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Do-It-Yourself (DIY) Question & Answer Forum
Replacing switch plates without a colour guide .
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<blockquote data-quote="Chewbacca" data-source="post: 546678" data-attributes="member: 22630"><p>anything sleeved brown is usally a 'line' or live in old terms. If you have only undone one screw terminal, logic says they all go back in that terminal, unless there was any unused. Have to say that would be rather unusual as it sounds like a modifed standard two way. I would have expected the 2 core cable connected to L1 and L2, and the 3 core, brown in common, blue and grey in L1 and L2 - doesn't usually matter which one. It's possible the terminal you havn't undone was actually loose and allowed the cables to just fall out. </p><p></p><p>as for test gear, it would be good if you are planning a career in electrics, to buy a set of Voltage probes, they are very useful for such problems. You should be looking for a live supply on the 2 core, which would be the switch line to the light, leccy in on one core, leccy out on the other. To test for that you will need to renergise the cct, so be careful. Whilst live, check the 3 core cable cores for anything live, they should be all dead. You can confirm that with the volt probes. If all dead, then these are two way switching cores, one common and 2 'strappers' as they are known. Turn leccy off again, twist together the 3 cores and check at the other light switch for continuity between the cores NB turn off upstairs and downstairs MCBs whilst doing that. This test will confirm the 3 core is being used for two way switching.</p></blockquote><p></p>
[QUOTE="Chewbacca, post: 546678, member: 22630"] anything sleeved brown is usally a 'line' or live in old terms. If you have only undone one screw terminal, logic says they all go back in that terminal, unless there was any unused. Have to say that would be rather unusual as it sounds like a modifed standard two way. I would have expected the 2 core cable connected to L1 and L2, and the 3 core, brown in common, blue and grey in L1 and L2 - doesn't usually matter which one. It's possible the terminal you havn't undone was actually loose and allowed the cables to just fall out. as for test gear, it would be good if you are planning a career in electrics, to buy a set of Voltage probes, they are very useful for such problems. You should be looking for a live supply on the 2 core, which would be the switch line to the light, leccy in on one core, leccy out on the other. To test for that you will need to renergise the cct, so be careful. Whilst live, check the 3 core cable cores for anything live, they should be all dead. You can confirm that with the volt probes. If all dead, then these are two way switching cores, one common and 2 'strappers' as they are known. Turn leccy off again, twist together the 3 cores and check at the other light switch for continuity between the cores NB turn off upstairs and downstairs MCBs whilst doing that. This test will confirm the 3 core is being used for two way switching. [/QUOTE]
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Replacing switch plates without a colour guide .
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