Grounding bushings connect a wire to the pipe. By connecting two grounding bushings on opposite ends of a nipple together, they were merely bonding one end of the metal nipple to the other end. Maybe they thought this was required because of the requirement for redundant grounding (bonding) in health care facilities. In any event what they did was useless. A green wire from one panel's ground bus to the next panel's ground bus would be redundant grounding (bonding) with the locknuts and metal nipple the other bond. What was done falls a little short.
