Intermittent Ring fault! Any advice please.

Charlie_ · Jul 9, 2019

Keep clean
Weil’s Disease is one of the nastiest things out there

kmulcahy1994 · Jul 10, 2019

UPDATE! Found the fault. Tested between neutral and earth, however left cpcs in earth bar to see if it was shorting on another circuit or pipes. Tester showed dead short. Traced cables and found they run behind the boxing in for rad pipes. Took off rad cover and there it is in front of my eyes the leg that had been squished.... therefore shorting on to the neutral.... replaced leg of ring and re tested. All good. Must of been plumber who chsnged the stats on the rad cover and squashed the cable wheb putting the cover back. The reason it was tripping every so often was because there was a play centre cabinet for the kids and everytime the kids would push the cabinet it would push the rad cover into the neutral. IR reading are 10megaohms which is not that great but the cable run they have used goes under the floor after the boxing in. All is good now, thanks for everyones help! (Also attatched some pictures)

kmulcahy1994 · Jul 10, 2019

Lucien Nunes said:
This is typical of a chewed or punctured cable where there's a tiny airgap between the conductors, large enough to not flash over during the IR test but small enough to short out when anything expands with heat or other minor disturbance happens.

Have you tried testing it at 1000V?

Thank you, disturbance was the kids unfortunately

telectrix · Jul 10, 2019

looking at those pics.are you sure wet-pants didn't nail the cable after you'd questioned his parentage?

Risteard · Jul 10, 2019

kmulcahy1994 said:
UPDATE! Found the fault. Tested between neutral and earth, however left cpcs in earth bar to see if it was shorting on another circuit or pipes.

I don't mean to be unkind, but why did you test without the cpcs connected to the means of Earthing before? It is a requirement of the Wiring Regulations that they be connected when conducting the test.