I want to add a second hall light, close to the second 2 way switch which is fed by a four core cable. Connected to the live and neutral of this cable the lamp goes off and on out of sync with the first light. Any solutions?
There is probably no neutral in that 4-core cable (I'm guessing it is 3-core and earth?).
The way to do it is to wire the second lamp from the existing one.
See the WIKI to learn how lighting circuit switching works
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