Sample data from Engineering Database — 375 reference tables, deterministic calculators, and Engineering AI. Sign up free
Nec Cable Ampacity: correction ambient temp
58 to 83
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 | ambient temp C | factor 75C | factor 90C | nec table | standard |
|---|---|---|---|---|---|---|
| correction ambient temp | 58 | 58 | 0.58 | 0.71 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
| correction ambient temp | 63 | 63 | 0.47 | 0.65 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
| correction ambient temp | 68 | 68 | 0.33 | 0.58 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
| correction ambient temp | 73 | 73 | — | 0.5 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
| correction ambient temp | 78 | 78 | — | 0.41 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
| correction ambient temp | 83 | 83 | — | 0.29 | 310.15(B)(1) | NEC (NFPA 70) Table 310.15(B)(1) |
What else is in Engineering Database
Iron Engine ↗Engineering AI at ironengine.ai
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculators