Oh, boy does this topic bring up memories. We had a customer that had one salesman who continuously had fried phones and computer keyboards at an upscale office furniture company. See, he wore expensive leather-soled Italian shoes and tended to "kick" himself around in his office chair while he spoke on the phone. With the phone handset that had some eventual reference to ground, along with the computer keyboard, this was an ongoing problem. Something was broken every week with no explaination.
It turned out that the static that he managed to build up "skooting" back and forth on the swivel chair from the carpet, all that it took was for him to touch the keyboard or phone and create yet another $500.00 repair job.
Fabric softener and water (about a 50/50 mix) in a spray bottle applied to the carpet around his office area was all that it took to solve his expensive Italian leather shoe problem.
As for racks, we always bond them with #6 copper; just a simple Ilsco lug connected to a rack screw space near the bottom (or top) and a few inches of copper between them. We tie them back to the nearest grounding facility to make it look good, but in reality, like Reno said, it's the equipment's grounding conductor that is all that is needed.
Architects mandate ridiculous bond bar setups in closets, some connected by silly 2/0 copper connections to the GEC, but in reality, they are serious overkill. Why is it that 3-prong receptacles provide suitable ground connections for the equipment connected through them, yet a 2/0 is required to protect equipment connected through the very same means?
You can't keep people from causing problems. You just have to take steps to minimize the impact of the problems that they cause.
