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loop3
Just read the first couple of post and didn't bother with the rest, no offence lads. I would inspect the lot! As mentioned , alterations and additions. Go all the way back to Ib In rating factors, grouping ambient,.... Volt drop, max llength, etc, thermal constraints, pssc compliance. In the long run it'll save you time. And your reputation. If your fix doesnt work from guessing, you will lose out financially.
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Darkwood
Loop3 .... already given likely causes further on, either loose main or sub neutral where existing loads have utilised a E/N fault as a return path or high current damage from welder secondary side, the OP's discription shows that issues with overheating lines hasn't occured but has been overheating on the earth alone, a full inspection will thus be recommended to ensure the integrity of all circuits hasn't been compromised which will cover all your points mentioned and further investigation with our suggestions in mind as to why the earth overheated on its own without tripping the circuit or showing heat damage to line conductors.
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Knobhead
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electric will
Welder could be using the piller drill cpc as a earth return, I'm guessing they do some welding in a vise bolted to a steel bench which the drill is stood on?
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