“The high-capacity choice for residential sub-panels and industrial machineryengineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.”

Why Electricians Choose 4 AWG THHN/THWN-2 Copper

The #4 AWG copper building wire is a powerhouse feeder. It is most commonly specified for 70-amp to 85-amp circuits, providing the necessary ampacity for detached garages, large HVAC units, and commercial motors. Our stranded version is essential at this thickness, offering the flexibility required to bend the wire into lugs and navigate tight conduit bodies.

• Dual Rated (THHN/THWN-2): Engineered for dry locations up to 90C (THHN) and wet locations (THWN-2), providing maximum versatility for indoor and outdoor conduits.

• Tough PVC/Nylon Jacket: The high-heat and moisture-resistant PVC insulation is protected by a tough, friction-reducing Nylon outer sheath, making for easier pulls through tight bends.

• High-Conductivity Copper: Manufactured with soft-annealed stranded copper to provide maximum flexibility and superior electrical conductivity for branch circuits and feeders.

• Oil & Gasoline Resistant: The specialized jacket is designed to resist chemical degradation, making it ideal for industrial environments and service station wiring.

Common 4 AWG THHN/THWN-2 Applications

• 85-Amp Sub-Panels: The go-to feeder for large residential sub-panels (85A at 75C) in ADUs, guest houses, and high-end home workshops.

• Residential Service Entrance: Frequently used in multi-conductor sets for 100-amp residential services (under certain NEC 310.12 dwelling allowances).

• Heavy Industrial Equipment: Powering large commercial air compressors, industrial weld stations, and high-capacity motors.

• Commercial Kitchen Feeders: The primary power supply for walk-in freezers and large commercial dishwasher systems.

Technical Specifications

ENGINEERING OVERVIEW: 4 AWG STR THHN 600V

• APPLICATION: Feeder wire for sub-panels, large appliances, and industrial power distribution.

• VOLTAGE: Rated for 600 Volts.

• CONDUCTORS: Stranded soft-annealed copper.

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

• JACKET: Tough, abrasion-resistant Nylon.

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

• Ampacity: 70 amps @ 60C | 85 amps at 75C | 95 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.