You state..."I thought the latest thinking/code was to not have an earth ground on the sub pannel" BUTTTTTTTTT each structure served by an electrical service still requires grounding so Id still establish a grounding electrode system at the shop be it "made" like driving rod or rods into the earth or approved metallic piping or foundation steel etc etc.
You state..."All sub pannels have to have a seperate ground that runs back to the main pannel and its earth ground. This keeps everything on the same ground plane so you don't get a shock"
THATS RIGHT a sub panel has a seperate and isolated (from Neutral) equipment ground buss and its wired back to the equipment ground buss back at the main panel. It just so happens that at the main service entrance (there and not at subs downstream) the Neutral buss is bonded to the equipment ground buss and the Neutral is also bonded to a grounding electrode (driven rod or rods etc)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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