11 ELECTRIC LIGHT AND ELECTRIC LIGHTING FIXTURES AND PARTS THEREOF; TRUNKING, PIPES, CONDUITS, CHANNELLING AND DUCTING, COVERS, CLIPS, CAPS, BLANKING PLATES SOLD AS A UNIT THEREFOR AND CONNECTORS, ALL FOR WATER OR GAS PIPES AND BEING PARTS OF DOMESTIC OR INDUSTRIAL HEATING, COOKING OR WATER SUPPLY INSTALLATIONS