THHN/THWN-2 aluminum, All Sizes
Aluminum building wire for conduit and raceways, with PVC insulation and a nylon jacket, at a lower cost per foot than copper. THHN and THWN-2 are insulation types in NEC Table 310.4(1); their ampacity comes from Table 310.16.
We list 15 sizes of THHN/THWN-2 aluminum, from 6 AWG to 750 kcmil. All of them are priced online, from $0.3977/ft. Sold by the foot in whole feet from 50 ft, or on standard spools and coils. Up to 10 colors are listed per size. Each size has its own page with the price for every color and length, the date an order placed now ships, and the full specifications.
| Product | Size | Conductors | O.D. (in) | Ampacity (A), 75 C | From $/ft |
|---|---|---|---|---|---|
| 6 AWG THHN/THWN-2 Aluminum Wire | 6 AWG | 1 | 0.239 | 50 | $0.3977 |
| 4 AWG THHN/THWN-2 Aluminum Wire | 4 AWG | 1 | 0.305 | 65 | $0.4947 |
| 3 AWG THHN/THWN-2 Aluminum Wire | 3 AWG | 1 | 0.33 | 75 | $0.4656 |
| 2 AWG THHN/THWN-2 Aluminum Wire | 2 AWG | 1 | 0.36 | 90 | $0.6208 |
| 1 AWG THHN/THWN-2 Aluminum Wire | 1 AWG | 1 | 0.413 | 100 | $0.8536 |
| 1/0 AWG THHN/THWN-2 Aluminum Wire | 1/0 AWG | 1 | 0.45 | 120 | $0.9603 |
| 2/0 AWG THHN/THWN-2 Aluminum Wire | 2/0 AWG | 1 | 0.49 | 135 | $1.13 |
| 3/0 AWG THHN/THWN-2 Aluminum Wire | 3/0 AWG | 1 | 0.537 | 155 | $1.40 |
| 4/0 AWG THHN/THWN-2 Aluminum Wire | 4/0 AWG | 1 | 0.589 | 180 | $1.56 |
| 250 kcmil THHN/THWN-2 Aluminum Wire | 250 kcmil | 1 | 0.656 | 205 | $2.02 |
| 300 kcmil THHN/THWN-2 Aluminum Wire | 300 kcmil | 1 | 0.706 | 230 | $2.39 |
| 350 kcmil THHN/THWN-2 Aluminum Wire | 350 kcmil | 1 | 0.752 | 250 | $2.16 |
| 400 kcmil THHN/THWN-2 Aluminum Wire | 400 kcmil | 1 | 0.795 | 270 | $2.73 |
| 500 kcmil THHN/THWN-2 Aluminum Wire | 500 kcmil | 1 | 0.872 | 310 | $3.44 |
| 750 kcmil THHN/THWN-2 Aluminum Wire | 750 kcmil | 1 | 1.066 | 385 | $4.87 |
The ampacity column is from NEC Table 310.16, 75 C column, for not more than three current-carrying conductors at 30 C ambient.
Code references are to the NEC; check the edition your jurisdiction has adopted and any local amendments.