how do I wire a new light fitting?

oh so you dont know which one that is?
do none of the black cables have any red sleeving/tape on them?
that would be the switch wire.
do you have a continuity meter?

chris gray
February 2010

first things first.
if there are 4 red conductors, 4 black conductors, there must also be 4 green/yellow conductors (earth).
1st isolate and make safe the circuit you want to work on, and test that it is dead. (turn off the mcb/rcd/rcbo at your consumer unit)
the 4 red cables that were in a connector block by themselves need to stay in that connector block, otherwise you are going to have issues with your full curcuit.
put the 3 black cables with the 3 blue cables in a connector block.
put the remaining black cable (should have red indicator on it) into a connector block with the 3 brown cables.
if you new light is a class2 fitting it may not require an earth. the green and yellow cables need to be put into a connector block of their own as well.

chris gray
February 2010

i belive that one set of the wires is from the light switch

dave
February 2010