Multiple Light Wiring Diagram Ceiling. Loop in neutral switchline earth. It shows the components of the circuit as simplified shapes and the capability and signal friends between the devices.
I like to use the term daisy chain. The live terminal is fed from the consumer unit and in turn gives live power to the other cables in the circuit in this case 1 supplies the live power from the source where it is taken by cables 2 and 3. Cable d fig 2 is a three core and earth this is the 3 wire control that links the two light switches together.
As with the other diagrams on this page more lights can be added by duplicating the wiring arrangement between the fixtures.
The following is the simple schematic of a three wire 2 way switch wiring. Tighten the mounting screws. Loop is not required at the new light as this is only used to join the incoming power and the switch cable neither of which exists at the new light. This diagram shows the additional cable connected to an existing ceiling rose.