Sorry, I cant answer that, its a question for your local utility and if any governing body then must inspect and approve the installation???
3 wire isnt really so bad, it was used for yearssssssssss and whats there may well be grandathered in,,,,,The new NEC (4 wires to outbuildings) is partly concerned with you may have communication lines like phone or internet cables etc etc and depending on if they were grounded properly.
If theres already 3 three wire feeds out of one location I dont see problems with one more but again I CANT ANSWER THAT. Its more important when a main panel feeds sub panels in SAME building that you do NOT re bond Neutral and Equipment Ground but they cut you more slack when its a seperate outbuilding........
If Neutrals get in paralell with Grounds and get rebonded downstream and if the exact WRONG SET OF ERRORS HAPPEN you may be either energizing the Equipment ground (and it ties to your toaster or metal saw or drillcase, I dont like the sound of that, a hot case) and/or using the ground as normal current return although its supposed to be a dedicated path for fault current ONLY.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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