2733 Manufacture of wiring devices

27.33.1 Wiring devices
27.33.11 Switches, for a voltage <= 1 000 V
27.33.12 Lamp-holders, for a voltage <= 1 000 V
27.33.13 Other plugs, sockets and other apparatus for switching or protecting electrical circuits
27.33.14 Electrical insulating fittings of plastics
27.33.9 Sub-contracted operations as part of manufacturing of wiring devices
27.33.99 Sub-contracted operations as part of manufacturing of wiring devices