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What is the purpose of removing the bonding in the sub, but not in the main panel?
Visuals probably helps explain these questions.
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I interpreted that as for test purposes to identify the two lines.
2x on circuit diagrams help. Earth is ground but there are telluric currents flowing there. I don't know the scale but dirt is probably an insulator. Massive grounds to bedrock let you do some weird stuff. Like Tesla's Wydencliffe tower.
In the video those plasma jets are making a hissing sound.