A friend of mine had the fuse in her lighting circuit blow last night. When I say fuse I do mean fuse, she has an old Wylex fusebox dating I guess from the early eighies when the flat was converted, with proper fusewire. I'm talking about this sort of thing http://www.flameport.com/electric/old_equipment/wylex_standard_brown_wooden.cs4 I replaced the fusewire in the cartridge for her today, and everything is working again.
Question 1: I was a bit concerned when she told me what triggered the trip. She was on her way out of the flat, she had her keys in her hand, she went to turn off the light at the switch, and as the keys brushed against the switch there was a blue flash and everything went dark (she didn't get a shock). That sounds rather scary to me, any ideas what could be behind this?
Question 2: Subject to the whole place not being condemned as a deathtrap by your answer to question 1, I think as a minimal nod to bringing the arrangements up to a reasonably modern level it would be a good idea to replace the fusewire cartridges with RCBOs. Is this actually doable, and if so can anyone point to the type of RCBO that would fit?