Ampacity Calculator
Calculate maximum current-carrying capacity for wire gauges
Input Parameters
How It Works
Ampacity is the maximum current a wire can safely carry without exceeding its temperature rating. Factors affecting ampacity include:
- • Wire gauge (cross-sectional area)
- • Ambient temperature and derating factors
- • Installation method (bundled, conduit, free air)
- • Insulation temperature rating
- • Number of current-carrying conductors
Ampacity Reference (75°C Conductor)
| AWG | 60°C Insulation | 75°C Insulation | 90°C Insulation |
|---|---|---|---|
| 14 | 15A | 20A | 25A |
| 12 | 20A | 25A | 30A |
| 10 | 30A | 35A | 40A |
| 8 | 40A | 50A | 55A |
*Based on NEC Table 310.16. Apply temperature and bundling correction factors as needed.