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Equipment grounding conductors turning black

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    #16
    Originally posted by zbang View Post
    Sulfur in the air will blacken copper, and one way to get it is bad sewer vents.
    Yeah, but you are going to smell that.

    -Hal

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      #17
      Originally posted by hbiss View Post

      Yeah, but you are going to smell that.

      -Hal
      Is this a farming community? I have seen that happen after lime sulfur sprays were mixed & stored near a panel in a barn.
      Comments based on 2017 NEC unless otherwise noted.

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