THHN / THWN-2 / MTW
Applications
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®.
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.
Standards
BS 7629-1
Construction
| 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. |
Colour Code
upon request, black is preferable
Physical and thermal properties
- 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
Dimensions and Weight
| AWG or kcmil | Strand | Nominal Insulation thickness Inch/mm | Nominal Jacket thickness Inch/mm | Nominal Overall Diameter Inch/mm | Cable weight 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 |
If you have any questions please contact us.