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Marcus Vaughan

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Crabtree RCCB not tripping -help! upload_2019-2-18_9-6-34 - EletriciansForums.net

Hi all.

So the Crabtree old style in my hand failed the I delta n test (times 1). But passed the 5 times test.

So I have replaced it with the one in the board. Supposedly reconditioned - and that’s failing both tests but mechanical works.

I am wondering if I am missing something here with my testing.

I am testing through a socket outlet.

Anyone any ideas other than replace with new?
 
Have you checked for N-E faults? These can interfere with both MFT tests and the operation of the test button.
 
Have you checked for N-E faults? These can interfere with both MFT tests and the operation of the test button.

I’ve not tested all those protected circuits no. Just the one I have been working on.

I think I’ll swap out with another RCCB before tackling that one - off to pick one up now.
 
Hi Marcus - a couple of things, apologies if you've already done these :) .
Test with nothing on the outgoing side of RCD.
Confirm tester set to AC and batteries are good.
Target for 1 times with BS4293 is 200ms.
If the RCD is needed for additional protection as per Reg 531.3.6 it turns out that BS4293 devices aren't mentioned on the list anymore. But guidance below states as long as 5 times meets 40ms then it's ok to continue to use the BS4293 device.
http://www.elecsa.co.uk/Documents/Contractor-Documents/Pocket-Guides/Pocket-Guide-25.aspx
 
Thanks Wilco.

I certainly considered not swapping out the original - seeing as it passed the 5 times test - as as you say - is only for additional protection.

I’ve just swapped it out again - and it’s now working.

But - when I tested at the socket outlet - no joy - but tested at the board (to be honest) - and it’s fine.

I’d like to get my head round what’s gone on here.

Best get back to work.....
 
Hi Marcus - a couple of things, apologies if you've already done these :) .
Test with nothing on the outgoing side of RCD.
Confirm tester set to AC and batteries are good.
Target for 1 times with BS4293 is 200ms.
If the RCD is needed for additional protection as per Reg 531.3.6 it turns out that BS4293 devices aren't mentioned on the list anymore. But guidance below states as long as 5 times meets 40ms then it's ok to continue to use the BS4293 device.
http://www.elecsa.co.uk/Documents/Contractor-Documents/Pocket-Guides/Pocket-Guide-25.aspx
That handbook is out of date now.
 

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