A.Lee explained on 14/01/2011 :
I've done a bit of testing this afternoon, and found a fault on a ring
main.
Continuity results:
E-E 0.40 ohms
N-N 0.19 ohms
L-L 37 ohms - clearly a fault here.

Connect to one end of the ring live with the ring parted, then work
your way along with a long wire with a 13amp plug fitted temporarily on
the end - check each socket in turn, until you find a sudden variation
in impedance. That should make localising it easier.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk