I have an existing condition where I have a 480 volt feed from the service switchboard to a transformer. From the transformer the wiring goes into a wire way where it is tapped off to 3 disconnect switches and a panelboard. The disconnect switches then feed other panelboards through out the building.
The issue:
The disconnect switches and panelboard have the neutral and ground bonded and, the transformer also has the neutral and ground bonded. There is a ground from the transformer to building steel as well.
I understand that the neutral/ground bond should not be in both places.
Where should the correction be made. Should the neutral/ground bond be separated at the transformer or at the disconnect switches and panelboard? And why?
The issue:
The disconnect switches and panelboard have the neutral and ground bonded and, the transformer also has the neutral and ground bonded. There is a ground from the transformer to building steel as well.
I understand that the neutral/ground bond should not be in both places.
Where should the correction be made. Should the neutral/ground bond be separated at the transformer or at the disconnect switches and panelboard? And why?