This is a new house.Service panel is fed from a meter bank with 4 conductors.
Panel is grounded to a CEE. Neutral and bonds are separated in panel.
All circuits are 2 wire southwire NM.
Water is all plastic, even from the street.
Had panel cover off today and noticed the grounding conductors are turning black. What could cause this?
Panel is grounded to a CEE. Neutral and bonds are separated in panel.
All circuits are 2 wire southwire NM.
Water is all plastic, even from the street.
Had panel cover off today and noticed the grounding conductors are turning black. What could cause this?