Insulation Resistance testing procedure

[DaveS]

Hi all

Am doing 2394/95 at moment and trying to get procedure firmly stuck in head. Thing I'm getting a little bit confused with is with some of the vids/examples online some state to switch main switch on (obviously before supply connected) and others off. My thinking is that you might as well always leave off as you will only be testing from the load side terminal of this switch anyway? What would be the other reason for leaving on. The other thing not to sure about is why the need to link N and L terminals at board in some instances doesn't just testing outgoing live and earth bar give a complete reading. Sorry if missing something really obviously long day!

 

[telectrix]

1.you r IR tests should always be done with the main switch locked off and the installation isolated.
2. you link L-N in the DB and test from LN - E if you have any equipment on the installation that may be damaged by the test. e.g. any IT gear, boiler PCBs, TVs etc.

 

[Leesparkykent]

https://m.youtube.com/watch?v=eRE_8njFxZs

On this video he tells you to turn the main switch on because this is an initial verification before the tails have been connected. Other than this situation it's done how tel has said.

And this video below is an IR test on a 3phase installation.

https://m.youtube.com/watch?v=yyLsBfTdxOw

 

[DaveS]

Cheers lads just think I'm nit picking a bit really. Had checked them vids just think I need to watch how question worded and make sure I explain clearly also clarify when testing thru sensitive equipment and linking out

 

[Deleted member 72666]

Also make sure you tell the examiner that you've carried out insulation resistance testing with all cpc's connected.

 

[DaveS]

Cheers sam

 

[DaveS]

Stan even lol

 

[Billythekid]

Just think in a logical manner, you'll get it ingrained in no time.

also remember: check where conductors go, before sending 500v through them - I've seen this done a few times now.

 

[Deleted member 72666]

Cheers sam

I've got to agree that 'sam's' advice was better!