Wire Derating Calculator

Apply NEC derating factors for bundled conductors and ambient temperature.

Conductor ampacity from NEC Table 310.16.
A
Ambient temperature in °C.
°C
Conductor insulation temperature rating.
°C
Number of current-carrying conductors in raceway.

Results

Temperature Correction Factor-
Adjustment Factor-
Final Derated Ampacity-A
References: NEC Table 310.15(B)(1); NEC Table 310.15(C)(1); NEC 310.15