12 AWG THHN Wire: Specifications, Applications, and Buying Guide

What Is 12 AWG THHN Wire?

12 AWG THHN wire is one of the most commonly used electrical conductors for residential and commercial wiring. It is a copper wire with thermoplastic insulation and a nylon jacket, designed for installation in conduits and raceways.

As part of the THHN family, it offers high heat resistance, durability, and reliable electrical performance.

Key Specifications of 12 AWG THHN Wire

Understanding the specifications is essential when selecting the right wire for electrical installations.

Wire Gauge

• 12 AWG (American Wire Gauge)

Voltage Rating

• Typically 600V

Temperature Rating

• Up to 90°C in dry locations

Conductor Type

• Copper conductor

• Available in solid or stranded versions

Insulation

• Thermoplastic insulation

• Nylon outer jacket for added protection

Ampacity of 12 AWG THHN Wire

The ampacity (current capacity) of 12 AWG THHN wire depends on installation conditions:

• 20 amps (standard residential circuits)

• May vary depending on conduit, temperature, and code requirements