Am2 IR test failed on the global test

[Jakegood]

hi all,

Failed my AM2 on IR test.
Just a query do you have to remove both the nuetral and the cpc fly lead from RCBO when doing a global test? I did this but I did not put the cpc from the ring final in to the MET bar. I tested the ring circuit, motor and strappers separately. That’s the only thing I didn’t do. Would this be a fail?

 

[Ian1981]

The cpc of every circuit MUST be connected to the source of earthing during an Insulation resistance test.
You can’t really do a global test with Rcbo’s

 

[Gavin John Hyde]

my understanding of the fly leads on rcbos is that the fly lead should be removed prior to a IR test unless the manufacturers paperwork that come with them say its okay to do with it connected. Having said that I have oftne tested with it connected with no noticeable impact. In a exam though its by the book. Some of the newer rcbos no longer have the fly lead.

 

[Jakegood]

Yeah, I removed the fly leads completely. I just missed putting the cpc from the disconnected ring final from the RCBO. Like I say the only thing I can think I didn’t do. Silly thing to miss and fail on. Get it the next time

 

[Baker1988]

Why would you disconnect the cpc any way that is not connected into the rcbo just take out the line and neutrals and remove fly leads and sorted i would say.

It is stated all cpc need to be connected when testing ir so dont remove any cpc at all

 

[Jakegood]

Silly mistake. Sort of thing you do under pressure I suppose?
I disconnected the ring to test it separately after I had done a global test on the board.