THHN / THWN Nylon-Jacketed Wires
TFFN, THHN and THWN wires are designed for special-purpose applications requiring high heat and water resistance, with a maximum operating temperature of 105°C. The stranded conductor complies with SASO GSO IEC TR 62602. The insulation is a special heat-resistant PVC compound rated 105°C, and a nylon jacket is extruded tightly over the insulation for extra mechanical protection.
- Special heat-resistant PVC insulation rated 105°C.
- Tough nylon jacket extruded tightly over the insulation.
- Stranded copper conductor to SASO GSO IEC TR 62602.
- Ideal for high-heat, damp and special-purpose locations.
Technical Specifications
| Relevant Standard | SASO IEC 60227-3 — CU/PVC/NYLON |
|---|---|
| Conductor Material | Plain annealed copper, Class 2 (SASO GSO IEC TR 62602) |
| Insulation | PVC 105°C + nylon jacket |
| Colour Code | Red, Yellow, Blue, Black, Grey, Brown or as per customer request |
| Temperature Range | Up to 105°C |
| Conductor Resistance | According to GSO IEC TR 62602 |
| Rated Voltage | 600 V |
| Test Voltage | As per IEC 60227-3 — 2 kV |
| Packing | Wooden drums or spools |
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Standard Sizes
| AWG size | Cross-section (mm²) | Max. DC resistance @20°C (Ω/km) | PVC insulation, average thickness (mm) | Nylon jacket, minimum thickness (mm) | Overall diameter, approx. (mm) | Cable weight, approx. (kg/km) |
|---|---|---|---|---|---|---|
| 14 | 1 × 2.08 | 8.62 | 0.38 | 0.10 | 3.15 | 25 |
| 12 | 1 × 3.31 | 5.43 | 0.38 | 0.10 | 3.70 | 38 |
| 10 | 1 × 5.26 | 3.41 | 0.51 | 0.10 | 4.60 | 60 |
| 8 | 1 × 8.37 | 2.14 | 0.76 | 0.13 | 6.00 | 97 |
| 6 | 1 × 13.3 | 1.35 | 0.76 | 0.13 | 7.00 | 150 |
Diameters and weights are approximate values.
Correction factor for ambient temperature
| Ambient temperature | 25°C | 35°C | 40°C | 45°C | 50°C | 55°C | 60°C | 70°C | 80°C |
|---|---|---|---|---|---|---|---|---|---|
| Correction factor | 1.03 | 0.97 | 0.93 | 0.89 | 0.86 | 0.82 | 0.77 | 0.68 | 0.58 |
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