If you have a panel and have 8- 4" conduits all with 500 MCM, and want to run one wire thru all the grounding bushings and then continue to the grounding bar from the last grounding bushing, what ground size wire would be required. The breakers are 400, 600, and 1200 amps. List code sec please. Would table 250.122 still apply and use a 3/0 thru ALL the bushings?
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