I have an application with a TG150 rated PCB board
We are running mains voltage of 480Vac on two adjecent layers on the PCB with 1mm distance between the layers
However, I would like to know what the minimum distance which would be accepted without long term problems (this is from mains phase to phase, so not safety related, which would normally be 1mm solid)
I found this link, which has good info:
On page 16 it details 150V/mil (6000V/mm)
So are we in the clear using 480Vac with say 0.3mm distance?