Wire Gauge Calculator
Determine proper wire size per NEC ampacity tables
Load Requirements
Environmental Factors
Wire Sizing Results
Enter load current to see wire sizing results
NEC References
Table 310.15(B)(16): Ampacity ratings
Table 310.15(B)(2)(a): Temperature correction
Table 310.15(B)(3)(a): Adjustment factors
Based on 75°C conductor temperature rating. Always verify with current NEC and local codes.