Article 100 defines "ampacity" as the maximum current a conductor can carry continuously:

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Article 100 defines "ampacity" as the maximum current a conductor can carry continuously:

Accepted Answer

Answer: Under conditions of use, within its temperature rating
Refer: NEC Article 100
Article 100: ampacity is the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
Conditions of use include ambient temperature and the number of current-carrying conductors bundled together.
So ampacity is the current carried under conditions of use, within its temperature rating.

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