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#17123 - 11/20/02 05:24 PM WIRE AMPACITY
mike knight Offline
Junior Member

Registered: 10/11/02
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 07:01 PM Re: WIRE AMPACITY
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
yes
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Don(resqcapt19)

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#17125 - 11/20/02 09:16 PM Re: WIRE AMPACITY
Jacuzzi Guy Electric Offline
Member

Registered: 10/25/02
Posts: 33
Loc: Dearborn Heights Michigan Unit...
So, what are you trying to wire? And what is the ambient temperature around?

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#17126 - 11/20/02 10:00 PM Re: WIRE AMPACITY
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: 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.
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#17127 - 11/21/02 03:51 AM Re: WIRE AMPACITY
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
110-14 needs to be adhered to.
The 90 deg. columns can be used for derating purposes.

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#17128 - 11/21/02 06:05 AM Re: WIRE AMPACITY
Matt M Offline
Member

Registered: 03/25/01
Posts: 93
Loc: 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

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#17129 - 11/21/02 06:50 AM Re: WIRE AMPACITY
Matt M Offline
Member

Registered: 03/25/01
Posts: 93
Loc: 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).]

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#17130 - 11/21/02 08:26 AM Re: WIRE AMPACITY
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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."

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#17131 - 11/21/02 06:08 PM Re: WIRE AMPACITY
George Offline
Member

Registered: 02/23/02
Posts: 380
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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#17132 - 11/23/02 06:40 PM Re: WIRE AMPACITY
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Must say I agree Paul,
its a very "round" sounding word.
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