I know hte NEC calls for 8' of ground rod for house wiring.
This is a different application where I want to ground a piece of machinery for static discharge. It is not possible to get the rod into the ground more than 2 to three feet because it is on ledge. Aside from boring through solid rock for the extra five feet it would still probably not be the best contact. How effective is a shorter rod for static discharge? Is three feet better than nothing or not worth the bother?
No codes are involved, just trying to isolate electronics from static charges.