No power through ceiling rose

[smartin1612]

Found it - short circuit!

7 frickin days I've lost to this, with the two main rooms upstairs in darkness, not great for home workers, the amount of meetings I've held looking like something on Halloween...

I made mention of my Asrock pc build back in 2005 - it was terminals:

My Asrock motherboard had a bit too much solder on the back of the circuit board.
It worked outside the case, but the moment I installed it, nothing. No power, no resistance, nothing. No CMOS, no BIOS.
Take the motherboard out, and the pc would fire-up.
Took me two days to resolve, and was only as I was about to send back did I discover it: the screw in the middle of the motherboard was pushing the board down just too much, it was contacting the case and shorting.



Double-checked the terminals of the lampholder and sure enough pushing the netural away a bit, the lamp fired up.


Netural was too close to live and was shorting, though not killing the rcd - gotta look into that.

 

[smartin1612]

So just to clarify the new lampholder does not function at the rose nor the wall outlet but you know the spotlight is good because you have proved this at the old spotlight track.

Yes, that's correct

 

[westward10]

Can you show this apparent short.

 

[smartin1612]

Can you show this apparent short.

How do I show the short?

As explained, pushing the neutral terminal further away from the bulb allowed the bulb to fire - obviously I had to make the mod with the bulb out and keep testing until I'd found the sweet spot - too far away annd the neutral wouldn't connect too close, and whilst the bulb would contact, it wouldn't power on.

 

[DPG]

I can't picture where this short was.

Presumably the fuse blew or MCB tripped?

 

[mainline]

I can't picture where this short was.

Presumably the fuse blew or MCB tripped?

I think there is a little confusion between what is a short and what's an open.
I think the OP should put a multi meter on his Christmas wish list

 

[smartin1612]

I can't picture where this short was.

Presumably the fuse blew or MCB tripped?

The light came on only after I moved the neutral terminal away from the side of the bulb. It has just occurred to me that I didn't explain the lamp fixing type - these are screw bulbs.

So as the neutral would've been in contact with the side of the bulb regardless, I can only assume that neutral was contacting live, although the rcd wasn't tripping out so still trying to work that one out

 

[smartin1612]

I think there is a little confusion between what is a short and what's an open.
I think the OP should put a multi meter on his Christmas wish list

Rude.
And what makes you think I don't have a multi meter?

 

[mainline]

The light came on only after I moved the neutral terminal away from the side of the bulb. It has just occurred to me that I didn't explain the lamp fixing type - these are screw bulbs.

So as the neutral would've been in contact with the side of the bulb regardless, I can only assume that neutral was contacting live, although the rcd wasn't tripping out so still trying to work that one out

If the neutral was contacting Live it would be the mcb that went.

 

[mainline]

Rude.
And what makes you think I don't have a multi meter?

Because you're working with Mains electric and wiring plugs etc when you could have used your multimeter instead.