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As already discussed in

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:

__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 |