Steve I will say I don't see any difference between AC, FMC or LFMC in this regard. If it is not installed to 300.11 standards (secured next to the box) it should have a ground wire. Whenever you have a whip to something that can move around or where the whip can be moved around you are going to loosen a certain percentage of the connectors. At least one of the pictures I sent into IAEI shows a separated FMC connector under a computer room floor with about 4" of conductor exposed. Without a green wire ground that equipment was floating. The same can happen to T bar lights, pump motors, wall ovens or whatever you hang out on a whip. Fortunately I never had the fight when I was an inspector. Insulated EGCs were required in all state contracts, even in EMT, IMC or RMC.
