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Lighting question

Former Community Member
Former Community Member
So today I wanted to add another switch in a house.


The extra switch would need to now include an intermediate due to it being already 2wY.


now when I took the switches off, one switch the common has just a single sheath core, the L1 and L2 are a 2 core cable L1 being Red and L2 being black.

This is exactly the same in the other switch.


I thought this must mean there is a JB somewhere ? In the light fitting there is 3 T&E, and 1 single cable which goes into the lamp live! 


I just can’t understand how this could be wired? 


Any ideas?
Parents
  • 0
    I would also check around at other nearby ceiling roses ... it's possible they've nicked the permanent live from another rose that was physically closer, or easier to get to.   The idea of a cable tracker is good. They needn't be expensive. I use one from amazon that's really designed for datacomms work, but on a DEAD mains installation it works fine. And it's cheap enough that if (when) i accidentally connect the tx to something live, it will be cheap enough to replace.


    The only caution is that, as per the covering my posterior side, it MUST be assured the cable is completely dead, as of course being designed for datacomms only it has NO category rating and its behaviour when connected to 230v would be ... undefined but probably messy.


    The same device includes a basic continuity tester which can be handy for when you think you've found the cable you want. Simply flip the switch and short the cable to earth or whatever other wire you were using for the circuit.
Reply
  • 0
    I would also check around at other nearby ceiling roses ... it's possible they've nicked the permanent live from another rose that was physically closer, or easier to get to.   The idea of a cable tracker is good. They needn't be expensive. I use one from amazon that's really designed for datacomms work, but on a DEAD mains installation it works fine. And it's cheap enough that if (when) i accidentally connect the tx to something live, it will be cheap enough to replace.


    The only caution is that, as per the covering my posterior side, it MUST be assured the cable is completely dead, as of course being designed for datacomms only it has NO category rating and its behaviour when connected to 230v would be ... undefined but probably messy.


    The same device includes a basic continuity tester which can be handy for when you think you've found the cable you want. Simply flip the switch and short the cable to earth or whatever other wire you were using for the circuit.
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