Need help on testing procedures & fault finding

[Chaza]

Failed am2 on ring final circuit, insulation resistance testing & fault finding..

 

[Brightspark2]

Do you have guidance note 3?...or the on site guide?...


It explains testing procedures in there, with pictures, may be easier to understand than me or whoever explaining...

 

[trev]

Unlucky mate, does it tell you any more info on why these tests failed you?

 

[SirKit Breaker]

Failed am2 on ring final circuit, insulation resistance testing & fault finding..

Unlucky fella, but try and explain a bit more of what you don't understand, and you will get all the help you need.
If you have done the AM2, then you cant be too far away.

Cheers..........Howard

 

[telectrix]

as above, be more specific, please.

 

[Chaza]

The results only showed what I failed on but not why. trying to get in routine when testing but it's probably my nerves that let me down, I may have missed a test on my rfc but I just can't think back to what I done.. Cheers for input..

 

[trev]

So tell us what you did, not what you should have done, and we can point out what you missed. It's a harsh lesson but I'll bet you won't repeat it mate

 

[Chaza]

I tested end to end on all conductors in the ring and then tested at each socket outlet and recorded my results.
Insulation resistance I tested each circuit line-neutral then line to c.p.c, removing all vulnerable equipment beforehand...

 

[telectrix]

did you IR test N-E?

 

[trev]

RFC testing, continuity readings for L N CPC all 3 readings being recorded.
Cross connect L + N then test at each outlet
Cross connect L + CPC then test at each outlet, the highest reading = (R1+R2)
These steps prove continuity and polarity
IR test = L/N, L/CPC, N/CPC with all vunerable equipment removed, if this cannot be done link L&N and test between these and CPC
It's all in GN3 mate, like I said it's a harsh lesson but you'll get it next time

 

[Flakey]

Did you cross connect L-cpc etc?

 

[telectrix]

Cross connect L + N then test at each outlet


is this one necessary, trev?

 

[trev]

By the book yes mate and as it was for his AM2, i thought it best to do it

 

[telectrix]

yes, it would show up a poor N connection into the S/O. agree.

 

[Chaza]

Cheers all it was my cross connection on the rfc test I didn't do, and n-cpc on ir test got re-sit 20th April will post next results