Comment 2 for bug 1843834

I can confirm. The DRC of pcb 4.2.0 treats zero clearance of pads as a design rule violation.

Zero clearance can be intentional to make the pad connect with the polygon. If zero clearance was set by accident, the resulting shorts get caught by the connection check. I agree with Joseph that DRC should not complain about zero clearance.

Zero clearance is a bit of a dirty hack though. It totally dissolves the pad in the polygon. Depending on the soldering technique this might not be desirable because the polygon may dissipate heat faster than the solder tip can deliver. For thru hole pins the thermal tool can be used to make the proper amount of connection. I would be nice if the thermal tool would work on pads, too.

---<)kaimartin(>---