Power Cable Derating Calculator

Calculate cable ampacity derating for temperature, conduit fill, and burial depth per NEC 310.15.

Cable ampacity from NEC Table 310.16 at 30°C.
A
Actual ambient temperature.
°C
60°C, 75°C, or 90°C insulation.
°C
Number of CCCs in conduit. 1-3: 100%, 4-6: 80%, 7-9: 70%.
Base ambient temp for table values.
°C

Results

Temperature Correction Factor-
Fill Correction Factor-
Derated Ampacity-A
Derating Percentage-%
References: NEC 310.15; NEC Tables 310.16-310.20