Ensure disconnection time < 0.4s (for final circuits) or 5s (distribution). This may require larger CPC (circuit protective conductor) or larger line conductor.
for copper:
A cable buried underground cools differently than a cable pinned to a wooden beam or one running through a hot attic. You must identify: how to calculate cable size
The ambient temperature affects the cable's current-carrying capacity. The cable size must be adjusted to account for temperature variations. Ensure disconnection time < 0