I am doing 100..150Amax, smps current pulses on heavily tinned double sided
parallelled PCB copper planes of 2.5x2.5". To connect the 25 sqrmm supply
cables to the PCB, I use soldered M5 brass spacers.

Daniel...

> On Sat, 11 May 2002, Olin Lathrop wrote:
>
> >> The new question then is how to figure out the resistance
> >> of a PCB trace.  From AWG/resistance tables for copper wire,
> >> I can calculate the resistance of the copper layer with the
> >> known thickness/width, but the solder coating adds an unknown
> >> factor, as I haven't seen any PCB house specs on that.
> >
> >The board house should be able to spec the copper thickness, usually in
> >"ounces", which can be translated to ohm/square after some figuring.
> >However, they will usually spec only the minimum thickness, and I would
> >worry about differences between boards and production batches.  This
could
> >be overcome by doing calibration at production time and storing values in
> >EEPROM or whatever.  It's going to be tough to get a PCB trace to handle
> >100A though.  I still think that measuring the drop accross the existing
> >wire or inserting a calibrated wire is a better solution.

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