papa smurf
Member
I've inspected a 3 phase 430 volt sec. pad mount transformer thats feeding 5 building and the sec. side of the transformers neutral is not grounded to the frame of the transformer. The neutral goes to the MDP neutral bar but is not bonded to the ground bar. The frame of the transformer has a ground going to the ground bar in the MDP. The ground bar is grounded at a grounded electrode. The MDP has a main that feeds five breakers in it which feeds 5 sub-panels at each bldgs. they only ran 3 hots and a neutral to each sub-panel located 500 ft. away. The sub-panel at the panel has a green ground going to a ground rod, but the neutral and ground are not bonded there either. I believe that this is a floating neutral. What should be done in this situation if they cant run an additional ground from the MDP to the sub-panel. Would it be safe to say that they can bond the neutral and ground at each point meaning the sub-panel, MDP and the transformer. Oh, these are also new bldgs.