THHN Building Wire

THHN wire is a very popular type of building wire used in all types of industrial, commercial and residential construction. This type of building wire is effective in damp and dry locations. THHN stands for Thermoplastic High Heat Nylon which is a description of the wire jacket and insulation components. The conductor comes in many strands for anything over 10 gauge in the stranded or solid conductor for gauges 14-10. THHN wire has an advantage as build wire because of its ability to handle up to 600 volts which covers most common appliances.  The installation of THHN as building wire will fall within most building codes set out in the list of National Electrical Codes. This wire has a thermoplastic jacket releases toxic gases when burned. It cannot be used outside or buried due to its minimal protection. This is because this wire is used in building conditions where very little can hurt it. The jacketing protection is abrasion resistance but has little else in means of wire protection.

Learn More about THHN Wire in the Allied University

TFFN Vs THHN Wire

MTW Vs THHN Wire

24 items

  • THHN 14 1
    $0.00 / 100 FT
    • Ampacity (90C): 15
    • Approx LBS/MFT: 15.00
    • AWG Size: 14
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  • THHN 14 19
    $0.00 / 100 FT
    • Ampacity (90C): 15
    • Approx LBS/MFT: 16.00
    • AWG Size: 14
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  • THHN 12 1
    $0.00 / 100 FT
    • Ampacity (90C): 20
    • Approx LBS/MFT: 23.00
    • AWG Size: 12
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  • THHN 12 19
    $0.00 / 100 FT
    • Ampacity (90C): 20
    • Approx LBS/MFT: 24.00
    • AWG Size: 12
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  • THHN 10 1
    $0.00 / 100 FT
    • Ampacity (90C): 30
    • Approx LBS/MFT: 38.00
    • AWG Size: 10
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  • THHN 10 19
    $0.00 / 100 FT
    • Ampacity (90C): 30
    • Approx LBS/MFT: 38.00
    • AWG Size: 10
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  • THHN 8 19
    $0.00 / 50 FT
    • Ampacity (90C): 55
    • Approx LBS/MFT: 63.00
    • AWG Size: 8
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  • THHN 6 19
    $0.00 / 50 FT
    • Ampacity (90C): 75
    • Approx LBS/MFT: 95.00
    • AWG Size: 6
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THHN Wire Applications

  • THHN electrical wire is meant for use as general-purpose wiring for installation in conduit or other recognized raceway. THHN wire may also be used for machine tool, appliance, and control circuit wiring. Read on below for THHN wire specs.

THHN Wire Specifications:

Conductor Bare Copper, Soft Drawn
Insulation Polyvinylchloride (PVC)
Jacket Nylon
AWM 1316 to 1321

Standard Colors (denoted by a dash and number code following the part number below): Black (-0), Brown (-1), Red (-2), Orange (-3), Yellow (-4), Green (-5), Blue (-6), Violet (-7), Grey (-8), White (-9), Pink (-10), Tan (-11); Striping and other colors available upon request

THHN Wire Ratings:

  Oil Wet Dry Voltage
THHN-THWN 75°C 75°C 90°C 600V
THWN-2 75°C 90°C 90°C 600V
MTW 60°C 60°C 90°C 600V
AWM 1316 to 1321 80°C --- 105°C 600V
AWM 1408 to 1414 60°C 60°C 90°C 600V
AWM 1452 to 1453 80°C --- 90°C 600V
T90 NYLON 60°C --- 90°C 1000V
TWN 75 --- 75°C --- 600V

THHN Wire Printing:

Solid Conductors: 14 - 10 AWG AWG Type THHN or THWN GASOLINE AND OIL RES II 600V (UL) or AWM VW-1--C-UL Type T90 NYLON or TWN 75 FT-1"
Stranded Conductors: 14 AWG - 750 KCMIL "AWG Type MTW or THHN or THWN or GASOLINE AND OIL RES II 600V (UL) or AWM--C-UL Type T90 Nylon or TWN 75." "VW-1"
and "FT1" on 14 - 6 AWG
and "for CT USE SUN RES" on 1/0 AWG and larger in black
"THWN-2" on 8 AWG and larger

THHN Wire Approvals:

  • UL listed Stds. 83 & 1063 as: Type THHN Wire 90°C in dry locations, Type THWN Wire 75°C in wet locations.
  • A-A-59544, NEMA WC-5, UL-758
  • CSA approval upon request

RoHS Available — just ask your sales rep for a RoHS Certificate!