Fitted a light and now others will not work

[SUNRAY]

Hi

I have attached a photo and there are no other wires located around them in the loft.

View attachment 210877

Seems to be just like RF predicted.

I don't see earth wires on the blacks.

 

[terryplumb]

Terrible picture Ged. Does the earth conductor originate from the same sheath as the red ,or are they totally seperate.
Trim the two black conductors and fit both together in a terminal block
( Hopefully you have some). Put the red in a seperate terminal block. And the earth conductor in a third terminal block.
Power back on ,and see if the lights in rooms that didn't work ,now work.
Either those two black conductors were not making good contact with each other ,or one has the copper snapped inside the insulation ,or there is a problem elsewhere not connected to you fitting your new light fitting.

 

[Ged Kehoe]

Terrible picture Ged. Does the earth conductor originate from the same sheath as the red ,or are they totally seperate.
Trim the two black conductors and fit both together in a terminal block
( Hopefully you have some). Put the red in a seperate terminal block. And the earth conductor in a third terminal block.
Power back on ,and see if the lights in rooms that didn't work ,now work.
Either those two black conductors were not making good contact with each other ,or one has the copper snapped inside the insulation ,or there is a problem elsewhere not connected to you fitting your new light fitting.

In the same sheath as the red. No David Bailey me.

 

[SUNRAY]

In the same sheath as the red. No David Bailey me.

I'd have hoped the blacks have an earthwire too.

 

[sparkwright]

I wouldn't expect the blacks to have an earth wire.

The red should, as the reds loop in at the light switch, and provide an earth point there too.

This is precisely the wiring RF described. You don't get this wiring set up down South often, if at all.

 

[sparkwright]

One black wire has exposed copper where it shouldn't.

Is the wire broken here?

 

[Ged Kehoe]

Probably have to get a spark in methinks.

 

[sparkwright]

One black wire has exposed copper where it shouldn't.

Is the wire broken here?

 

[Ged Kehoe]

No, just checked.

 

[sparkwright]

Sometimes the copper can break inside, and it's not obvious at first.

Other things:
Anything else been disturbed?

Any light switches been loosened off for decorating?

Any holes recently drilled in walls?

Can you remember how the old light was wired?

Any switches not turned on at mains? (RCDs can trip while electrical work is being done and go unnoticed).

 

[Ged Kehoe]

Sometimes the copper can break inside, and it's not obvious at first.

Other things:
Anything else been disturbed?

Any light switches been loosened off for decorating?

Any holes recently drilled in walls?

Can you remember how the old light was wired?

Any switches not turned on at mains? (RCDs can trip while electrical work is being done and go unnoticed).

No, everything was fine yesterday. Took the old light fitting down attached the new one and two rooms will not light up.

 

[Ged Kehoe]

This is it wired up to a block.

 

[sparkwright]

Got to be a broken wire somewhere, at a guess.

 

[Ged Kehoe]

Got to be a broken wire somewhere, at a guess.

How would I find that?

 

[sparkwright]

Are the copper ends of the wire nice and strong, and not at snapping point?

Is it possible the insulation is catching on the terminal screws?