In my last shop, I did not ground. Of course I was only in there a 8-12 hrs a week. Now retired and hope to use more in a new shop. I have a ClearVue DC, and 6" PVC SW PVC piping. I have some metal gates and some clear plastic gates. Any drops to 4" go to Rocklers expanding DC coil. In my last shop, the only time I got shocked was my DW 12" planer. I never disconnected it to see if there a short coming from the machine but I suspect there may have been. So do I really need to ground and what is the best way to ground it, externally or internally (internal would create some drag due to friction but in 6" pipe it should be minimal? I also assume it should be connected and grounded back to my 220V DC. Does it need to be connected to anything on the opposite end? Thanks in advance y'all