AM2 ring fault-finding headache

[mak]

How would I pinpoint a fault on a ring circuit with very little resistances, and without any visual clues, only by measuring.
Say I have a break in neutral between db and first socket. How would I go about fault finding it?
1. I will use low resistance ohmmeter.
2. I will find that rn is not a ring.
3. I will do the Rn+R2 and whichever socket has the highest resistance the fault has to be in between the two sockets(or db) with lower reading?

Then if I have a short on neutral and earth, again between db and first socket.
1. I will do insulation resistance test between L-N, L-E, E-N on both legs and find the reading on E-N.
2. So the fault is the earth fault between neutral and cpc conductor.
3. But how will I pin point it? With the Rn+R2 test again looking for the highest resistance?

 

[Lister1987]

AFAIK they take the circuit to like a panel box with switches in it . Their they can simulate an on circuit with a switch, for a high resistance they would add a resistor, for a short they could use a 2 way light switch - one side clear other side shorted.

You could make up your own test rig board?

That's what I am doing,, it's a shame I can't get hold of the assessors guide to test rigs as no doubt that'd detail everything ?

 

[pc1966]

Make your test rig a bit more realistic - get the local builder to put in the circuits and then you have to try and fix them!

 

[Lister1987]

Make your test rig a bit more realistic - get the local builder to put in the circuits and then you have to try and fix them!

Shots fired ?