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THHN | THWN | THWN-2 |
T = Thermoplastic | T = Thermoplastic | T = Thermoplastic |
HH = High Heat Resistance | H = Heat Resistance | H = Heat Resistance |
W = Water Resistance | W = Water Resistance | |
N = Nylon Coating | N = Nylon Coating | N = Nylon Coating |
Temperature Rating = 90°C (Dry) | Temperature Rating = 90°C (Dry), 75°C (Wet) | Temperature Rating = 90°C (Dry & Wet) |
Size AWG /Kcmil | Number of strands (Nos) | Min. Average Insulation | Min. Jacket | Overall | Max. DC resistance at 20C (Ω/km) | ||||
Thickness | Thickness | Diameter | |||||||
mil | mm | mil | mm | mm | |||||
14 | 1 | 15 | 0.38 | 4 | 0.1 | 2.6 | 8.45 | ||
12 | 1 | 15 | 0.38 | 4 | 0.1 | 3 | 5.31 | ||
10 | 1 | 20 | 0.51 | 4 | 0.1 | 3.8 | 3.34 | ||
14 | 19 | 15 | 0.38 | 4 | 0.1 | 2.9 | 8.62 | ||
12 | 19 | 15 | 0.38 | 4 | 0.1 | 3.4 | 5.43 | ||
10 | 19 | 20 | 0.51 | 4 | 0.1 | 4.3 | 3.41 | ||
8 | 19 | 30 | 0.76 | 5 | 0.13 | 5.6 | 2.14 | ||
6 | 19 | 30 | 0.76 | 5 | 0.13 | 6.6 | 1.35 | ||
4 | 19 | 40 | 1.02 | 6 | 0.15 | 8.3 | 0.848 | ||
3 | 19 | 40 | 1.02 | 6 | 0.15 | 9 | 0.673 | ||
2 | 19 | 40 | 1.02 | 6 | 0.15 | 9.8 | 0.534 | ||
1 | 19 | 50 | 1.27 | 7 | 0.18 | 11.3 | 0.423 | ||
1/0 | 19 | 50 | 1.27 | 7 | 0.18 | 12.1 | 0.335 | ||
2/0 | 19 | 50 | 1.27 | 7 | 0.18 | 13.2 | 0.266 | ||
3/0 | 19 | 50 | 1.27 | 7 | 0.18 | 14.4 | 0.211 | ||
4/0 | 19 | 50 | 1.27 | 7 | 0.18 | 15.8 | 0.167 | ||
250 | 37 | 60 | 1.52 | 8 | 0.2 | 17.6 | 0.142 | ||
300 | 37 | 60 | 1.52 | 8 | 0.2 | 18.9 | 0.118 | ||
350 | 37 | 60 | 1.52 | 8 | 0.2 | 20.1 | 0.101 | ||
400 | 37 | 60 | 1.52 | 8 | 0.2 | 21.3 | 0.0885 | ||
500 | 37 | 60 | 1.52 | 8 | 0.2 | 23.6 | 0.0709 | ||
600 | 61 | 70 | 1.78 | 9 | 0.23 | 26 | 0.059 | ||
750 | 61 | 70 | 1.78 | 9 | 0.23 | 28.6 | 0.0472 | ||











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