Applications
Type THHN / MTW / THWN-2 / T90 Copper conductor are primarily used in conduit for services, feeder, and branch circuits in commercial or industrial applications as specified in the National Electrical Code. When used as type THHN, conductor is suitable for use in dry locations at temperatures not to exceed 90 °C.
When used as type THWN, conductor is suitable for use in wet or dry locations at temperatures not to exceed 90 °C dry locations or 75 °C wet locations or not to exceed 75 °C when exposed to oil or coolant.
When used as type THWN-2, conductor is suitable for use in wet or dry locations at temperatures not to exceed 90 °C both dry and wet locations or not to exceed 75 °C when exposed to oil orcoolant.
When used as type MTW conductor is suitable for use in wet locations or when exposed to oil or coolant at temperatures not to exceed 60 °C or dry locations at temperatures not to exceed 90 °C (with ampacity limited to that for 75 °C conductors per NFPA79).
Conductor temperatures not to exceed 105 °C in dry locations when rated AWM and used as appliance wiring material. Voltage rating for all applications is 600 volts.
Type THHN / MTW / THWN-2 / T90 Copper Conductor
Construction
Type THHN or THWN or MTW are copper conductors that are soft annealed copper, insulated with a tough, heat and moisture resistant, lead-free polyvinyl chloride (PVC) over which a nylon (polyamide) or UL listed equivalent jacket is applied. 6 AWG and larger are made with a friction reducing nylon.
Available in black, white, red, blue, green, yellow, brown, orange, purple, pink, or gray.
Specifications
Type THHN or THWN or MTW (also AWM) meets or exceeds all applicable ASTM Specifications, UL Standard 83, UL Standard 1063 (MTW), UL Standard 758 (AWM), Federal Specification A-A-59544, NEMA WC 70/ICEA S-95-658 and the requirements of the National Electrical Code® (NFPA70).
Technical Data
*14 AWG – 10 AWG also available in solid conductors
| Size (AWG or KCMIL) | No. of Strands | PVC Insulation Thickness (Conductor) | Nylon Jacket Thickness | Outside Diameter | Approximate Net Weight | Allowable Ampacity (Amps) |
|---|---|---|---|---|---|---|
| 14* | 19 | 0.015 in (0.38 mm) | 0.004 in (0.10 mm) | 0.109 in (2.77 mm) | 16 lbs/1,000ft (25 kg/km) | 60ºC - 15 / 75ºC - 20 / 90ºC - 25 |
| 12* | 19 | 0.015 in (0.38 mm) | 0.004 in (0.10 mm) | 0.128 in (3.25 mm) | 23 lbs/1,000ft (36 kg/km) | 60ºC - 20 / 75ºC - 25 / 90ºC - 30 |
| 10* | 19 | 0.020 in (0.51mm) | 0.004 in (0.10 mm) | 0.161 in (0.10 mm) | 38 lbs/1,000ft (57 kg/km) | 60ºC - 30 / 75ºC - 35 / 90ºC - 40 |
| 8 | 19 | 0.030 in (0.76 mm) | 0.005 in (0.13 mm) | 0.213 in (0.13 mm) | 62 lbs/1,000ft (94 kg/km) | 60ºC - 40 / 75ºC - 50 / 90ºC - 55 |
| 6 | 19 | 0.030 in (0.76 mm) | 0.005 in (0.13 mm) | 0.249 in (0.13 mm) | 94 lbs/1,000ft (141 kg/km) | 60ºC - 55 / 75ºC - 65 / 90ºC - 75 |
| 4 | 19 | 0.040 in (1.02 mm) | 0.006 in (0.15 mm) | 0.318 in (0.15 mm) | 153 lbs/1,000ft (228 kg/km) | 60ºC - 70 / 75ºC - 80 / 90ºC - 95 |
| 3 | 19 | 0.040 in (1.02 mm) | 0.006 in (0.15 mm) | 0.346 in (0.15 mm) | 189 lbs/1,000ft (281 kg/km) | 60ºC - 85 / 75ºC - 100 / 90ºC - 115 |
| 2 | 19 | 0.040 in (1.02 mm) | 0.006 in (0.15 mm) | 0.378 in (0.15 mm) | 233 lbs/1,000ft (348 kg/km) | 60ºC - 95 / 75ºC - 115 / 90ºC - 130 |
| 1 | 19 | 0.050 in (1.27 mm) | 0.007 in (0.18 mm) | 0.435 in (0.18 mm) | 298 lbs/1,000ft (445 kg/km) | 60ºC - 110 / 75ºC - 130 / 90ºC - 145 |
| 1/0 | 19 | 0.050 in (1.27 mm) | 0.007 in (0.18 mm) | 0.474 in (0.18 mm) | 372 lbs/1,000ft (554 kg/km) | 60ºC - 125 / 75ºC - 150 / 90ºC - 170 |
| 2/0 | 19 | 0.050 in (1.27 mm) | 0.007 in (0.18 mm) | 0.518 in (0.18 mm) | 462 lbs/1,000ft (687 kg/km) | 60ºC - 145/ 75ºC - 175 / 90ºC - 195 |
| 3/0 | 19 | 0.050 in (1.27 mm) | 0.007 in (0.18 mm) | 0.568 in (0.18 mm) | 572 lbs/1,000ft (851 kg/km) | 60ºC - 165 / 75ºC - 200 / 90ºC - 225 |
| 4/0 | 19 | 0.050 in (1.27 mm) | 0.007 in (0.18 mm) | 0.624 in (0.18 mm) | 712 lbs/1,000ft(1059 kg/km) | 60ºC - 195 / 75ºC - 230 / 90ºC - 260 |
| 250 | 37 | 0.060 in (1.52 mm) | 0.008 in (0.20 mm) | 0.678 in (0.20 mm) | 849 lbs/1,000ft (1266 kg/km) | 60ºC - 215 / 75ºC - 255 / 90ºC - 290 |
| 300 | 37 | 0.060 in (1.52 mm) | 0.008 in (0.20 mm) | 0.730 in (0.20 mm) | 1010 lbs/1,000ft (1503 kg/km) | 60ºC - 240 / 75ºC - 285 / 90ºC - 320 |
| 350 | 37 | 0.060 in (1.52 mm) | 0.008 in (0.20 mm) | 0.777 in (0.20 mm) | 1170 lbs/1,000ft (1741 kg/km) | 60ºC - 260 / 75ºC - 310 / 90ºC - 350 |
| 400 | 37 | 0.060 in (1.52 mm) | 0.008 in (0.20 mm) | 0.821 in (0.20 mm) | 1330 lbs/1,000ft (1979 kg/km) | 60ºC - 280 / 75ºC - 335 / 90ºC - 380 |
| 500 | 37 | 0.060 in (1.52 mm) | 0.008 in (0.20 mm) | 0.902 in (0.20 mm) | 1650 lbs/1,000ft (2455 kg/km) | 60ºC - 320 / 75ºC - 380 / 90ºC - 430 |
| 600 | 61 | 0.070 in (1.78 mm) | 0.009 in (0.23 mm) | 1.051 in (0.23 mm) | 2019 lbs/1,000ft (3004 kg/km) | 60ºC - 350 / 75ºC - 420 / 90ºC - 475 |
| 750 | 61 | 0.070 in (1.78 mm) | 0.009 in (0.23 mm) | 1.156 in (0.23 mm) | 2466 lbs/1,000ft (3670 kg/km) | 60ºC - 400 / 75ºC - 475 / 90ºC - 535 |