THHN/THWN-2 WIRE

THHN/THWN-2 Building Wire is a single conductor electrical wire with a PVC insulation and a nylon jacket. It is commonly used in machine tools, appliances, and home and building construction. This product is available with copper or aluminum conductors.

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THHN/THWN-2 Building Wire

THHN/THWN-2 is the most widely used general-purpose building wire for service, feeders, and branch circuits in commercial and industrial construction. "THHN" stands for Thermoplastic High Heat-Resistant Nylon-coated, while "THWN-2" indicates its certification for use in both dry and wet locations at temperatures up to 90°C. This wire features a primary insulation of tough, heat-resistant PVC topped with a slick nylon jacket, which significantly reduces friction during high-speed pulls through conduit or tubing. Available in high-conductivity copper for compact installations or lightweight 8000-series aluminum for cost-effective large-scale power distribution, THHN/THWN-2 is engineered for maximum durability, chemical resistance, and ease of installation in virtually any electrical environment.

Key Features
  • Dual-Rated Performance: Certified as both THHN (dry locations) and THWN-2 (wet or oily locations) for maximum application flexibility.
  • High-Heat Resistance: Rated for continuous operation at 90°C in both wet and dry environments, ensuring reliability under heavy electrical loads.
  • Slick Nylon Jacket: The outer nylon skin provides superior abrasion resistance and a low-friction surface for easier wire pulling through bends and long conduit runs.
  • Chemical & Oil Resistant: Specifically engineered to resist degradation from gasoline, oil, and various industrial chemicals.
  • Material Options: Offered in Soft-Drawn Copper for superior conductivity or 8000-Series Aluminum for a lightweight, economical alternative.
  • Full Compliance: Manufactured to meet UL 83, UL 1063 (MTW), and AWM specifications, and is fully compliant with NEC requirements.
Common Applications
  • Commercial Conduit Wiring: The standard choice for power and lighting circuits installed in EMT, PVC, or rigid conduit within office buildings and retail spaces.
  • Industrial Machine Tooling: Frequently used as Machine Tool Wire (MTW) for wiring automated assembly lines and heavy equipment.
  • Service Entrance Feeders: Ideal for routing power from the main service disconnect to distribution panels and sub-panels.
  • Appliance & Control Wiring: Used as internal wiring for large appliances, HVAC units, and industrial control cabinets.
  • Residential Branch Circuits: Deployed in home electrical systems for high-amperage dedicated circuits like electric vehicle (EV) chargers and water heaters.
  • Underground Raceway Systems: Rated for use in underground conduits where moisture and condensation are present.
  • Renewable Energy Projects: Often utilized in solar and wind power systems for routing power from inverters to the main electrical grid.