker requires wire rated for at least 15 A (14 AWG copper or larger).

• Distance / voltage drop :
  • For unusually long runs, people sometimes upsize (for example from 14 AWG to 12 AWG) to reduce voltage drop, even if the breaker is still 15 A.

Common Home Rule of Thumb

• 15 amp circuit → 14 AWG copper.

• 20 amp circuit → 12 AWG copper.

If you are unsure about local code or the specifics of your run (length, aluminum vs copper, special loads), having a licensed electrician confirm the wire size and breaker pairing is the safest move.

TL;DR : For “what size wire for 15 amp circuit,” the straightforward, code‑standard answer is 14-gauge copper (14 AWG) on a 15 amp breaker.

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