Hi,

according to IPC4101 the specified breakdown voltage of FR4 is 40kV/mm
for laminates thicker than 0.5mm, according to IPC2221 the internal
conductor distance for 500V DC is 0.25mm. Is there any specification
which says high and low voltage traces are not allowed to cross between
internal layers of an pcb? Or is it fine to use the FR4 as an isolation
between areas where basic isolation is recommended?

Thanks,
Torsten



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