Dodgy wiring

[andyb]

Shouldn't take too long. It looks like someone has taken a live and neutral from the switch, as there was no neutral there they used the cpc of the switch wire. Disconnect the live and neutral coming away from the switch, not the 3 core or the switch wire, and see what doesn't work. Should tell you what's happened.

 

[sparky1508]

Did you disconnect the neutral of this circuit at the board before testing?

Disconnected all 3 conductors for testing once I saw how it was wired at the first lampholder. That's how I figured it had neutral earth connection as IR test failed on neutral to cpc.

 

[sparky1508]

Well going by your drawing it's 3plate and if it's been wired like that at every ceiling position, the interconnection will be at every point? you have trouble, you need to drop every rose and look. It can't be left.

It's not like that at every point. The first one in the toilet is fine, the second in the hall just has stranded 3 core flex coming out of a hole then there's this one in the living room, then a dining room and kitchen which are both wired standard 3 plate so this is the only one I have issues with.

 

[telectrix]

came across something like this some years ago. what had happened was that an outside light had been wired from the hall light switch and the guy who did it realised there was no N at the switch so he used the cpc of the switch drop, connected it to N in the rose to get a N at the switch.

 

[gazdkw82]

Id start by drawing a proper wiring diagram going from light to light and then work out what's going where. If you can narrow down which is the feed from the previous rose and which is the feed to the rose it means you only have to figure out what's going on between the rose in question and the switch.

Thay being said, if all cieling roses are like this one you have your work cut out