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Discuss Is this RCD underrated? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Dave Robinson
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    Dave Robinson EF Member

    Location:
    Scarborough
    Looking to add two circuits for a workshop & an outside socket, but in looking at my CU there are four MCBs; (one 32A ring, two showers 40 & 45 and 32 cooker) into an 80A 30mA RCD. I appreciate the likelihood of running both showers, oven, washing machine and tumble drier simultaneously is unlikley, but is this common practice?
    We have experienced it tripping when all appliances are on & our two boys are growing=increasingly showering! - probably only going to get worse.
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    you need a bigger CU.
     
  3. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Diversity Rules OK
     
    • Like Like x 1
  4. anthonybragg
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    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    Is this RCD the main switch?
     
    • Like Like x 1
  5. DAvid Prosser
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    DAvid Prosser Electrician's Arms

    Location:
    UK
    Heung-Min Son, now he's underrated !
     
    • Funny Funny x 1
  6. rapparee
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    rapparee Electrician's Arms

    Location:
    Ireland
    An Olympic diver
     
  7. Dave Robinson
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    Dave Robinson EF Member

    Location:
    Scarborough
    No, main 100A switch and two 6A non-RCD'd MCB for lights/smoke alarm upstream.
     
  8. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi Dave and Welcome to the Forum :)
    I wouldn't install 2 showers on one RCD. If they ever go on together that will be close to full capacity and a toaster and kettle will see you OTT.
     
    • Like Like x 1
  9. Dave Robinson
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    Dave Robinson EF Member

    Location:
    Scarborough
    Well, yes, it didn't seem right, but someone disagrees with both of us and has done! Install was before we moved in.
    Resolve with an independent 45A RCBO for each shower straight after the main switch, or anyone have a better idea?
     
  10. Baddegg
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    Baddegg Still simmering Ken, not boiled yet buddy x Electrician's Arms

    Location:
    Portsmouth
    Rcbos better option on non rcd side Dave...
     
  11. Flanders
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    Flanders Regular EF Member

    Location:
    Tamworth
    As above your set up is not ideal .If its an RCD and not and RCBO then that would only trip if there where a fault as in to much earth leakage, it will not trip out if overloaded
     
  12. DefyG
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    DefyG Regular EF Member

    Location:
    South East
    Just move one over onto a RCBO and save the cost of a second RCBO!

    Long term would be better with independent RCBO's as potential problems would not affect other circuits.
     
    • Agree Agree x 1
  13. Flanders
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    Flanders Regular EF Member

    Location:
    Tamworth
    What power are you looking to add to work shop? As others have said you could just add rcbos for your addional circuits, depends on the make of you board though as some rcbos may cost the same a new consumer unit
     
    • Agree Agree x 1
  14. Dave Robinson
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    Dave Robinson EF Member

    Location:
    Scarborough
    Sounds like a plan, thanks all!
     
  15. Dave Robinson
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    Dave Robinson EF Member

    Location:
    Scarborough
    For the workshop, I think I'm going to run an independent master breaker from the main fuse in the house, then SWA out to the workshop and an independent CU in there.
     
    • Agree Agree x 1

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