COPPER BUILDING WIRE

Copper THHN/THWN-2

APPLICATION: INSULATION:
Copper THHN/THWN-2 conductors are primarily used in • Heat and moisture resistant colored polyvinyl chloride (PVC)
conduit and cable trays, when approved, for services, feeders insulation, with a clear nylon (polyamide) or UL-listed equal
and branch circuits in commercial or industrial applications as jacket, which provides abrasion resistance
specified in the National Electric Code. THHN applications are
suitable for use in dry locations only at temperatures not to STANDARDS:
exceed 90°C. THHN-2 applications are suitable for use in either
• UL 83
wet or dry applications, with temperatures that do not exceed
• UL VW-1
90°C.
• Size 1/0 & larger suitable for cable tray use
• MTW per UL 1063
CONDUCTORS: • ASTM B1, B3, B8
• Either solid or stranded soft drawn copper, per ASTM • Federal Spec A-A-59544
Standards

Conductor Net
No. of Insulation Thickness Insulation Thickness Overall Diameter Ampacity*
Part Number Size Weight
Strands
AWG/kcmil inches mm inches mm inches mm lbs/kft amps
14SOLTHHN 14 Solid 0.015 0.38 0.004 0.10 0.110 2.79 16 25
14THHN 14 19 0.015 0.38 0.004 0.10 0.120 3.05 16 25
12SOLTHHN 12 Solid 0.015 0.38 0.004 0.10 0.130 3.30 24 30
12THHN 12 19 0.015 0.38 0.004 0.10 0.140 3.56 25 30
10SOLTHHN 10 Solid 0.020 0.51 0.004 0.10 0.160 4.06 38 40
10THHN 10 19 0.020 0.51 0.004 0.10 0.170 4.32 39 40
8THHN 8 19 0.030 0.76 0.004 0.10 0.230 5.84 66 55
6THHN 6 19 0.030 0.76 0.005 0.13 0.250 6.35 98 75
4THHN 4 19 0.040 1.02 0.006 0.15 0.330 8.38 155 95
3THHN 3 19 0.040 1.02 0.006 0.15 0.360 9.14 190 115
2THHN 2 19 0.040 1.02 0.006 0.15 0.390 9.91 235 130
1THHN 1 19 0.050 1.27 0.007 0.18 0.450 11.43 300 145
1/0THHN 1/0 19 0.050 1.27 0.007 0.18 0.500 12.70 370 170
2/0THHN 2/0 19 0.050 1.27 0.007 0.18 0.540 13.72 460 195
3/0THHN 3/0 19 0.050 1.27 0.007 0.18 0.600 15.24 570 225
4/0THHN 4/0 19 0.050 1.27 0.007 0.18 0.660 16.76 710 260
250THHN 250 37 0.060 1.52 0.008 0.20 0.720 18.29 845 290
300THHN 300 37 0.060 1.52 0.008 0.20 0.766 19.46 985 320
350THHN 350 37 0.060 1.52 0.008 0.20 0.830 21.08 1,165 350
400THHN 400 37 0.060 1.52 0.008 0.20 0.864 21.95 1,296 380
500THHN 500 37 0.060 1.52 0.008 0.20 0.960 24.38 1,640 430
600THHN 600 61 0.070 1.78 0.009 0.23 1.051 26.70 1,934 475
750THHN 750 61 0.070 1.78 0.009 0.23 1.170 29.72 2,480 520
1000THHN 1000 61 0.070 1.78 0.009 0.23 1.320 33.53 3,300 615
All values are nominal and subject to correction.
#1130-01

*90°C Wet/Dry Per NEC Table 310.15 (B)(16) for not more than three conductors in raceway based on 30°C ambient temperature.

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