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You can select the wire size (from Maximum amps for chassis wiring) then calculate the cross section area and devided by the copper thickness of the board. you will get the trace width.
Don't forget to add 25% for the current capacity (safety factor) before selecting the wie size.
You need to do lot of paper work before layouting the board,because it reuires lots of iteration to optimize.
can i know for what application is the board is used for?
Busbars are the best for this kinda application,also make the trace wide as much as possible,go through the pdf and link for the thicknessof the trace.
Later open the mask for the entire length,for which there is 50 amps current flowing,now take some strands of wire embedd it on the entire length by pouring lead over them,by this u can increase the resistance. http://www.geocities.com/suppanz/TraceWidth.htm
Havi, I suggest you should un-mask the normal track area say 1cm width and place (solder) a wire strip (copper) on it. In this way your track width will be in limits as well as you are save money of dipositing copper etc.
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