Does screen printing affect the insulation of the PCB between pins or pads?

[Etna.]

Hi!

I am new here and hopefully you can help me out with this one. I have noticed, that a few power supplies have additional screen printing on the pcb between pins/pads that carry higher voltages. So I was wondering: How would that affect the insulation? I am asking this, because I can't think of another reason why you print additional lines betweens those pins/pads or circles around pins and let the lower voltages be.

Regards,
Etna.

[Doctorandus_P]

sometimes there are marks every 5 or 10 pads to for easier counting during testsing, sometimes higher voltage tracks are marked to indicate the high voltage and lower the chance for accidental / casual measurements.

In general silkscreen is not used for voltage isolation. It's likely to improve isolation (a bit), but it can not be guaranteed or relied upon. But there are also other options such as conformal coatings that are especially designed to improve insulation, moisture and dirt resistance, etc.