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#17123 11/20/02 09:24 PM
Joined: Oct 2002
Posts: 5
M
Junior Member
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.

#17124 11/20/02 11:01 PM
Joined: Nov 2000
Posts: 2,148
R
Member
yes


Don(resqcapt19)
#17125 11/21/02 01:16 AM
Joined: Oct 2002
Posts: 33
J
Member
So, what are you trying to wire? And what is the ambient temperature around?

#17126 11/21/02 02:00 AM
Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
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. [Linked Image]

#17127 11/21/02 07:51 AM
Joined: Mar 2001
Posts: 2,056
R
Member
110-14 needs to be adhered to.
The 90 deg. columns can be used for derating purposes.

#17128 11/21/02 10:05 AM
Joined: Mar 2001
Posts: 93
M
Member
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

#17129 11/21/02 10:50 AM
Joined: Mar 2001
Posts: 93
M
Member
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).]

#17130 11/21/02 12:26 PM
Joined: Aug 2001
Posts: 7,520
P
Member
Quote
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]

#17131 11/21/02 10:08 PM
Joined: Feb 2002
Posts: 375
G
Member
I usually use the 75 degree col for 75 degree wire used in feeders. The breakers at both ends are rated at 75 degrees.

#17132 11/23/02 10:40 PM
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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