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  1. Adam byrne
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    Adam byrne EF Member

    Location:
    St Albans
    So for college I'm having to fill out a job form and answer questions on a job I've done, for this form it's TESTING.

    As I'm a lowly data apprentice Doing an electrical apprenticeship I'm not too sure on some things

    So the fault I've decided to write about is one time where I had a full lighting panel (control4) with 8 control packs with 8 circuits each, each pack had it's own 6a mcb and were all on a single 32a RCD, whenever you flicked the rcd it tripped instantly, now I know this is due to the small amount of earth leakage each pack and quickly we changed to RCBOs , the only thing is the question asks "What tests did you perform" and I'm stumped, I can just say "I just knew it was earth leakage"

    I would appreciate any help
     
  2. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Use an earth leakage clamp meter on the cpcs of each circuit, to total the cumulative earth leakage
     
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  3. Adam byrne
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    Adam byrne EF Member

    Location:
    St Albans
    Cheers mate this helped a lot, also to resolve this surely it's as simple as switching to RCBOs?
     
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  4. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Yes swapping the CBs for RCBOs will do as you say swap the Main RCD to a main switch, will stop the cumulative effect of all the earth leakages.
     
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  5. Adam byrne
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    Adam byrne EF Member

    Location:
    St Albans
    And what legal tests do I have to do after
    Question states "when the fault was corrected what did you do"
     
  6. ruston
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    ruston Respected Member

    Location:
    Northumberland
    Fill out relevant test forms for the circuits altered.
     
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  7. Adam byrne
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    Adam byrne EF Member

    Location:
    St Albans
    Would that be a minor works?
     
  8. ruston
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    ruston Respected Member

    Location:
    Northumberland
    If you have altered the board and 8 circuits I would be inclined to issue an EIC .
     
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  9. Adam byrne
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    Adam byrne EF Member

    Location:
    St Albans
    I think I've got it all, appreciate the help from both of you just made 8 hours at a desk into 3 max
     
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  10. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Agreed with Ruston, but the Regulations only require a MNWC for circuit alterations.
     
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  11. ruston
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    ruston Respected Member

    Location:
    Northumberland
    @Pete999@Pete999 I agree, but depends on what he has done . And by the time he fills those forms and tested the circuits it would be as prudent to issue an EIC in my opinion .
    Edit . Last paragraph.
     
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    Last edited: Nov 28, 2018
  12. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Like I said Ruston I agree with your answer,just making the OP aware of what 7671 says about circuit alterations, swapping all those CBs for RCBOs is more. than Minor works, as it's a college type exorcise you never know what the examination body requires.
     
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  13. Baddegg
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    Baddegg Still simmering Ken, not boiled yet buddy x Electrician's Arms

    Location:
    Portsmouth
    If you changed the mcb to rcbo wouldn’t you test the rcbo times?
     
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