Lighting Fault - mystery 3 core

[davidjtown]

I’d say without doubt they’ve done something ?.....be careful here mate as once you start working on it you are assuming responsibility for the installation, and homeowners also won’t buy it that although yes it worked before it’s not my fault it’s not now ?.....and what led you to this light after fault finding what bob and his mates did??

Yes, just what I thought. There is a newer t&e coming in from the top (sleeving just inside grommet) and an older one at the bottom. One feeds the pendant and the other for the wall lights. Then there is the 3 core. Neutrals in the connector at the back of the switch so I assumed (maybe wrongly) that the lighting was fed at the switch rather than ceiling rose or JB.

Client asked me to write a report on what I had discovered but I am reluctant. Thoughts?? ?

 

[Vortigern]

You simply have to know what those wires are coming in/out and identify them so that you know exactly what is going on. Maybe a board or two up and short each wire at the switch and bell out some likely wires above or below. How can you report on what you don't know? Take your time don't panic. It is quite satisfying working these things out.

 

[davidjtown]

You simply have to know what those wires are coming in/out and identify them so that you know exactly what is going on. Maybe a board or two up and short each wire at the switch and bell out some likely wires above or below. How can you report on what you don't know? Take your time don't panic. It is quite satisfying working these things out.

Good advice, thanks.

 

[davidjtown]

For info, I fixed the problem. There was a broken neutral in the 3 plate under the floorboard upstairs. They’d used the 3 core to feed at the switch with Line/Neutral and used the third core as a switch line for one of the dimmers. Still not sure about the mystery 150V ??‍. Also, one of those cables was feeding the door entry system in another room. Never seen that before either.

Anyway, all sorted now. Thanks for the advice, really helpful. ?