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Recommended checks before CU change

Former Community Member
Former Community Member
As most of you know I’ve only been qualified for just over a year and I’ve got a quote to do for a cu upgrade.


I know I’m nowhere experienced enough to do EICR’s yet, but what would you guys recommend I check/test before doing the cu upgrade and should I do these checks/tests at the quote stage?
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  • Former Community Member
    0 Former Community Member

    sparkiemike:

    Pre Quote checks as these could have an impact on your price



    • Earthing Arrangements incl
      • Earthing Conductor

    • ZeDB

    • Bonding conductors


    • Meter tails and equipment

    • Polarity at DB


    You don't have to do a full ECIR, but you should be able to do the tests required for initial verification to ensure that the new CU is going to do the job. Whether you do this before are after the CU is changed is a matter of personal preference, I prefer to do it before.


    This would include 
    • Continuity of protective conductors

    • Ring final circuit conductors continuity

    • Insulation Resistance

    • SELV, PELV or by electrical protection

    • Polarity

    • Earth electrode resistance

    • Impedence, (Zs & Ze) & Pfc

    • Functional testing & RCDs

     




    Thanks SparkieMike


    The first part above makes sense, but the second part regards initial tests, are these done before I quote or do I factor in an hour on the quote to do them on the day when I turn up to do the cu change? 


    This is my first ever cu change quote, so want to get it right.

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  • Former Community Member
    0 Former Community Member

    sparkiemike:

    Pre Quote checks as these could have an impact on your price



    • Earthing Arrangements incl
      • Earthing Conductor

    • ZeDB

    • Bonding conductors


    • Meter tails and equipment

    • Polarity at DB


    You don't have to do a full ECIR, but you should be able to do the tests required for initial verification to ensure that the new CU is going to do the job. Whether you do this before are after the CU is changed is a matter of personal preference, I prefer to do it before.


    This would include 
    • Continuity of protective conductors

    • Ring final circuit conductors continuity

    • Insulation Resistance

    • SELV, PELV or by electrical protection

    • Polarity

    • Earth electrode resistance

    • Impedence, (Zs & Ze) & Pfc

    • Functional testing & RCDs

     




    Thanks SparkieMike


    The first part above makes sense, but the second part regards initial tests, are these done before I quote or do I factor in an hour on the quote to do them on the day when I turn up to do the cu change? 


    This is my first ever cu change quote, so want to get it right.

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