On 16/07/2019 23:05, Mathew Newton wrote:

Measuring the L-L and N-N resistance on a ring circuit is giving me
0.7 and 1.1 ohms respectively. Does this point towards a poor/loose
neutral connection in the back of a socket somewhere?

Quite possibly, or something else not quite right.

If so, is there
a good way to locate where through testing as opposed to removing
each socket for direct inspection?

You could go for a "binary chop" type approach. Disconnect the ends of
the ring at the CU, and short L & N & E of one end together. Now using a
plug as a test point, plug it in somewhere on the circuit near to where
you think the middle might be. You can now check if the L to E and N to
E match. Whether they do or don't, you have just eliminated half the
circuit. Go half way again in the appropriate direction, and you can get
rid of half the remaining ones again. Should take no more than Log_2(n)
tests, where n is the number of sockets on the circuit.

Something like one of these makes the job easy:

https://www.amazon.co.uk/Kewtech-KEW.../dp/B0058HZLTK

Needless to say, make sure the socket you are testing at is on the
disconnected circuit, since test meters don't appreciate mains across
their probes when on a resistance range.



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/