by Mr White »
Mon Apr 09, 2018 10:33 pm
Nice diagram. Pity more folk do not do that when asking questions like yours, it makes life much easier.
If you look at your diagram you will see that the switch is connected directly across live and neutral, when you operate the switch you are putting a dead short across the supply, this is why your MCB trips (it is supposed to)
This is where I have to admit envy of your diagram, I do not have the facility to draw like you.
The light with 3 cables.
The live (red) from the consumers unit, should be connected directly to the live (brown) that goes to the switch. (You will need a single connector block for this.)
The switched live (Blue) from the switch should connect to the L in the lamp NOT the N (where it is now) It should also be marked at both ends with brown sleeving to indicate it is live.
The wires from the first light to the second light stay where they are.
If you post another drawing as I have said, I will check it is right for you.