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Current ratings of bars


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#1 marke

marke

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Posted 04 March 2003 - 09:56 AM

QUOTE


I was looking for a program to calculate the current rating
of various bus bars combination and sizes.  I have dowloaded  
your program busbar32.exe and examined the tab Busbar-Rating.  
Your program seems ok for single bars but to be usefull it  
should state the underlying assumptions such as frequency and  
maximum temperature  
rise.
 
I noticed that if you set the ambiant to 90deg C, you get a
rating of 0 for aluminum and a rating for copper. This seems  
to be wrong since aluminum rating would be approximately 62%  
(depending on conductivity) of the copper rating.


The reason you get the 0 rating for aluminium at 90 degrees and 0 for copper at 105 degrees is that the standards call for a maximum operating temperature for Aluminium of 90 degrees C and for copper of 105 degrees C. If the ambient temperature is equal to the maximum operating temperature, then the current must be zero. Any current would result in a temperature rise above the set limit.
Best regards

#2 williamjlobo1950

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Posted 16 February 2012 - 08:04 AM

http://www.easypower.com/

You may use this site for downloading the software free of cost for 6 months.




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