8 AWG THHN/THWN-2 Copper Building Wire | Stranded 600V

“The versatile standard for residential and commercial power circuits, engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.”

Why Electricians Choose 8 AWG THHN/THWN-2 Copper

The #8 AWG copper building wire is the go-to choice for high-draw branch circuits, such as electric water heaters, smaller sub-panels, and EV charging stations. Its dual rating ensures peak performance in both indoor dry locations and outdoor underground conduits.

• Dual Rated (THHN/THWN-2): Engineered for dry locations up to 90C (THHN) and wet or oily locations (THWN-2), providing maximum versatility for commercial and residential projects.

• Tough PVC/Nylon Jacket: The moisture and heat-resistant PVC insulation is protected by a slick, friction-reducing Nylon outer sheath, designed for easier pulls through long conduit runs.

• Responsive Stranded Copper: Manufactured with soft-annealed stranded copper to provide easier handling and superior electrical conductivity for tight junction box terminations.

• Chemical & Oil Resistant: The specialized jacket resists degradation from oils and chemicals, making it ideal for industrial machinery and commercial service applications.

Here are the targeted Common Applications for 8 AWG THHN/THWN-2 Copper.

Since #8 is the “heavy-hitter” of residential circuits and the starting point for small commercial feeders, these applications focus on high-amperage appliances and sub-panel installations.

Common 8 AWG THHN/THWN-2 Applications

• Electric Ranges & Cooktops: The industry standard for residential kitchen cooking appliances requiring 40-amp or 50-amp circuits.

• EV Charging Stations: A top-tier choice for Level 2 home electric vehicle chargers (like Tesla Wall Connectors) that require a 40A or 50A breaker.

• Residential Sub-Panels: Ideal for powering 40A50A sub-panels in detached garages, home workshops, or basement additions.

• Hot Tubs & Spas: Frequently used as the feeder for 240V hot tubs requiring a 50-amp GFCI-protected circuit.

• Central AC Condensers: Used as the primary power supply for large residential or light commercial air conditioning units and heat pumps.

• Heavy Workshop Machinery: Perfect for powering 240V industrial-grade tools like table saws, welders, and air compressors.

Technical Specifications

ENGINEERING OVERVIEW: 8 AWG STR THHN 600V

• APPLICATION: Used for branch circuits and feeders in residential, commercial, and industrial power distribution.

• VOLTAGE: Rated for 600 Volts.

• CONDUCTORS: Stranded soft-annealed copper.

• INSULATION: Heat and moisture-resistant PVC (Polyvinyl Chloride).

• JACKET: Clear nylon (polyamide)

• TEMPERATURE: 90C Dry (THHN), 90C Wet (THWN-2).

• Ampacity: 40 amps @ 60C | 50 amps at 75C | 55 amps at 90C

Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyers responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.