New LED Downlight on Relay trips RCD

Discussion in 'C-Bus Wired Hardware' started by CM1, Feb 18, 2019.

  1. CM1

    CM1

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    I am replacing a single 50W quartz halogen downlight running from a L5512 Relay. One switch one light.

    The new trailing edge 12W driver and LED works fine on a L5508 Dimmer (although it doesn't dim right down and the driver may have a shorter life because the dimmer is leading edge) however it trips the 10amp RCD with the relay unit. I have checked voltage and polarity on the downlight. I have checked that the new LED works from a GPO. I have put a 7W 240v LED onto the downlight wire and it works OK.

    Any suggestions as to why the RCD keeps tripping?
     
    CM1, Feb 18, 2019
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  2. CM1

    Wonkey

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    I would check that the neutral and active are both feed via the same rcd.
    I presume its a rcbo given the fact its 10amp rated.
     
    Wonkey, Feb 18, 2019
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  3. CM1

    CM1

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    Good point Wonkey. I had taken that for granted beause a 7w 240v LED was already working on that wire. When I checked, it was on a different RCD to the earth. Now reconnected and software updated - all OK. Many thanks for your help.

    That raises the question as to what load triggers the RCD?
     
    CM1, Feb 20, 2019
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  4. CM1

    Wonkey

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    Typically 30mA is the out of balance current needed to trip
    Which is damn close to 7watts at 230v
     
    Wonkey, Feb 20, 2019
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