Re: [SI-LIST] : via current carrying capacity

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From: jrbarnes@lexmark.com
Date: Thu Feb 01 2001 - 13:07:04 PST


>John, are the equations swapped for the internal/external trace types? I would
have
>assumed the surface traces to be capable of carrying more current than the
buried
>traces or have I missed something?
>Regards,

Chris,
I had a typo in the comments in my spreadsheet, but the equations I used and the
calculated
ampacities were correct. The correct equations are:
> * For external traces I = 1500*thickness^0.72*width^0.75*deltaT^0.45,
> * For internal traces I = 750*thickness^0.72*width^0.75*deltaT^0.45,
                             ~~~
> where:
> * I is the permissible current in Amps.
> * thickness in inches.
> * width in inches.
> * deltaT is permissible temperature rise in degrees C

Thanks!
                                   John Barnes Advisory Engineer
                                   Lexmark International

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