Ceiling rose wiring with two way switching (older cable colours)
Assuming your two way switch wiring uses the ‘old’ core cable colours i.e Red (live), Black (neutral) and Green/Yellow (earth) for cables A, B & C then Fig.1 shows the most common way your ceiling rose will be connected in a 2 way lighting circuit.
Click Here – If the cables A, B & C in your house have Brown (live), Blue (neutral) and Green/Yellow (earth) cores.
Cable A and Cable B are the live, neutral and earth loop to each of the lights in the circuit, (Cable A feeds in the live supply from the previous light in the circuit and cable B loops out to supply the next light in the circuit) these cables remain ‘live’ even if the light switch is off, this is why you should ALWAYS make sure the circuit is isolated before you start work.
Cable C is a twin Red and Earth which is connected to the first light-switch.
Cable D – Tree core and Earth connecting the two two way light switches.
1 and 8 – the live and neutral conductors that connect to the ceiling rose lamp holder.
2 – the return live (switch-wire) from the light-switch.
3 – the live feed to the light-switch.
4 and 5 – both permenantly live conductors.
6 and 7 – both neutral conductors.
9 – the common earth terminal where the Earth conductors from each cable are terminated, the Earth cables must be connected to the terminal (these Earth wires may be bare copper in which case you should sheath them with Green/Yellow sleeving). You should also make sure the earth at the light-switch end is connected to the Earth terminal of the metal back box and/or metal light-switch if used.