I am laying out an isolated power supply PCB. I would like to keep 3 high voltage nets on the input side of DC/DC converters spaced appropriately from the output side of the converters to prevent flashover. In the constraints manager, I can set a spacing constraint for a particular net, but it creates that spacing and automatically modifies shapes associated with all of the other nets. I would only like the tool to change shapes and give me DRC errors for a subset of the other nets. It looks like I need to create a spacing CSET and then set the constraint for the 3 high voltage nets. Has anyone done this? Is this the way to do it.
Basically I want to keep nets x,y, and z 150 mils away from nets p, d, q, r, s, and t and not apply that constraint to any other nets.
Any help would be appreciated.
Thanks.
Shaune