TOT Wire & Cable supplies high-performance THHN, THWN, and THWN-2 wire, widely used in residential, commercial, and industrial construction projects. These building wires are ideal for power distribution, branch circuits, and control wiring—designed to perform reliably in both dry and wet environments.
All our wires comply with UL 83, UL 1063, and NEC (National Electrical Code) standards.
What is THHN / THWN / THWN-2 Wire?THHN: Thermoplastic High Heat-resistant Nylon-coated. Suitable for dry locations up to 90°C.
THWN: Thermoplastic Heat and Water-resistant Nylon-coated. Rated for wet locations up to 75°C.
THWN-2: Enhanced version rated for wet or dry locations up to 90°C. Also suitable for conduits or raceways.
All three types are typically dual-rated as THHN/THWN or THWN-2.
Wire Construction Details| Component | Description |
|---|---|
| Conductor | Solid or stranded copper (per ASTM B3, B8) |
| Insulation | Heat-resistant thermoplastic (PVC) |
| Jacket | Nylon outer layer for abrasion resistance |
| Voltage Rating | 600 Volts |
| Temperature | 90°C dry / 75°C wet (THWN), 90°C wet/dry (THWN-2) |
| Color | Standard colors: Black, White, Red, Green, Blue, etc. |
Key Features
UL-listed & NEC-compliant for residential and commercial use
Excellent heat, oil, moisture, and chemical resistance
Nylon jacket offers mechanical protection and easy pulling
Available in multiple sizes: 14 AWG to 1000 MCM
Suitable for conduit installation (EMT, PVC, etc.)
ApplicationsPower distribution in buildings
Branch circuits in panels
Conduit and raceway installations
Feeders and subpanels
HVAC and lighting control systems
Common THHN / THWN Wire Sizes| Size (AWG/MCM) | Strand Type | Insulation Thickness | Ampacity (90°C) | Application |
|---|---|---|---|---|
| 14 AWG | Solid | 0.015' | 20 Amps | Lighting circuits |
| 12 AWG | Solid | 0.015' | 25 Amps | General branch circuits |
| 10 AWG | Solid | 0.020' | 35 Amps | HVAC systems |
| 1/0 AWG | Stranded | 0.055' | 150 Amps | Feeders & subpanels |
Why Choose TOT as Your THHN / THWN-2 Wire Supplier?
Factory-direct pricing with premium quality
Full size range and multiple colors available
Fast delivery for bulk orders
Custom labeling, printing, and packaging on request
Export-ready for international projects
Contact us today for a free quote, technical datasheet, or sample.
Frequently Asked QuestionsQ: What’s the main difference between THHN and THWN-2 wire?
A: THWN-2 is rated for 90°C in wet locations, while THHN is limited to 90°C only in dry areas. THWN-2 is more versatile.
Q: Is THHN wire suitable for underground use?
A: Not directly. It must be installed inside a conduit if used underground. Consider USE-2 or XHHW-2 for direct burial.
Q: Can I use THHN/THWN-2 wire in a residential project?
A: Absolutely. It's widely used for residential wiring, especially for panel feeds and conduit installations.
