Ampacity Correction Factors for All Cables

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As already discussed in Ampacity of a Conductor, the ampacity of a conductor depends on temperature. Any change in ambient temperature affects the ampacity of an electrical cable. When this happens, correction factors are applied to get new ratings for such a conductor.
The approximate ampacity correction factors for all cables under different ambient temperature conditions for cables whose insulation is rated 90 degree C are given below:


Ambient Temperature  Correction Factors for Cable Insulation Rated At:
(°C) 90°C
10 1.26
20 1.18
30 1.10
40 1.00
50 0.90