I'm planning to convert an ATX power supply to a bench powersupply. It came to my knowledge that the DC ground is actually connected to earth. As I understand, this might become a major issue if I were to connect an oscilloscope to a device with a earth ground.
So I opened the case of my power supply and I see that the ground is directly connected to the case. It seems the board has the DC ground connected through the screws to the case then from the case to earth.
Is there a particular reason why I should not isolate the DC ground from earth?
Some solution would be to use non conductive screws. Use a file to remove conductive material around the holes and use some non conductive washer to add some space between the board and the case.