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<blockquote data-quote="apprentice87" data-source="post: 448299" data-attributes="member: 13534"><p>Hi Steps, yes that might well have been the case, but what i was getting at, is, the way i see it, in this gentlemans installation, there is absolutely nothing to be gained by the up front RCD. [and lots to be lost..]</p><p></p><p>True, as it protects the lights and only the lights, it will discriminate with the 30mA one so the lights stay on.. Now, i know that things do not have to comply with the latest version of the regs, but this setup would not be allowed now anyway, unless he wants to re-wire his lights in SWA that is..</p><p></p><p>Knowing that RCD's are about the most unreliable thing there is, i would think that there would be a lot to be gained, by simply swapping the 100mA TD one for a 30mA none time delay one. This will not only give protection to the wiring in the walls [not being in earthed conduit, 50mm blah blah] and, even better, would act as "redundant protection" too [being in series with the second one] and hence give much more reliable ADS for the sockets in the event of a fault..</p><p></p><p>That is the way i see it anyway...</p><p></p><p>john..</p><p></p><p></p><p></p><p></p><p>It might do, but what does it ALSO say about the wiring for the circuits protected by the 100mA TD...</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 448299, member: 13534"] Hi Steps, yes that might well have been the case, but what i was getting at, is, the way i see it, in this gentlemans installation, there is absolutely nothing to be gained by the up front RCD. [and lots to be lost..] True, as it protects the lights and only the lights, it will discriminate with the 30mA one so the lights stay on.. Now, i know that things do not have to comply with the latest version of the regs, but this setup would not be allowed now anyway, unless he wants to re-wire his lights in SWA that is.. Knowing that RCD's are about the most unreliable thing there is, i would think that there would be a lot to be gained, by simply swapping the 100mA TD one for a 30mA none time delay one. This will not only give protection to the wiring in the walls [not being in earthed conduit, 50mm blah blah] and, even better, would act as "redundant protection" too [being in series with the second one] and hence give much more reliable ADS for the sockets in the event of a fault.. That is the way i see it anyway... john.. It might do, but what does it ALSO say about the wiring for the circuits protected by the 100mA TD... john.. [/QUOTE]
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