Hello group,Originally posted in cdnusers.org by msalberg
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,