600 Volt. Copper Conductor. Thermoplastic Insulation/Nylon Sheath. Heat, Moisture, Oil, and Gasoline Resistant II. Also Rated MTW and 105 °C AWM. Also Available, TFN and TEWN.
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Southwire® Type TFFN or MTW or AWM may be used as fixture wire, machine tool wiring, or appliance wiring material as specified in the National Electrical Code. Voltage for all applications is 600 volts. Allowable temperatures are as follows:

  • TFFN- Dry locations not to exceed 90°C
  • MTW- Wet locations or when exposed to oil or coolant at temperatures not to exceed 60°C
  • MTW- Dry locations at Temperatures not to exceed 90°C (with ampacity limited to that for 75°C conductor temperature per NFPA 79)
  • AWM- When rated as appliance wiring material in dry locations, conductor temperatures not to exceed 105°C
  • TEWN- Wet or dry locations conductor temperatures not to exceed 105°C


imperial metric
Select a set of products below for more information:
Size (AWG or kcmil) No. of Strands Nom. OD (mils) (mm) Insulation Thickness (mils) (mm) Jacket Thickness (mils) (mm) Nominal Total Weight (lbs/1000') (kgs/km) Allowable Ampacity
269779 18 AWG 18 AWG 1 1 80 2.04 15 0.38 7 10 6 6
269886 16 AWG 16 AWG 1 1 90 2.31 15 0.38 10 15 8 8

Standards & References

Southwire® Type TFFN or MTW or AWM complies with:

  • ASTM- All Applicable Standards
  • UL Standards 66, 758, and 1063
  • National Electrical Code, NFPA 70, 2011 Edition


Southwire® Type TFFN or MTW or AWM copper conductors are annealed (soft) copper, insulated with a tough, heat and moisture resistant polyvinyl chloride (PVC), over which a nylon (polyamide) jacket is applied. Available in black, white, red, blue, green, yellow, orange, brown, purple, gray, and pink. Some colors standard, some subject to economic order quantity.


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