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Engineering
Electrical Engineering
Insulated copper wire turned into gray powder
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[QUOTE="Majorana, post: 6229949, member: 583529"] Dear all, thank you so much for all your contributions. Going backwards: [USER=614295]@Klystron[/USER] the floor is not a raised floor with plenum, ducts etc. It's an ordinary, old concrete floor, with plastic tubing for electrical wires embedded in it. [USER=539397]@Guineafowl[/USER] I'm really unable to see your point in sticking with the aluminium idea, despite all the contrary evidence. Until now, I did not want to mention the fact that I am an experienced electronics designer, that I also designed electronics for military aircraft in service nowadays, and that I have handled, stripped and soldered electrical wires of any sort for almost 50 years now, but now I feel obliged. Any scientist knows that trying to shape evidences in order to match a theory leads to faulty results. I know very well that an aluminium wire would explain this phenomenon much easily than a copper wire, but unfortunately this is not the case. I might borrow a camera with macro lens just to post a picture of the cross-section of the copper strands, but I feel that this thing has gone too far. [USER=455902]@anorlunda[/USER] yes, it's perfectly possible, and in addition the colour of that powder was not perfectly homogeneous. The next step I wish to take would be to have that powder analyzed. It's not so easy to find a lab willing to do the job for a private citizen. In case I find one, I would certainly post the results here, be sure of that. [USER=23711]@Borek[/USER] as I mentioned a couple of times in my above posts, the two external sections of the cable that did not lie under the floor (they went vertically from the floor to a junction box on the wall on one side, and to the loudspeaker on the other side) are completely normal and unaffected, as well as a length of excess cable left over after installation and stored in a drawer in the same office. [/QUOTE]
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Insulated copper wire turned into gray powder
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