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Current Location: HomeWire & CableHook-Up Wire / Lead WireBuilding Wire THHN Building Wire
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THHN Building Wire

More Building Wire Options

  • RoHS Compliant THHN Wire
  • TFFN Wire and TFN Wire (Fixture Wire)
THHN Building Wire

THHN Wires in Various Sizes

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 our Blog

TFFN Vs THHN Wire

MTW Vs THHN Wire

THHN Building Wire Specs

THHN Building Wire Applications
RoHS Hook-up Wire RoHS Available — just ask your sales rep for THHN Wire RoHS Certificate!

Interested in THHN Striping? We've got you covered!

Buy THHN Wires from the Part Numbers listed below.

Part Number AWG SizeConductor StrandingNom. O.D. (in)Nom. Insul. Thick. (in)Jacket ThickApprox LBS/MFTAmpacity @ 90°C
THHN 14 1Buy Now 14 Solid 0.1020 0.015 0.004 15.00 15
THHN 14 19Buy Now 14 19/27 0.1090 0.015 0.004 16.00 15
THHN 12 1Buy Now 12 Solid 0.1190 0.015 0.004 23.00 20
THHN 12 19Buy Now 12 19/25 0.1280 0.015 0.004 24.00 20
THHN 10 1Buy Now 10 Solid 0.1610 0.020 0.004 38.00 30
THHN 10 19Buy Now 10 19/23 0.1610 0.020 0.004 38.00 30
THHN 8 19Buy Now 8 19/21 0.2130 0.030 0.005 63.00 55
THHN 6 19Buy Now 6 19/.0372 0.2490 0.030 0.005 95.00 75
THHN 4 19Buy Now 4 19/.0469 0.3180 0.040 0.006 152.00 95
THHN 3 19Buy Now 3 19/.0526 0.3460 0.040 0.006 189.00 110
THHN 2 19Buy Now 2 19/.0591 0.3780 0.040 0.006 234.00 130
THHN 1 19Buy Now 1 19/.0664 0.4350 0.050 0.007 299.00 150
THHN 1/0 19Buy Now 1/0 19/.0745 0.4740 0.050 0.007 372.00 170
THHN 2/0 19Buy Now 2/0 19/.0837 0.5180 0.050 0.007 462.00 195
THHN 3/0 19Buy Now 3/0 19/.0940 0.5680 0.050 0.007 575.00 225
THHN 4/0 19Buy Now 4/0 19/.1055 0.6240 0.050 0.007 718.00 260
THHN 250 37Buy Now 250 37/.0822 0.6780 0.060 0.008 851.00 290
THHN 300 37Buy Now 300 37/.0822 0.7300 0.060 0.008 1012.00 320
THHN 350 37Buy Now 350 37/.0973 0.7770 0.060 0.008 1174.00 350
THHN 400 37Buy Now 400 37 0.8210 0.060 0.008 1334.00 380
THHN 500 37Buy Now 500 37 0.9020 0.060 0.008 1655.00 430
THHN 600 61Buy Now 600 61 0.9980 0.070 0.009 1987.00 475
THHN 750 61Buy Now 750 61 1.1260 0.070 0.009 2464.00 535
THHN 1000 61Buy Now 1000 61 1.2750 0.070 0.009 1275.00 615
Return to Building Wire

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 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

THHN Wire Specifications:

  • Conductor: Bare Copper, Soft Drawn
  • Insulation: Polyvinylchloride (PVC)
  • Jacket: Nylon
  • 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), Gray (-8), White (-9), Pink (-10), Tan (-11); Striping and Other colors available upon request.
  • Gasoline & oil resistant - Type MTW 90°C Machine Tool Wire (stranded only) 105°C AWM, 80°C when exposed to oil.

THHN Wire Ratings:

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

THHN Wire Printing:

  • 14 - 10 AWG (solid conductors): "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"
  • 14 AWG - 750 KCMIL (stranded): "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.

Customization Services for THHN Wire include:      

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