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This term ampacity is rather curious, is this a commonly used term in the US?.
I assume you mean current-carrying capacity of a conductor?.
Trumpy,
Ampacity is not a term we're used to seeing in the British-influenced part of the English-speaking world, but it's used widely in the United States.

I like the term: It's a neat and much quicker way of saying "current-carrying capacity" or even "current rating." [Linked Image]