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Nec Cable Ampacity: copper
4/0 AWG to 900 kcmil
NEC (NFPA 70) cable ampacity ratings — allowable current for copper and aluminum conductors at 60/75/90°C insulation ratings in raceways and free air; high-temperature conductor ampacity at 150/200/250°C; ambient temperature correction factors; conductor fill adjustment factors
| conductor material | conductor size | ampacity 60C (A) | ampacity 75C (A) | ampacity 90C (A) | nec table | standard |
|---|---|---|---|---|---|---|
| copper | 4/0 AWG | 195 | 230 | 260 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 400 kcmil | 280 | 335 | 380 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 500 kcmil | 320 | 380 | 430 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 6 AWG | 55 | 65 | 75 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 600 kcmil | 350 | 420 | 475 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 700 kcmil | 385 | 460 | 520 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 750 kcmil | 400 | 475 | 535 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 8 AWG | 40 | 50 | 55 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 800 kcmil | 410 | 490 | 555 | 310.16 | NEC (NFPA 70) Table 310.16 |
| copper | 900 kcmil | 435 | 520 | 585 | 310.16 | NEC (NFPA 70) Table 310.16 |
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