Recently a home inspector noted the exposed copper grounds and the stripped ends on copper conductors were black or tarnished inside the panel ? First thought I had was chinese drywall issue but no other issues in the home . I we looked deeper the home is about 10-12 y.old and the only thing that was strange was if the soil outside may be leaching some sort of corrosive gas thru the underground feeder power riser to the meterbase ? The panel is back to back with it and the ground wire to the grounding rod was clean as it entered the bay below the meterbase but blackened once it was in the panel ? Has anyone ever experienced anything like this ? Thank you in advance for responses.
