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Thanks, this PCB sits in an earthed metal enclosure, which is not accessible to human hands..because its inside another metal full enclosure.

As such, since the boards still work following this flashover, i presume that we are ok to pass this off?

The customer says for the application that the 4.5mm was fine.

Nobody could possible touch it.

[automerge]1723184643[/automerge]

Also, primary has a plastic TO220 FET screwed to the heatsink, and secondary has a TO220 plastic diode screwed to the same heatsink....so the distance between the conductors in those TO220's is probably only effectively some 3mm....would you say this is a concern? (because during the 4kv pri-sec test, the earthed metal enclosure is totally floating.