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A ground rod doesn't offer a complete ground per se. this is because of ground resistance. some soils may contribute greatly because of moisture and salts present, others may not like a sandy soil. the isolated neutral has to do with short circuit tripping. the aux ground has to do with fault current. even though the origin of the two cables is the same - your neutral in the main panelbox at its remote end it's isolated. I could never comprehend this myself - just go with the flow of what I'm told by inspectors.
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