rcbo keeps tripping on lighting circuit

[intecsec]

Hi I've just replaced a mem 6amp mcb on a lighting circuit with a 6 amp type B 30 ma rcbo of similar make to add in outside lights. but problem is that when one set of lights on that circuit keep tripping rcbo. has anyone any ideas. Thanks

 

[EFLImpudence]

What do you mean by 'one set of lights'?

Do other lights on the same circuit NOT trip the rcbo?

 

[Taylortwocities]

And why do you need and RCBO on that circuit?

 

[Iggifer]

is it the hall / landing light that trips the RCBO?

 

[securespark]

IME, if it was a borrowed neutral, you'd get two devices tripping.

 

[ban-all-sheds]

Not if only one of them was an RCBO and the other was an MCB not on an RCD.

 

[ricicle]

Not if only one of them was an RCBO and the other was an MCB not on an RCD.

No, but either circuit should trip the one RCBO when a light is switched on.

 

[ban-all-sheds]

Indeed.

Maybe it's one set of outdoor lights that he's just added which is causing the trip.

 

[ban-all-sheds]

Hi I've just replaced a mem 6amp mcb on a lighting circuit with a 6 amp type B 30 ma rcbo of similar make to add in outside lights. but problem is that when one set of lights on that circuit keep tripping rcbo. has anyone any ideas. Thanks

What tests did you do on these new additions before and after energising them?

 

[rjm2k]

Did you test as you went along or just do it all in one go?

Fairly obvious thing to do is follow a process of elimination, reverse your changes one at a time until it works again then work out what's wrong.

Ie remove the new lights, does it all work now?

If not undo your next change, maybe that was the RCBO, does it work now?