THHN Wire – Thermoplastic High-Heat-Resistant Nylon
THHN is a 600 V building wire with PVC insulation and a nylon (polyamide) jacket, commonly dual-rated as THHN/THWN-2. It’s used for feeders, branch circuits, and control wiring in conduit or raceway, with typical ratings up to 90 °C dry and 90 °C wet (when marked THWN-2).
Industry Standards & Compliance
- UL 83 — Thermoplastic-Insulated Wires & Cables (THHN/THWN-2)
- NEC Article 310 — Conductors for General Wiring
- UL Listed; RoHS Compliant
Key Features of THHN Wire
- 600 V building wire; typically dual-rated THHN/THWN-2.
- Temperature: up to 90 °C dry and 90 °C wet (when marked THWN-2).
- Copper conductor (solid or stranded, depending on gauge).
- PVC insulation with nylon jacket for abrasion and pull resistance.
- Installed in conduit or raceway; suitable for feeders, branch circuits, and control wiring.
- Broad gauge and color availability for code identification.
Common Applications
- Feeder and branch-circuit conductors
- Conduit/raceway runs in commercial and industrial buildings
- Control panels and machine wiring (dry locations)
- General building wiring where nylon-jacketed PVC is specified
Ordering THHN Wire
Choose the required AWG size, color, and put-up. If dual-rated, confirm the exact THHN/THWN-2 markings and temperature ratings on the product page or datasheet.
Need help selecting the right option? Contact our team for expert guidance.
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