Insulation resistance testing with no cpc

[bigbaddave]

When doing a CU change and lights have no cpc. Every room has class 2 dimmers and lights. ceilings are like 20 foot tall. How would you guys go about Insulation testing? L&n to cpc ain't an option and removing all lights and bypassing dimmers is consequently going to take some time... What would you do? Alternitavly ill quote for the time it will take to to do it properly! Basic n-cpc for initial test came back at 67.9m oam


"Apparently they are awaiting on inheritance and will have lights rewired when it comes through"

 

[telectrix]

N/A seems appropriate.

 

[bigbaddave]

You would be happy to note that on cert?

And do you ever sleep ??

 

[telectrix]

obviously with a note on the cert. and a sticker on the CU. i meant the N/A would be entered on the sotr.

 

[bigbaddave]

Sorry.. Sotr?

 

[richy3333]

"Apparently they are awaiting on inheritance and will have lights rewired when it comes through"

Is it the lack of CPC which caused them to 'cop it'

 

[bigbaddave]

Nope.. I think if it was they would see the impotence and get it installed

 

[bigbaddave]

Sorry that should of been importance.. Predictive text keeps picking up on the text I keep sending my GP

 

[Guest55]

you can still do ins. res. tests between L & N upto the switches with the switches in the off position.
i would at least do that than no tests at all.

 

[Stuuk1]

Do the IR test on 250v DC with the dimmer still in the on position. You just need to make a note that you did this because of that reason.

However, that's lazy so just disconnect the dimmers..

 

[Guest55]

Do the IR test on 250v DC with the dimmer still in the on position.

eh ?
between L & N any tests with switches on will only read a short across the lamp filaments.
doing the test at 250v will make no difference.

 

[Deleted member 26818]

The fact that there is no CPC is not really a good enough excuse for not conducting an IR test.
Yes where there is sensitive equipment which could be liable to damage, testing between the live conductors and the CPC is acceptable.
However in this instance, there is no CPC available.
As such you sould just bite the bullet and disconnect or link out the sensitive equipment.
As for the lamps creating a short.
They don't create a short if they are removed.

 

[telectrix]

The fact that there is no CPC is not really a good enough excuse for not conducting an IR test.
Yes where there is sensitive equipment which could be liable to damage, testing between the live conductors and the CPC is acceptable.
However in this instance, there is no CPC available.
As such you sould just bite the bullet and disconnect or link out the sensitive equipment.
As for the lamps creating a short.
They don't create a short if they are removed.

no but they create a bit of a bang when you drop them off the top of your stepladder.

 

[Octopus]

At the very least, take out the bulbs and link out any dimmers. If there's no CPC the IR could be terrible and you need to know this.

 

[trebor]

why do say that lives joined together and test to cpc is not an option, the cpc if it was present would be connected to the MET to include any parallel earths, the joining together of the line and neutral affords the protection for vulnerable equipment, if the I/R test is ok to the MET then no problem, it would then just be a case of checking that all fittings etc are Class 2 at present and advising on a lighting rewire in the future which you have already done

When doing a CU change and lights have no cpc. Every room has class 2 dimmers and lights. ceilings are like 20 foot tall. How would you guys go about Insulation testing? L&n to cpc ain't an option and removing all lights and bypassing dimmers is consequently going to take some time... What would you do? Alternitavly ill quote for the time it will take to to do it properly! Basic n-cpc for initial test came back at 67.9m oam


"Apparently they are awaiting on inheritance and will have lights rewired when it comes through"