IR test results.

[DNS1]

Hi guys,

Tested my new kitchen circuit today, all results as expected for a new RFC except the IR between line and earth.

The resistance between line and neutral and neutral and earth is >1000 MOhms as expected, but between line and earth it's in the region of 3 MOhms.

After disconnecting parts of the RFC and re-checking, I've found that the insulation fault lies in one leg of the ring which runs above a ceiling and comes out in the new kitchen (this is the only re-used piece of cable from the previous installation).

I know it's not a major issue as it's "ok" according to the regs, but I'm wondering what's causing the problem.

Any suggestions for me?

 

[telectrix]

if you've had plastering done, it could be damp. could also be a JB above ceiling or a problem in an existing socket.

 

[GLENNSPARK]

cable "nicked" perhaps?...

 

[GLENNSPARK]

maybe....check all accessable joints/areas first..........

 

[trev]

Dammit Glenn that was my idea

 

[DNS1]

I've removed a JB today in the offending section and crimped the ends instead, but no change to the readings.

As far as I can tell there are no other joints in the cable, it's just a straight run through a void above a downstairs ceiling.

No plastering done recently either...

Thanks for the help guys

 

[GLENNSPARK]

can a new length of cable be pulled in...using the old as a draw wire?........if so then IR the length of new cable you plan to pull in first wont you....just to be sure as its a sod....doing the job twice that is..lol.....

 

[GLENNSPARK]

Dammit Glenn that was my idea

sorry Trev mate.....

 

[Knobhead]

Got to go with Glen on this one. OK it passes muster, but are you happy with it? I wouldn’t be. For the price of a few meters of 2.5 T&E and a bit of time I’d rip it out.

I also hate to say this but what about the rest of the installation? It could be you’ve just found the odd bit or cable that’s got a nick in it, but….

All right I can be a wet weekend at times.

Have a nice day

View attachment 10843

 

[Lee Marshall]

id run a new cable, sounds a bit iffy. dont want a new kitchen in and then thigns starting to trip