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Originally Posted by Shaun 84 Targa
wouldn't the black soot feathering out mean sparking? When I think of signs of heat, I see a weld pattern as evidence. this looks different. I can take more pics if anyone wants.
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Yep. Could be corrosion between the plates has created high resistance causing the potential to arc across the lower resistance conductor to the plate which is through the screw.
Shaun, is this box only acting as your main disconnect which then routes three phase to another panel???? If so, does your other panel have another three phase main breaker??
If this is your set up I'd think about having that box fully replaced with a switch blade disconnect with in line phase fuses instead of just replacing that breaker.
There is more corrosion in there than should be...