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Joined: Oct 2002
Posts: 5
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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.
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Joined: Nov 2000
Posts: 2,148
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Don(resqcapt19)
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Joined: Oct 2002
Posts: 33
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So, what are you trying to wire? And what is the ambient temperature around?
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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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?. Not meaning to pin-prick.
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Joined: Mar 2001
Posts: 2,056
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110-14 needs to be adhered to. The 90 deg. columns can be used for derating purposes.
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Joined: Mar 2001
Posts: 93
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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
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Joined: Mar 2001
Posts: 93
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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).]
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Joined: Aug 2001
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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."
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Joined: Feb 2002
Posts: 375
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I usually use the 75 degree col for 75 degree wire used in feeders. The breakers at both ends are rated at 75 degrees.
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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Must say I agree Paul, its a very "round" sounding word.
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Posts: 240
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