This morning our dining room lights (one central fitting) didn't come on,
they worked last night. I have done some investigating as far as my
electrical knowledge is concerned.
1. The MCB hasn't tripped, all other downstairs lights work, I know the
dining room light is on the same MCB as I replaced the light fitting about 6
2. The fitting is OK, (I have for the investigation swapped it for a pendant
fitting I know works).
3. Lamps OK
Coming out of the ceiling there are only 3 wires, Red, Black and Earth,
connected to a connector block. Both switches (one at either end of the
dining room) are wired the same i.e. Black (No.1), Red (No. 2) and a further
Red to Common, in one switch this Red is 'flagged' with white tape.. I
cannot see these connections as being the problem, the lights have worked
perfectly since the house was built in 1992.
4. Power is getting to the connector block (Red) at the ceiling, when
either switch is used.
5. I have checked continuity between the connector block and the switches,
using a 'bleep set'. Live OK, Earth OK, but I have *NO*
the connector block and Neutral at either switch.
6. I have also tried continuity between the Neutral at the connector block
and all 3 connections in both switches (one Black (No.1), one Red (No. 2),
and another Red (Common), I have tried this with both switches turned on
My (uneducated) feeling is that the Neutral connection has 'come adrift'
I get continuity between the connector block and the
switch(es)? Is my assumption correct if so how can I determine where from.
My upstairs floor is made from those large chipboard sheets so it will be a
major job to lift them so I would be grateful for any pointers in the right
direction before I get the saw out!