Random question I thought someone might be able to answer! I want to replace a wall light, so bought a new one, it just has one brown and one blue wire, no earth. But I have removed the old one and for some reason it has two sets of wires? 2 blue, 2 brown, and 2 earth. What is the second set for? Can I just insulate the 'spare' set of wires and connect one set?