Insulation Resistance Testing

[tommys88]

Evening chaps,
In the process of taking my 2394/2395 testing course and just trying to fully get my head around insulation resistance testing predominantly in occupied domestic property's where it isn't possible to dissconnect all loads from the circuit.
I am aware of the need to link out the line and neutral to then test to CPC, by linking out what would people recommend the best way to do that is a simple crocodile clip from the busbar to neutral bar?
Then is it a case of having all breakers on and testing all circuits on the rcd or best to individually test at the top of each mcb?

Cheers

 

[DPG]

Blimy that's not good. What did supplier day? Presumably they had other reels with the same problem if they were from the same batch.
Daz.

 

[kingeri]

Blimy that's not good. What did supplier day? Presumably they had other reels with the same problem if they were from the same batch.
Daz.

I remember they were a bit funny about it actually, they swapped it, never heard anything else about it. Does anyone else IR test new cable BEFORE installation or is it just me?

 

[Midwest]

I remember they were a bit funny about it actually, they swapped it, never heard anything else about it. Does anyone else IR test new cable BEFORE installation or is it just me?

Nope, might do now, I always IR my new installations, but then the horse has bolted

 

[Pat H]

Good idea to test new cable. I haven't but think I might.
Re IR tests I prefer to test each circuit. For the time it takes to test 6 or 8 circuits its my preference.
But in a normal size domestic even a parallel test I'd expect to get a sensible reading never seen 2meg or close to it unless a fault.

 

[westward10]

I remember they were a bit funny about it actually, they swapped it, never heard anything else about it. Does anyone else IR test new cable BEFORE installation or is it just me?

Used to do it with MI, not a bad idea to do it with any cable.