Q: Not enough empty space for isolation gap, can a pcb cut works as substitute? I have a pcb that needs an isolation gap where no components, pads, taces, or copper must be placed. But due to board space limitation, a cetain area of the isolation gap must have pads in them. This would compromise the isolation.
To get back the isolation specification, I was thinking of placing a slit in that area as a substitute. Because i would assume that air has better insulation than the PCB FR4 material.
In the image below the hight of the gap is 10mm. So i am thinking of placing an air gap of aroun 1-2mm thickness and make sure that the shortest route between pad-pad around that slit is more than 10mm

Am i doing think correctly?
