I've got a fuse box that is half for RCD and other half not.
One of my downlights got too hot and melted (touching insulation - I've just moved into the house) so I needed to replace it.
I switched off the trip switch that is for that downlight circuit and checked that no other lights went on. I even used a live circuit checker. No current.
Then I snipped the wire that had burned and the whole box tripped.. guessing it is the RCD that tripped. But my question is, should I be tripping the whole box to work on the electrics or is it safe to work with wires that have a residual current going through? i.e. changing the light switches?