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September 2015

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Subject:
From:
Yuan-chia Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Yuan-chia Joyce Koo <[log in to unmask]>
Date:
Fri, 11 Sep 2015 20:16:16 -0400
Content-Type:
text/plain
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text/plain (68 lines)
this link might help... it all depends (look like more 10% if the  
margin calculation is done on the tight side - the design should call  
the shot - literary (:
http://ecmweb.com/content/sizing-continuously-loaded-conductors-made- 
simple
have a nice weekend.
             jk
On Sep 11, 2015, at 2:16 PM, Bob Wettermann wrote:

> Dear Technetters:
>
> Had the following question from a client today...
>
> *...... a question regarding damaged conductors  (nicks and scrapes  
> >10%). *
>
>
>
> *I have a 7 stranded wire that is cut and stripped by an outside  
> supplier
> that has multiple wires coming in either nicked or scraped >10%  
> resulting
> in a defect condition. My question is what is the reasoning or
> justification behind this accept/reject criteria?*
>
>
>
> * I can guess that it may have some limitations regarding current  
> carrying
> capabilities or are subject to latent defects ( severed )  
> conditions due to
> the end use environment/vibration, corrosive etc.. *
>
> *My answer has to do this is:*
> The ampacity for the  conductor is a function of the material  
> (copper or
> aluminum for example) and is based on its physical and electrical
> properties of the material. It is the current which can be carried  
> such
> that the material would not up and be destroyed. The absolute value  
> of this
> is a function of the amount of material (a nicked conductor would  
> have less
> ampacity) and the reasons that the maximum deterioration was chosen  
> to be
> 10% was <????>
>
> Maybe this iso ne of those times, just like you tell your children,  
> just
> because!
>
> Bob Wettermann
> BEST Inc
>
>
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