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#17123 - 11/20/02 09:24 PM WIRE AMPACITY  
mike knight  Offline
Junior Member
Joined: Oct 2002
Posts: 5
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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#17124 - 11/20/02 11:01 PM Re: WIRE AMPACITY  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
yes


Don(resqcapt19)

#17125 - 11/21/02 01:16 AM Re: WIRE AMPACITY  
Jacuzzi Guy Electric  Offline
Member
Joined: Oct 2002
Posts: 33
Dearborn Heights Michigan Unit...
So, what are you trying to wire? And what is the ambient temperature around?


#17126 - 11/21/02 02:00 AM Re: WIRE AMPACITY  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
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 Re: WIRE AMPACITY  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
110-14 needs to be adhered to.
The 90 deg. columns can be used for derating purposes.


#17128 - 11/21/02 10:05 AM Re: WIRE AMPACITY  
Matt M  Offline
Member
Joined: Mar 2001
Posts: 93
Laporte, MN, USA
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 Re: WIRE AMPACITY  
Matt M  Offline
Member
Joined: Mar 2001
Posts: 93
Laporte, MN, USA
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 Re: WIRE AMPACITY  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
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 Re: WIRE AMPACITY  
George  Offline
Member
Joined: Feb 2002
Posts: 375
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 Re: WIRE AMPACITY  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Must say I agree Paul,
its a very "round" sounding word.



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