“The industrial powerhouse for main service entrancesengineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.”

Why Electricians Choose 350 MCM THHN/THWN-2 Copper The 350 MCM copper building wire is a massive conductor designed for the most demanding electrical loads. It is a go-to for 400-amp services (when paralleled) or single 310-amp industrial feeders. At this gauge, the friction-reducing nylon jacket is a critical feature, allowing these heavy conductors to slide through large-diameter conduits with significantly less resistance.

• 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 350 MCM THHN/THWN-2 Applications

• 300-Amp Feeders: The primary conductor for supplying high-amperage power to large commercial distribution boards and sub-panels.

• Industrial Switchgear: Connecting the main utility transformer to a building’s primary distribution switchgear or motor control centers.

• Major HVAC Chillers: Providing the massive power required for commercial rooftop units (RTUs) and high-rise refrigeration systems.

• Data Center Power Mains: Used in parallel sets to provide reliable, high-conductivity power to massive server farms and UPS systems.

• High-Rise Utility Rises: The go-to size for vertical power distribution in multi-story office buildings and luxury apartments.

Technical Specifications

ENGINEERING OVERVIEW: 350 MCM 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: 310 amps at 75C | 350 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.