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syhaunguyen , 02-15-2016, 11:15 AM

Hi all,

I need create clearance design rule for checking in our pcb project.

I have two net class A and B
I want to set clearances for these net classes with anything not in the class is 120mil. please help me how to set this rule in Altium Designer.

Thanks all,

mairomaster , 02-15-2016, 03:13 PM

Hi syhaunguyen,

If I understood correctly, you want a minimum clearance of 120mil between objects in net class A and all other objects, and minimum clearance of 120mil between objects of net class B and all other objects.

If that is the case, here is how to set up such rule with custom queries:


I am using Altium Designer 16, it might look a bit different with older versions.

syhaunguyen , 02-15-2016, 06:07 PM

Good day to you @mairomaster it's OK now. Thanks you so much.

Once more Q, How to disable check on no-net pad? Picture attach.

mairomaster , 02-16-2016, 12:58 AM

The best practice in my opinion is to put a No-DRC directive to all unconnected pads in your schematics. That also ensures you will not randomly forget to connect a pin and prevents errors/warning during the schematic compilation as well. After placing the directives don't forget to re-compile the project and import the changes to the PCB.

Here is how to place the directives:

syhaunguyen , 02-16-2016, 01:00 AM

Thank @mairomaster great to know that.