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Electrical Inspection & Testing Forum
RCD and Minimum Insulation Readings
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<blockquote data-quote="chris_k" data-source="post: 72084" data-attributes="member: 1679"><p>....how low can an insulation reading be before an rcd will trip?</p><p></p><p>Well here goes.</p><p></p><p>I had a job sprung on me last minute, bungalow conversion to dormer. Involving widening and raising the roof. On my initial inspection all was ok ish. TNCS , Other services next to cu, gonna need new board for rcd protection,</p><p></p><p>Plan</p><p></p><p>2 extra circuits to add to board for upstairs, Change a few jbs for non maintenance ones. easy job.</p><p></p><p>Well when builder starts job i get a call "..can you just come and have a look?"</p><p></p><p>I arrived to find all insulation removed and a mass of wires. Like a spiders web. Wires going everywhere. Counted 24 JBs, Rubber cable, old colours, new colours, Steel wire, JB`s with no covers, Choc blocs everywhere untaped. Decide to crack open cu. MY GOD. Rats nest of above wires. Best was 2.5mm into incoming side of main switch to feed a COOKER because not enough mcb`s.</p><p></p><p>Turns out the homeowner used to be an electrician down the pit. :_| </p><p></p><p>Cant have builders working around live stuff so crack on with making safe. found ringmains in multiple loops all interconnected, same with lighting circuits. Ended up removing 50% of the wiring, Connected up all dropped earths.....Tell builder and householder will have to test the lot and see what happens.</p><p></p><p>Testing arrives. Faults were everywhere. One lighting circuit had a direct connection between live</p></blockquote><p></p>
[QUOTE="chris_k, post: 72084, member: 1679"] ....how low can an insulation reading be before an rcd will trip? Well here goes. I had a job sprung on me last minute, bungalow conversion to dormer. Involving widening and raising the roof. On my initial inspection all was ok ish. TNCS , Other services next to cu, gonna need new board for rcd protection, Plan 2 extra circuits to add to board for upstairs, Change a few jbs for non maintenance ones. easy job. Well when builder starts job i get a call "..can you just come and have a look?" I arrived to find all insulation removed and a mass of wires. Like a spiders web. Wires going everywhere. Counted 24 JBs, Rubber cable, old colours, new colours, Steel wire, JB`s with no covers, Choc blocs everywhere untaped. Decide to crack open cu. MY GOD. Rats nest of above wires. Best was 2.5mm into incoming side of main switch to feed a COOKER because not enough mcb`s. Turns out the homeowner used to be an electrician down the pit. :_| Cant have builders working around live stuff so crack on with making safe. found ringmains in multiple loops all interconnected, same with lighting circuits. Ended up removing 50% of the wiring, Connected up all dropped earths.....Tell builder and householder will have to test the lot and see what happens. Testing arrives. Faults were everywhere. One lighting circuit had a direct connection between live [/QUOTE]
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