Hi,
I am working on an ethanol plant and the ground grid is 4/0. From the ground grid to building steel and large stainless steel tanks they are using #2 XHHW for bonding..This is the GEC correct? They have also used this #2 from the grid to bond the case of some very large 4160V Motors..Should this not be sized by the largest OCPD?

Thanks
Greg

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