Setting different clearances for different Net Classes not working

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1

Hello,
[V9.0.3]
I used the Net Class section from the Board Setup menu to set different clearances for different net classes. For example, I want a particular clearance for USB and a different one for an antenna feed line. But this method doesn’t work. What am I doing wrong?

Also the differential pairs also don’t respect the width and spacing as specified in constraints but it needed to be set in the net class sub-menu and it worked.

2

Whenever you say that something is not working specify in what KiCad version it is not working as it can strongly depend on that number.

3

“Doesn’t work” is extremely ambiguous. I can’t know what it means unless you give more details. For example, screenshots from the netclass dialog which shows the relevant netclasses and nets. And a relevant view from the PCB.

4

Sorry, I tried both in 9.0.2 and 9.0.3. Also I do remember this problem from version 8 too. I think it’s just me doing it wrong

5

Well, what I meant is that just setting the differential pair width in the pred-defines sizes is not enough. I think what matters is setting the DP width and spacing for the Default class. If I only set the size in the pre defines sizes, the diff pairs width and spacing is some default value.
If this still doesn’t help, I may provide screenshots

6

Do you mean you have been talking about differential pairs and their spacings etc. all the time? That wasn’t clear in the topic subject or the first passage of your message.

7

I am using netclasses (I’m still in V8) only to set bigger clearance (0.4mm) for my High Voltage (24V) tracks compared to default tracks working at 3V3 max (0.2mm). I had never noticed any problem with it.

8

Well that too. But the first paragraph was about trace clearances. To give another example, I want HV* netclass to have 0.5mm space and antenna netclass to have 0.15mm. Even if I define both in the netclasses, the new clearnaces don’t get set by the ground pour. The ground pour only respects the zone properties.
Also the diff pairs issue is similar I guess. That’s why that was also included here