You would think a simple enough task to fit a light in a room that I just decorated, sadly not. Ceiling light works with (old school wiring) both lives into COM both neutrals into L1 and both earthed. When I switch the light off it trips the circuit. Any ideas?
If you think that is correct in any way, you need an electrician. Can you provide a picture of your *****-up.
I assume the light has one cable? One pair is a feed one pair is a switch wire. As it is you have both lerm and swith together giving light. You switch on the cause a dead short
I would think the neutrals should be together in a block connector. One live into COM and one into L1 on the switch.