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Z-Axis voltage spacing

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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


Originally posted in cdnusers.org by msalberg

  • Your best bet is to get a Regulatory Consultant right now before your design goes much farther. They are worth the money in that you can design to meet the standards such that your product passes regulatory testing on the first version. You can also order the UL standards from UL.


    Originally posted in cdnusers.org by Kalevi2
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