The earth wires have been omitted for clarity and would want to be related in any way switches and ceiling roses. The wires would even be included with the protecting outer sheath (cable). In case you have any considerations, Talbot suggests homeowners seek the advice of a accredited electrician when https://safe-electrical-wiring33210.alltdesign.com/the-greatest-guide-to-smart-light-switch-white-clear-frame-53855525