does anyone size wire by article 110-14c? temp limitations under 100 amps to the ampacity from the 60 degree celius column of artical 310-16 no matter what kind of wire. over 100 amps is the 75 C column.

yes

So, what are you trying to wire? And what is the ambient temperature around?

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?.
Not meaning to pin-prick.

110-14 needs to be adhered to.
The 90 deg. columns can be used for derating purposes.

I agree with the others.

If all of the involved equipment is not listed and marked otherwise, on circuits rated 100 amps or less, or marked for #14 AWG through #1 AWG conductors, you must use the ampacities listed in the 60 degree column as outlined in 110.14c1a, regardless of the temperature rating of the conductor that you are using.

Matt

Trumpy,

The word ampacity is legitimate.

The NEC defines it as : "The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating".

[This message has been edited by Matt M (edited 11-21-2002).]

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."

I usually use the 75 degree col for 75 degree wire used in feeders. The breakers at both ends are rated at 75 degrees.

Must say I agree Paul,
its a very "round" sounding word.