[PCB_FORUM] Z-axis voltage spacing

  • From: Mark Salberg <msalberg@xxxxxxxxxxxx>
  • To: Cadence User Group <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Tue, 19 Sep 2006 10:26:48 -0400

Hello group,
Can anybody steer me to an IPC and/or UL spec that references a Z-AXIS "volts per mil" distance through FR4 dielectric.
We have a 1200 V board and am "hearing" very different numbers.
50v / mil, 100v / mil and 750v / mil.


Also, is the IPC Voltage spacing table for internal conductors the save a Z-axis?

50v per mil thru an IPC "technet" as a "rule of thumb.
100v / mil from E.E's and other designers.
750v / mil from our UL safety guy. This was for a 1200V Cat II which has 6000v trannsients. Calculating to 750v / mil INCLUDING transients...6000V divided by 750 = 8 mil.


Who is right?
Where can I reference or verify this?

Thank you in advance,
Mark


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