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Bathroom Lights Tripping RCBO

Former Community Member
Former Community Member
Hi all. I have fully rewired my house, completed approx 5/6 weeks ago. Testing passed without fault. Last night the missus pulled the cord for the bathroom lights and apparently they all flashed on for a second and tripped the rcbo. (I have confirmed this) The 4 downlights are Aurora 5W ip65 fittings. Have since turned the fan iso off and remade switch but still tripped. Investigated the cables and their connections, no fault their either. Disconnected all the lights and wago’d off and no trip. At this point I turned the fan back on and whaddyaknow.. it tripped. 


seems as if their is a fault with the fan (opened it up and connection is okay so who knows) as well as the lights? Seems extremely unlikely to have blown together. I can not wrap my head around the issue. Please advise further!!
  • 0
    What else does this RCBO supply ?

    Does just adding any small load to that circuit trip it ? Try adding a test socket and something you know to be good.

    Can you tell if it is firing on an overload or the RCD part ?

    What test gear do you have to hand, can you ramp test the RCD or look at the standing earth leakage?


    and finally

    how are your N-E and LE voltages looking today ?

    (just in case the supply neutral has gone walk about.)


    Mike.
  • 0
    Seems extremely unlikely to have blown together.

    Not impossible - electronics are relatively easy to fry - so a single event (perhaps lightning, perhaps some other overvoltage) could plausibly damage several items of equipment at the same time.


    That's not to say there isn't a single fault present - a simple N-PE fault can cause an RCD trip when different combinations of (perfectly healthy) loads reach a certain threshold.


    Assume nothing!


      - Andy.
  • Former Community Member
    0 Former Community Member
    RCBO is a 6A Hager mini and only supplies the indoor lighting (bungalow, mostly led spots). Have tried loading with other lights and does not have any effect. 

    Not sure if overload or RCD, is there a secret way of checking at the rcbo that I don’t know about? ? didn’t have test gear on me so couldn’t check! (Only prove dead gear)
  • 0
    Not sure if overload or RCD, is there a secret way of checking at the rcbo that I don’t know about?

    Not secret, but some brands helpfully trip to a 'centre' position for the RCD or all the way for an MCB trip.

      - Andy.
  • 0
    The fan is presumably all insulated without an earth, so I would guess that there’s a live neutral shirt if that is tripping it.


    I had one blow up when I fitted and turned it on for the first time, it happens.
  • 0
    You could supply power to the fan, or the lights,  via temporary a plug and socket to test it, and see if it is actually working as expected.

    I presume there is nothing odd about the light switch even though that is the common part to both paths.


    mike

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