It appears that all switchboards and panelboards have neutral and ground bars that are all isolated from their respective enclosures. If a phase to enclosure fault were to occur what is the "effective ground-fault current path" [250.4(A)(5)]? Should not the neutral bus in each main switchboard be bonded to its enclosure, and an EGC be installed betweeen the transforme frames and the switchboard enclosures, and individual (non-isolated)EGC's be run to each panelboard and bonded there to the enclosure? JKV
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