We are currently re-wiring a run down house, just your average 3 bed end terrace. Everything inside it electrically pointed to it being some sort of old commercial business, EM lights dotted about for one. but according to the new owner it wasn't, he said an old bloke lived there that was a bit mad, nothing shows up on Streeview either showing it anything but a house. I could have taken many more photos of things but this is the sort of stuff he got up to apparently.
That one is my favourite, screwed to the underneath of a floorboard, fed in alarm cable so maybe some sort of booby trap.
Secuirty light switching
Cables everywhere, these were for the CCTV
Backdoor
All that was left of the shed, it was full of electronic stuff apparently, would have loved to have a look around it but it was gone before we turned up.
And lastly a bit of switch wiring
Looks normal but it was years old and wired about 30 years ago or more, those cables are twin and earths, not 3 cores with the grey cut out. Where the hell did he get black and brown cable from?