Dielectric Strength must be considered for High Voltage Designs.
You may find dielectric strength specified in KV/Meters. However since PCBs are consider thinner than a meter we need to reduce the specification to mils (thousands of an inch) or Milli-meters (metric).
So:
A spec of 30KV/meter = 76V/mil for Dry Air.
Humidity must all so be considered, the dry air calculation should to be derated.
High-Voltage-PCDesign.pdf (application/pdf Object)
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