4/0 THHN/THWN-2 Copper Building Wire | Stranded 600V

“The definitive standard for 250-amp industrial feeders and commercial service entrancesengineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.”

Why Electricians Choose 4/0 THHN/THWN-2 Copper

The 4/0 copper building wire is a massive conductor designed for the most demanding electrical loads. It is the primary choice for 225-amp to 250-amp commercial services, large industrial motors, and main distribution panels. At this size, our stranded construction is a necessity, providing the flexibility required to “train” the wire into large gear and land it securely in high-torque mechanical lugs.

• 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 large-diameter conduits.

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

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

Common 4/0 AWG THHN/THWN-2 Applications

• 225-Amp to 250-Amp Feeders: Used for high-capacity power distribution in large commercial and industrial facilities.

• Large Residential Services: Often used for massive estates requiring more than a standard 200-amp service.

• Data Center Backbones: Providing the primary power feed for server rooms and massive UPS systems.

• Generator Hookups: The standard for connecting large industrial or multi-family standby generators.

Technical Specifications

ENGINEERING OVERVIEW: 4/0 AWG STR 600V

• APPLICATION: Industrial service entrance conductors, heavy feeders, and large-scale 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: 230 amps at 75C | 260 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.