Doug Brooks published the results of a study on the subject at: http://ultracad.com/articles/via.pdf On Fri, 19 Jan 2018 19:00:08 +0000, Nutting, Phil <[log in to unmask]> wrote: >Many of our designs use 1, 2 or 4 ounce copper for our heavy current applications. Vias and plated holes might have � or 1 ounce of copper plated in. So, is there a design guide for the number and size of holes to effectively transfer the current from one side of the board to the other side of the board? > >Phil Nutting | HVP Senior Development Engineer | Excelitas Technologies Corp