Light bulb blew an tripped breaker.

Out of curiosity Christopher ,at what point did the light bulb stop working ? When you turned a switch on it didn't come on ,at that point did you hear a popping sound ,and then find all other lights not working and MCB had tripped ?
Or some other scenario completely ?

 

So when you noticed the hall light suddenly stopped working ,were all the other lights on the circuit still working,before you looked at the MCB ?
In other words ,is it possible that the hall light is the first light that you NOTICED went off ,and before you looked at the MCB ,all other lights were off as well ? What I am getting at is could the fault be elsewhere ?

 

Haven't put any pictures up lately have you?

 

Thanks Chris. Nothing obvious there.

Still no sign of a permanent live.

 

Just follow my advice, I am the one with the Milwaukee underpants and the Packout.

 

What was the outcome. Did you change the rose? Did it work out?

 

In your first pic of upstairs switch,there is a black insulated wire coming in with the reds ,but it's not connected to the switch. Where does it go to and how is it terminated ??

 

On the top photo is that the conduit that goes down to the switch in question?

Looks like a threaded end which might be rough and catching a cable somehow, maybe?

 

When you replaced the pendant did all the cables look clean, no black Mark's or anything by that thread?

 

You need to work out which cable in the nearest junction box to the light is the one feeding your light, and then check the terminations at each end of that cable to see that they are terminated properly and not damaged.

Assuming it’s fine, you may need to pull the cable back from the light, out of the conduit, to the nearest junction box to check it. If you do that, make sure to tie a drawstring onto one end so you can replace it / pull the original cable back in if it’s fine.

If that doesn’t identify any issues, you can either work further back along the circuit checking as you go. You’ll need to be pretty methodical about it.

This all assumes you don’t have any test equipment ?

If you don’t want to do that, you may need to call a spark.