The "single ground point" is some sort of weird misconception of how ground systems work that became an urban legend. I think it comes from the fact subpanels u

The "single ground point" is some sort of weird misconception of how ground systems work that became an urban legend. I think it comes from the fact subpanels used to be allowed to bound the neutral and ground and that putting a ground rod there created another return path for current from the neutral.