Mark Ross wrote:
>
> My question(s) is this.  Are there guidelines for burying high voltage
> traces on inner layers to meet spacing requirements or are there none.
> Lets say that I put one side of the 220V line on the Top side of the 4
> layer board, and the other side of the 220V line on layer 3, are there
> still spacing requirements I have to meet?

        Apply the spacing listed for internal conductors to all
        three axes to be safe.  However, I have not had much luck
        getting more than hearsay on spacings for UL acceptance.

        Anyone out there with the internal/external spacing values
        for say, UL, CSA or VDE at 48vdc/110vac/220vac?

        Regards,
--

      Jeff Seeger                             Applied CAD Knowledge Inc
      Chief Technical Officer                      Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                    978 649 9800

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