Discuss Fault on Ring final circuit in the UK Electrical Forum area at ElectriciansForums.net
The L-N of near-zero on IR could be a fault, but it could be some load you have not found to disconnect (e.g. fridge with socket behind it).Right side
L-N 0.00
L-CPC 0.17
N-CPC 0.15
L+N -CPC 0.15
This suggests to me that I have a dead short on the live side somewhere? Is that correct? Even though L-L continuity seems to be OK as testing at o.81 ohms today.
r1 Live to live 0.96 ohms
rn Neutral to neutral 0.75 ohms
r2 CPC to CPC 1.9 ohms
L+N-CPC 29.0 (presumably MOhms)
It looks like the pump you just disconnected. Test it separately and see if low IR to E, most likely water in somewhere!L+N -CPC 29.1
Bemused. Will break the circuit at a socket now.
That is good.Right, I have connected CPCs back to the earth bar in CU. Put both live and both neutral from the ring into a 5 way wago, with a new wire out from it to test. Put green lead from Megger on the CU earth bar and red onto the lead from the wago connecting ring together. Insulation resistance test on that gives 35.8 M Ohms.
Can't you IR test at its plug?Right. Checking the pump is not so easy as the inspection hatch is a two man lift, as it is an inspection cover filled in with stone.
That is encouraging!However, I have reconnected the ring main back into the CU temporarily using Wagos and it has not tripped so far.
Do a quick L-E and N-E test using the clips on plug pins.Right. Checking the pump is not so easy as the inspection hatch is a two man lift, as it is an inspection cover filled in with stone.
No need for line to neutral IR tests. As it stands those readings are above minimum limits.
I think we all suspect that is not really the cable alone, and something is still connected. But the L/N to E are now good with the pump unplugged, so the culprit would now appear to be cornered awaiting the electron police...They aren't, post 26 states line to neutral is 0.01Mohms
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