On 27/04/2018 00:01, Dave Plowman (News) wrote:
In article ,
ARW wrote:
OK so they removed a door chime to plaster a wall.

No big deal, however they did not know that it was powered by a mains
powered transformer that was under insulation.

No attempt was made to isolate the bell wires and IMHO for the last two
days the bell wires have been touching resulting in the transformer
overheating and causing a small fire that took out several T&E lighting
cables before the MCB tripped.

Good grief. I'd expect a transformer like that to have a thermal fuse
inside the winding which would rupture long before the transformer
overheated.

That was my thought, and I thought there was a requirement for one. If
not there ought to be.