Greenville County, New Home Electrical Grounding Requirements
If you have more than a single panel, such as a 400A (class 320) meter that feeds two adjacent 200A panels, a single grounding electrode conductor needs to connect the two panels to the grounding electrode. Other supplemental electrodes such as an additional ground rod, concrete encased rebar, building steel, water piping, are not required to be connected all to that single conductor that goes to the primary grounding electrode. Supplemental electrodes can be connected by a continuous conductor or irreversible tap connection to the primary grounding electrode conductor, but it is not required to be connected that way.