Bry
December 14, 2020, 2:34pm
2
This was discussed following your inquiry in this other thread 5 days ago. You shouldn’t rely on the screw alone as it’s possible to center the screw in the hole and not have conductivity.
That coating is not conductive. So he is correct that the switch won’t self-ground. However, you can remove that coating with a dremel or other roto-tool. It will take about a minute.
Also, unless there is something weird in Canada, there shouldn’t be any reason you can’t physically ground the switch if you don’t want to grind the coating. The “never do it” is probably they usually don’t do it because the devices self-ground. At least in the US, we simply ground the switch with a pigtail.…
While the switch will ground on the screw, since the mounting hole is larger than the screw diameter, it is possible to mount the switch where you would not have contact between the screw and the conductive surface of the switch, hence no ground. So to insure a proper ground, scrape or grind off the coating or use a pigtail.