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THHN/THWN-2 Copper Wire

Take care of general purpose wiring in branch circuits, control circuits, machine tools, and appliances with THHN, the most commonly used building wire. THHN (thermoplastic high heat-resistant nylon) wire is available in a wider range of gauges and is more heat resistant..

T Thermoplastic HH High Heat-Resistent W Water Resistant N Nylon Coated

THHN/THWN-2 Copper Wire

Take care of general purpose wiring in branch circuits, control circuits, machine tools, and appliances with THHN, the most commonly used building wire. THHN (thermoplastic high heat-resistant nylon) wire is available in a wider range of gauges and is more heat resistant..

T Thermoplastic HH High Heat-Resistent W Water Resistant N Nylon Coated
Solid THHN/THWN-2
  1. Product Name
    O.D. (Inches)
    Ampacity
    Price
    Quick View
  2. O.D. (Inches): 0.101
    Ampacity : 15
    $0.14 /ft

    In Stock

  3. O.D. (Inches): 0.12
    Ampacity : 20
    $0.18 /ft.

    In Stock

  4. O.D. (Inches): 0.149
    Ampacity : 30
    $0.25 /ft.

    In Stock

Stranded THHN/THWN-2
  1. Product Name
    O.D. (Inches)
    Ampacity
    Price
    Quick View
  2. O.D. (Inches): 0.109
    Ampacity : 15
    $0.13 /ft.

    In Stock

  3. O.D. (Inches): 0.127
    Ampacity : 20
    $0.19 /ft.

    In Stock

  4. O.D. (Inches): 0.16
    Ampacity : 30
    $0.28 /ft.

    In Stock

  5. O.D. (Inches): 0.165
    Ampacity : 30
    $0.32 /ft.

    In Stock

  6. O.D. (Inches): 0.213
    Ampacity : 55
    $0.53 /ft.

    In Stock

  7. O.D. (Inches): 0.249
    Ampacity : 75
    $0.80 /ft.

    In Stock

  8. O.D. (Inches): 0.318
    Ampacity : 95
    $1.32 /ft.

    In Stock

  9. O.D. (Inches): 0.344
    Ampacity : 110
    $1.59 /ft.

    In Stock

  10. O.D. (Inches): 0.375
    Ampacity : 130
    $1.98 /ft.

    In Stock

  11. O.D. (Inches): 0.435
    Ampacity : 150
    $2.50 /ft.

    In Stock

  12. O.D. (Inches): 0.474
    Ampacity : 170
    $2.56 /ft.

    In Stock

  13. O.D. (Inches): 0.518
    Ampacity : 195
    $3.17 /ft.

    In Stock

  14. O.D. (Inches): 0.568
    Ampacity : 225
    $3.97 /ft.

    In Stock

  15. O.D. (Inches): 0.624
    Ampacity : 260
    $4.98 /ft.

    In Stock

  16. O.D. (Inches): 0.678
    Ampacity : 290
    $5.79 /ft.

    In Stock

  17. O.D. (Inches): 0.73
    Ampacity : 320
    $6.90 /ft.

    In Stock

  18. O.D. (Inches): 0.817
    Ampacity : 350
    $7.98 /ft.

    In Stock

  19. O.D. (Inches): 0.821
    Ampacity : 380
    $9.20 /ft.

    In Stock

  20. O.D. (Inches): 0.902
    Ampacity : 430
    $11.59 /ft.

    In Stock

  21. O.D. (Inches): 1.051
    Ampacity : 475
    $14.49 /ft.

    In Stock

  22. O.D. (Inches): 1.156
    Ampacity : 535
    $24.00 /ft.

    In Stock

  23. O.D. (Inches): 1.31
    Ampacity : 615
    $31.00 /ft.

    In Stock

*Ampacity of conductors are based on the National Electrical Code (NFPA 70) Table 310.15(B)(16). See 110.14(C), 240.4(D) and 310.15(B) for other limitations where applicable

THHN Wire Properties

The different letters in THHN wire denote particular properties of the cable:

T for Thermoplastic
HH for High Heat-Resistent, and
N for Nylon Coated .

For wire also rated as THWN: Thermoplastic Heat and Water Resistant Nylon Coated.

These characteristics make THHN wire an excellent choice for controlling outdoor factors that would otherwise alter the performance of wire cable. For end users, this means greater flexibility for applications like push-button stations, fire alarm controls, and temperature control systems.

Cost Effectiveness
THHN wire has grown in popularity since it is a cost effective alternative compared to other types of building wire. For indoor and outdoor applications where longevity is valued, THHN wire provides the peace of mind that contractors and homeowners demand. Because THHN wire is UL-approved for permanent installation, it is commonly used in new construction and a variety of other projects where the wire will not need to be removed.