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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?
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    Sounds like a bog standard Loop in at ceiling rose jobby. The singles (or single and earth?) to C might be from a JB somewhere converting T & E to Singles or, as said, might be pinched of other switches. So the 3 x T & E might be loop in, loop out and switch or it might be loop in and two loops out i.e. a "tree circuit". You could take strappers from existing switch or a JB and, if 1 gang switches existing, you might swap one for an intermediate.Two lighting MCBs  on one RCD does point to possible "borrowed N" it was quite common in the day (I never liked it meeself).
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  • 0
    Sounds like a bog standard Loop in at ceiling rose jobby. The singles (or single and earth?) to C might be from a JB somewhere converting T & E to Singles or, as said, might be pinched of other switches. So the 3 x T & E might be loop in, loop out and switch or it might be loop in and two loops out i.e. a "tree circuit". You could take strappers from existing switch or a JB and, if 1 gang switches existing, you might swap one for an intermediate.Two lighting MCBs  on one RCD does point to possible "borrowed N" it was quite common in the day (I never liked it meeself).
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