Allowable Ampacities of Insulated Conductors
• Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).
• Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).
• Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried).
• Based on Ambient Temperature of 30°C (86°F).
| Conductor Size (AWG/KCMIL) |
60°C (140°F) TW, UF |
75°C (167°F) RHW, THHW, THW, THWN, XHHW, USE, ZW |
90°C (194°F) TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV |
| 14* | 15 | 20 | 25 |
| 12* | 20 | 25 | 30 |
| 10* | 30 | 35 | 40 |
| 8 | 40 | 50 | 55 |
| 6 | 55 | 65 | 75 |
| 4 | 70 | 85 | 95 |
| 3 | 85 | 100 | 115 |
| 2 | 95 | 115 | 130 |
| 1 | 110 | 130 | 145 |
| 1/0 | 125 | 150 | 170 |
| 2/0 | 145 | 175 | 195 |
| 3/0 | 165 | 200 | 225 |
| 4/0 | 195 | 230 | 260 |
| 250 | 215 | 255 | 290 |
| 300 | 240 | 285 | 320 |
| 350 | 260 | 310 | 350 |
| 400 | 280 | 335 | 380 |
| 500 | 320 | 380 | 430 |
| 600 | 350 | 420 | 475 |
| 700 | 385 | 460 | 520 |
| 750 | 400 | 475 | 535 |
| 800 | 410 | 490 | 555 |
| 900 | 435 | 520 | 585 |
| 1000 | 455 | 545 | 615 |
* Unless specifically permitted in 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.
See the NEC for conductor ampacities, correction factors, and conditions of use.
Updated 1/4/2022
