where do these 3 sets of wires lead? can you get above? they all come through the same hole?
"3 sets of 3 core wires" = 3 no. Twin and Earth cables?
do any of the black cores have a red tape or marker on them?
"3 sets of 3 core wires" = 3 no. Twin and Earth cables?
do any of the black cores have a red tape or marker on them?