I am designing a high voltage PCB so I have created clearance rules between nets equal to the pad spacing on the high voltage capacitors (4.5 mm). When I pour polygons, Altium appears to produce rectangular clearances around the pads for the capacitors. This probably does not matter with small clearances but with larger clearances I get large notches in polygons. Is there a way round this? screenshot

  • \$\begingroup\$ So you have a clearance rule, and you want to be able to ignore that clearance rule? I would just move the offending parts, so you can maintain your desired clearances. \$\endgroup\$
    – Hearth
    May 14, 2019 at 0:53
  • \$\begingroup\$ No, that's not what I want to do. I want to obtain the minimum clearance around a rectangular pad, no more, no less. That is not a rectangular area. \$\endgroup\$ May 14, 2019 at 1:33
  • \$\begingroup\$ milled air gap for creepage is best \$\endgroup\$ May 14, 2019 at 1:36
  • \$\begingroup\$ Please highlight the notches in your layout that are bothering you. \$\endgroup\$ May 14, 2019 at 16:58

1 Answer 1



  • klick on problematic pad,
  • in properties, change pad shape from "rectangular" to "rounded rectangle" and set corner radius to 1%
  • repour polygon

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