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I am running a new light from a ring main socket. I have run 2.5 to a FCU with a 5amp fuse then 1.5 to a switch and from the switch to the light. When I put the fuse in at the consumer unit the light comes on but as soon as I throw the light switch the fuse blows in the FCU. I have double...

I am dividing a room in two and would like to add a separate light fitting and switch. I have wiring from the 1960s. The light switch already there has only a red and black (no earth) which runs to a junction box which is inaccessible. The red is permanently live. The fitting has a red and black...