Insulation resistance problem

[sparky1508]

To the OP - Welcome to the forum

Well its all good experience and you have had some sound advice given by experienced and knowledgeable folks here on this forum. So hopefully you have not taken things too personally.

Going back to your testing, hopefully you have now found the problem. Fingers crossed you have not inadvertently fried some sensitive equipment. Its easy done if you have missed isolating it from the circuit you are IR testing between L - N @ 500v.
But taking a positive from it, at least it may help you to understand exactly why and what you looking for.

No offence but a lot of inexperienced sparks tend not to understand exactly why they do the tests and what they reveal. The test result guides are there for you to compare against what is expected from a satisfactory installation. Interpreting the results if they are out of range is where experience and a sound understanding of the testing procedures is a must.

Thank you and no offence taken. It is a good learning experience has helped me understand more. All the advice from the guys on here also very helpful. Just need to keep learning as I know it takes time.
Thanks again☺

 

[Octopus]

and just to add, unless you are very lucky, fault finding (properly) takes time. You need to be able to confidently set a customer's expectation that it could take hours and therefore cost a lot.

Just last week I was fault finding a socket (ring) circuit in a rambling, extended house. After 4 hours I found the fault and couldn't fix it! The section of damaged cable was under a recently made solid floor!

The MCB was downgraded and the "damaged" section was isolated, so they now have 1 radial with 2 cables at the OCPD!

 

[davesparks]

and just to add, unless you are very lucky, fault finding (properly) takes time. You need to be able to confidently set a customer's expectation that it could take hours and therefore cost a lot.

Just last week I was fault finding a socket (ring) circuit in a rambling, extended house. After 4 hours I found the fault and couldn't fix it! The section of damaged cable was under a recently made solid floor!

The MCB was downgraded and the "damaged" section was isolated, so they now have 1 radial with 2 cables at the OCPD!

Or it turns out like my one yesterday, I did the full explanation of how it could take any length of time, why I don't provide a quote, only an estimate etc etc. We arranged a day when there was no matinee show and got someone to open up the building early for me.

Then I had the fault found, fixed and everything back on and working within 1/2 and hour!

But on the up side they asked me to quite for a lot more work there and then

 

[richy3333]

and just to add, unless you are very lucky, fault finding (properly) takes time. You need to be able to confidently set a customer's expectation that it could take hours and therefore cost a lot.

Just last week I was fault finding a socket (ring) circuit in a rambling, extended house. After 4 hours I found the fault and couldn't fix it! The section of damaged cable was under a recently made solid floor!

The MCB was downgraded and the "damaged" section was isolated, so they now have 1 radial with 2 cables at the OCPD!

Nooooooooo! That will fry the brains of certain forum members!

 

[westward10]

Mmm, let's discuss it.

 

[Andy78]

Mmm, let's discuss it.

Nope. One thread is already well and truly hijacked for that purpose.

 

[westward10]

Do you say scone or scone?

 

[Andy78]

Do you say scone or scone?

Scone. Notice how they are written the same though so anyone reading them should not be capable of making a mistake unless they have problems reading

 

[Octopus]

Mmm, let's discuss it.

Nothing too discuss. Simple radial circuit.

 

[westward10]

I knew you would have to be different and say scone.:vanish: