The earth wires are actually omitted for clarity and would want to get related whatsoever switches and ceiling roses. The wires would also be covered through the protecting outer sheath (cable). In case you have Philips Hue bulbs, the Philips Hue dimmer can be used for a wireless remote. There https://smart-power-point64764.blogoxo.com/34969577/how-much-you-need-to-expect-you-ll-pay-for-a-good-smart-power-points