Insulation Resistance

[Jamieblade1]

Hi guys,

I've recently just completed a rewire of a small 2 bed bungalow consisting of 4 circuits. I have tested the kitchen ring and it has tested fine, the same with the lighting circuit. On testing the heating circuit and general ring main, the insulation resistance between L-N on both circuits is 0.3 Mohms. Between L-E and N-E they test fine at over 200Mohms. I have looked for the obvious i.e nails through cable in capping etc twists and kinks in cable. The cables move freely in the capping when pulled. The 1.5mm supplying the fused spur in loft for the heating is no longer than 6 meters in length. The general sockets however, I have split the ring down to find the leg which is causing the low reading and it seems to be the supply from the consumer unit to the first socket. But as I've said there are no nails, plaster, clips or anything on the cables. Really frustrating now, especially as the bungalow has just been skimmed!

Any chance it could be faulty cable?

Any help will be greatly appreciated.

Cheers

 

[dazza1981]

Something ain't adding up here mate, as dill said if you have identified what leg it is then what's the problem or am i missing something ????
Surely as you did the wiring you know all routing of cables you would be in a good position to sort it.
Im not sure i can add anymore to the advice already given tbh.

 

[Jamieblade1]

Yeah I have identified the leg and will sort it but as I said, I just thought it was slightly weird how the heating supply and first leg had identical issues that's all, that's why it was confusing me and wanted a second opinion.

 

[Brightspark2]

Have you disconnected the cables from the DB then carried out the IR test?

This....

 

[7029 dave]

As mentioned, strip it down on the said section,ir test direct on the cable in question, both ends(I would) to prove cable.

 

[Octopus]

Yeah I have identified the leg and will sort it but as I said, I just thought it was slightly weird how the heating supply and first leg had identical issues that's all, that's why it was confusing me and wanted a second opinion.

Hum, that does sound a bit of a head scratcher. Have you tested for continuity between both sections of cable?

Please do update the thread with what you find.

 

[jimjimjim]

Something common to both circuits. The D/B, your test meter or you.

Jim

 

[Deleted member 9648]

So what was the outcome?