Jim Katen Posted September 10, 2020 Report Share Posted September 10, 2020 I've never seen this before. The MC cable was secured to a basement wall with some very attractive metallic & velvet wallpaper sandwiched between the two. The cable sheath just dissolved into a white crust. My best guess is that this is the result of galvanic corrosion, where the metal in the wallpaper acted as a cathode to the cable sheath, which acted as an anode. Any other ideas? Quote Link to comment Share on other sites More sharing options...
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