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Do-It-Yourself (DIY) Question & Answer Forum
Rogue RCBO?
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<blockquote data-quote="UNG" data-source="post: 543156" data-attributes="member: 8931"><p>During an EICR recently I found no continuity on the downstairs ring, eventually tracked the fault to a cable that had been spiked by a picture hook pin which must have happened many years ago as the plaster didn't have a pinhole in it but the conduit below the surface clearly did. After removing the damaged cable it was clear that the insulation on the live conductor had been pierced by the pin and had also been in contact with the earth as internally the cable was showing signs of the start of a fire with the blackened live and earth, though the IR tests didn't give any readings low enough to cause concern</p><p>The installation was a 3036 Wylex with and upfront RCD and I suspect that the RCD may have operated and been reset a few times until such time as the fault blew clear and normalish operation resumed in blissful ignorance of the problem below the surface for possibly around 10 years</p><p>Installation now has a new 10 way RCBO fusebox consumer unit and a repaired ring circuit</p></blockquote><p></p>
[QUOTE="UNG, post: 543156, member: 8931"] During an EICR recently I found no continuity on the downstairs ring, eventually tracked the fault to a cable that had been spiked by a picture hook pin which must have happened many years ago as the plaster didn't have a pinhole in it but the conduit below the surface clearly did. After removing the damaged cable it was clear that the insulation on the live conductor had been pierced by the pin and had also been in contact with the earth as internally the cable was showing signs of the start of a fire with the blackened live and earth, though the IR tests didn't give any readings low enough to cause concern The installation was a 3036 Wylex with and upfront RCD and I suspect that the RCD may have operated and been reset a few times until such time as the fault blew clear and normalish operation resumed in blissful ignorance of the problem below the surface for possibly around 10 years Installation now has a new 10 way RCBO fusebox consumer unit and a repaired ring circuit [/QUOTE]
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Rogue RCBO?
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