THHN / THWN-2 / MTW

Application

Type THHN/THWN conductors are primarily used in conduit for services, feeder, and branch circuits in commercial or industrial applications as specified in the National Electrical Code(R).

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 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 and dry locations at temperatures not to exceed 90°C or not to exceed 75°C when exposed to oil or coolant.

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 NFPA 79).

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.

Compliances

  • UL 83 - Thermoplastic-Insulated Wires and Cables
  • CSA C22.2 No. 75-03
  • UL 1063 (MTW) - Machine-Tool Wires and Cables (stranded cables only)
  • UL 758 (AWM)
  • ICEA S-95-658/NEMA WC 70

Construction

THHN / THWN-2 / MTW THHN / THWN-2 / MTW
Conductor Soft annealed bare copper, Class B stranding per ASTM B8
Insulation Tough, heat and moisture resistant Polyvinyl chloride (PVC) insulation over which a nylon (polyamide) jacket is applied.
Color Upon request, black is preferable

Parameters

AWG or kcmil Strand Nominal Insulation thickness Nominal Jacket thickness Nominal Overall Diameter Cable weight
Inch/mm Inch/mm Inch/mm Lbs/kft kg/km
14 1 0.015 0.38 0.004 0.10 0.11 2.79 15 22
12 1 0.015 0.38 0.004 0.10 0.12 3.05 23 34
10 1 0.020 0.51 0.004 0.10 0.15 3.81 37 54
14 19 0.015 0.38 0.004 0.10 0.11 2.79 16 24
12 19 0.015 0.38 0.004 0.10 0.13 3.30 24 36
10 19 0.020 0.51 0.004 0.10 0.17 4.32 39 58
8 19 0.030 0.76 0.005 0.13 0.22 5.59 63 94
6 19 0.030 0.76 0.005 0.13 0.26 6.60 98 145
4 19 0.040 1.01 0.006 0.15 0.33 8.38 157 234
3 19 0.040 1.01 0.006 0.15 0.36 9.14 193 287
2 19 0.040 1.01 0.006 0.15 0.39 9.91 240 357
1 19 0.050 1.27 0.007 0.18 0.43 10.92 300 446
1/0 19 0.050 1.27 0.007 0.18 0.47 11.94 376 560
2/0 19 0.050 1.27 0.007 0.18 0.52 13.21 467 695
3/0 19 0.050 1.27 0.007 0.18 0.57 14.48 581 864
4/0 19 0.050 1.27 0.007 0.18 0.64 16.26 724 1077
250 37 0.060 1.52 0.008 0.20 0.69 17.53 855 1272
300 37 0.060 1.52 0.008 0.20 0.76 19.30 1022 1521
350 37 0.060 1.52 0.008 0.20 0.79 20.07 1191 1772
400 37 0.060 1.52 0.008 0.20 0.85 21.59 1345 2001
500 37 0.060 1.52 0.008 0.20 0.94 23.88 1668 2482
600 61 0.070 1.78 0.009 0.23 1.10 27.94 1994 2967
750 61 0.070 1.78 0.009 0.23 1.16 29.46 2465 3668
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