12 AWG THHN THWN-2 Solid Copper Building Wire

• Allowable Ampacity:

• 20 Amps at 60ºC

• 20 Amps at 75ºC

• 20 Amps at 90ºC

• Voltage Rating: 600 V

About 12 AWG THHN THWN-2

THHN stands for thermoplastic high heat-resistant nylon, one of the most versatile and durable types of building wire. Its THHN/THWN-2 dual rating means it can operate in both wet and dry environments, with the "W" indicating water resistance. The wire resists corrosion, dryness, and chemicals, operating reliably at 90°C under both wet and dry conditions.

Also Known As:

12 THHN, 12 AWG THWN-2, 12 AWG THHN, 12 Solid THHN, 12 Gauge Solid Wire, 12 Copper Wire, 12 AWG Solid Copper Wire, 12 AWG Copper Wire, 12 AWG Building Cable, 12 AWG Conduit Wire, 12 AWG Nylon Wire, 12 AWG Construction Cable, 12 AWG Thermoplastic-Insulated Copper Wire.

Why Solid Wire?

• Delivers consistent, low-resistance conductivity for fixed installations.

• Simplifies connections to outlets, switches, and breakers.

• Best suited for stable environments with minimal movement.

Common Uses for 12 AWG Solid Wire

• Standard Outlets: Common in residential wiring for wall outlets, supporting up to 20 amps.

• Lighting Circuits: Ideal for residential and commercial ceiling and wall-mounted lights.

• Conduits: Designed for structured wiring systems with straight conduit runs.

• Small Appliances: Reliable for household items such as blenders, chargers, and small electronics.

• Branch Circuits: Feeds power to outlets, lights, and switches efficiently.

• Service Entrance

Construction

Conductor

• Made of solid annealed soft copper, meeting ASTM B3 and ASTM B8 standards.

Insulation

• PVC Jacket: Flame-retardant, sunlight-resistant, and lead-free.

• Nylon Coating: Designed for abrasion resistance and easy pulls through conduits.

Standards

• ICEA S-73-532

• UL 1277: Resistant to flame, moisture, and sunlight

• UL 1581, UL 83, UL 1063, UL 758

• ASTM B3 and B8 conductor standards

• ANSI/NFPA 70: For safe electrical design and installation

• RoHS Compliant

• Exposed Run (ER): Permitted per NEC guidelines

• NEC Class I & II Systems and Division 2 Locations

Specifications

• Size AWG: 12

• Outside Diameter: 3.05 mm / 0.120 inches

• Cross Section Area: 3.31 mm²

• Insulation Thickness (PVC): 0.380 mm / 0.015 inches

• Nylon Thickness: 0.100 mm / 0.004 inches

• Weight (lbs/1,000 ft): 25