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Hi all,

I was hoping to sneak in a little job late this afternoon - changing a faulty bathroom pull chord for an outside switch plate. No problems with access. Straight forward enough.

House is almost certainly post 60's. CPC's present in lighting circuit.

Live Zs = open circuit.
R2 test with wander lead from MET to as many lighting JB's in the loft I could find = 60 k ohms.

So there is some sort of reading.

Loose connection?

Back tomorrow so any advice on where to start always appreciated.

It looks like the lights are wired in single line + cpc, looped in an out using every which method you can think of, and a neutral looping around each load.

Like I said - where to start.

There are other circuits available in the loft - I could bridge across from 1 JB to another with some 4.0mm if I have to (I suppose).
 
Does the home owner have the certificate for the installation of the CU? The schedule of test results could make interesting reading

I’ll ask. I was thinking that because I was getting 50k ohms rather that complete open circuit that the install designed to be earthed but something has gone wrong somewhere. I have already sorted out a couple of tapped up connections outside of enclosures - that sort of thing.
 

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