rcbo tripping times

[sparkygrant]

Hi all help please,I tested a6 amp rcbo30ma at board with out load connected the rcd results are 310ms at times 1 and 50ms at times5 so I changed it thinking it was faulty tested new 1I fitted got same results I then rcd tested another rcbo in the board another lighting circuit results are fine I then tuck the 1I tuck out because I thought it was faulty and put in my board at home and the results was fine has any one come across this before and can someone please help with this situation cheers

 

[Sintra]

You might get a better answer if you translated that into English.

 

[Plonker 3]

Did you carry out the tests with the load connected or disconnected?

Is you tester calibrated?

 

[Farmelectrics]

Is your tester in good working order

 

[Guest55]

^^^ see these questions answered and more in next weeks exciting episode folks , same time , same place.
;-)

 

[R G]

Fluorescent light fittings spring to mind , disconnect the loads and then test...

 

[Plonker 3]

We can but try biff, just a shame people don't hang round long enough to not learn anything.

 

[Octopus]

What make of RCBO is it? What BS number is it?

 

[GLENNSPARK]

Did you carry out the tests with the load connected or disconnected?

Is you tester calibrated?

he`s just told you Dillan

come on mate...lol..

 

[sparkygrant]

he`s just told you Dillan

come on mate...lol..

Sorry lads I fell to sleep hard day. But yeah meter is calibrated done Jan this year.but yeah tested it with and with out load connected getting same results.any ideas

 

[telectrix]

there's obviously something that is not common to the customer's install and your's. find that and you'll find the answer.

 

[Pete999]

Na I'm out I'm tucked up in bed

 

[sparkygrant]

Yeah sound mate thanks for that. What sort of un common thing am I looking for tho mate.have you come a cross this before

 

[mechelec]

Connection to earth ie Ze or Ra ?

 

[sparkygrant]

Thanks mate l I done zs all good results I'll check ze but imate proper done my head inis there any thing else it could be mate

 

[Richard Burns]

If there is some electrical equipment present that has a capacatative value that is connected across neutral to earth as may the case in some electronics, particularly on lighting then this can absorb some of the current generated by the tester and delay the switching of the RCBO.
Then again a very long length of cable can also have this effect but not normally at these levels.
You could try disconnecting the outgoing neutral or earth and seeing if that has an effect.
Try and get the RCBO as isolated as possible from all other influences.

 

[sparkygrant]

I will mate I have tried taking the out going live and neutral out and get the same results just never come across this before so any help much appreciated