Nec Cable Ampacity: copper
310.17#500 kcmil to 4 AWG
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) | installation | nec table | standard |
|---|---|---|---|---|---|---|---|
| copper | 310.17#500 kcmil | 515 | 620 | 700 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#6 AWG | 80 | 95 | 105 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#600 kcmil | 575 | 690 | 780 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#700 kcmil | 630 | 755 | 855 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#750 kcmil | 655 | 785 | 885 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#8 AWG | 60 | 70 | 80 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#800 kcmil | 680 | 815 | 920 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
| copper | 310.17#900 kcmil | 730 | 870 | 985 | free air | 310.17 | NEC (NFPA 70) Table 310.17 |
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