This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Strange C.P.C. attack and size reduction.

Evenin' all,

                         today I attended a shop store at a beach location. The store is on the prom just above high water level.


I decided to replace a double socket with rusty screws that the owner has suspicions about. The socket is wired in old 2.5/1.0mm2 T&E copper cable. There were three 2.5s connected at the socket, a ring pair and a spur. The live of the spur cable was blackened at the point where the sheath had been removed. The copper C.P.C. of the spur cable immediately snapped off when I moved it. It was discoloured and pitted along its length, but the weird thing is that its diameter reduced, pretty much consistently, the closer the C.P.C. was to the remaining sheath. When removed, the copper C.P.C. resembled a needle, tapering down in diameter towards the place where it broke off at the point of sheath removal. Was this due to historical tracking between live and C.P.C? Or was it electrochemical corrosion and weird physics? The damaged length was about 50mm long,


Z.


Parents

  • Sparkingchip:

    Poor cable insulation stripping resulting in the copper conductor being stretched?


    Andy B.




    Quite possible, as the cable was only just long enough to terminate. It might have been puled very vigorously, but some considerable strength would be need I reckon to reduce 1.0mm2 copper wire. Or, possibly faulty cable from new with an overstretched earth wire?


    Z.

Reply

  • Sparkingchip:

    Poor cable insulation stripping resulting in the copper conductor being stretched?


    Andy B.




    Quite possible, as the cable was only just long enough to terminate. It might have been puled very vigorously, but some considerable strength would be need I reckon to reduce 1.0mm2 copper wire. Or, possibly faulty cable from new with an overstretched earth wire?


    Z.

Children
No Data