A little input please. I have a existing metal prefab building with 6 interior panels mechanically attached to the metal of the building, all of the panels DO NOT have a EGC installed with the feeder and fed from the same source. All of the EGC's of the branch circuits are connected to a bar in each panel which is connected to a electrode only. So with the install as it is there is not a effective ground fault current path back to the MDP that is located outside. I believe that if the neutrals in the six panels are bonded in each of these panels it poses a risk of neutral currents flowing across and between the metal parts of the building.