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Discuss Fitting a 100ma RCD on Solar PV to solve nuisance tripping. in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. South Spark
    Offline

    South Spark Regular EF Member

    Location:
    South East
    A solar PV system keeps tripping the 30ma B curve RCD (at dawn).

    The system is a TNC-S and the cabling to the inverter is surface mounted SWA.

    Is there any reason to not swap the 30ma main switch out for a 100ma ?
     
  2. Wilko
    Online

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Sorry to ask a dumb question - B curve RCD ?
     
    • Agree Agree x 2
  3. Dillb
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    Dillb Electrician's Arms

    Location:
    Nottingham
    Does the cable require RCD protection?
     
    • Like Like x 2
  4. davesparks
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    davesparks Forum Mentor

    Location:
    guildford
    If the circuit requires 30mA RCD protection then no you cannot remove it.
     
    • Agree Agree x 2
  5. GeorgeCooke
    Offline

    GeorgeCooke Regular EF Member

    Location:
    UK
    Find the fault, don't mask it.

    If the oil pressure light comes on in your car would you remove the bulb?
     
    • Agree Agree x 3
    • Funny Funny x 2
  6. marconi
    Offline

    marconi Respected Member

    Do you mean:
    a. RCD/RCCB
    b. MCB
    or
    c. RCBO

    is tripping?
     
    • Funny Funny x 2
  7. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    I think he means the upfront RCD for all the circuits.

    In this case no✋
     
  8. netblindpaul
    Offline

    netblindpaul Forum Mentor

    Location:
    South Wales
    He probably means a B type RCD.
    So it’s only tripping when the DC cables polarise at the start of generation?
     
    • Informative Informative x 1
    • Optimistic Optimistic x 1
  9. JD6400
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    JD6400 Forum Mentor

    Location:
    ?
    Hi South spark , what size system is it , make of inverters and is it domestic or commercial ?
     
  10. South Spark
    Offline

    South Spark Regular EF Member

    Location:
    South East
  11. South Spark
    Offline

    South Spark Regular EF Member

    Location:
    South East
    B type sorry.
     
    • Like Like x 1
  12. South Spark
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    South Spark Regular EF Member

    Location:
    South East
    3.6 kw- domestic. Sunny Boy I think. Solar installation isn't mine. Isolated farm so a bit of a faff to be going to and fro.
     
  13. South Spark
    Offline

    South Spark Regular EF Member

    Location:
    South East
    Seems so from customer reports. He's been resetting the RCD and the system is working fine after that. Of course dawn is around 5.15 at the moment so he's missing out on a lot of FIT.
     
  14. Wilko
    Online

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Ha ha - he should get a cat, or an infant :) .
     
    • Funny Funny x 2
  15. marconi
    Offline

    marconi Respected Member

    Would you know if the Sunny Boy is:

    a. transformerless?
    b. is disconnected from the SWA cable until PV generation starts?

    One thing to look at (from netblindpaul#8) is how tightly have the dc cables been clamped around their insulation to any metalwork.

    If there is more than one Sunny Boy (I expect so) can you disconnect one in turn and leave the others on-line to see if the problems goes away?
     
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