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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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    Fitzy71:

    When these boards were installed, would the neutrals be in the same numerical order as the fuses are laid out, or was it just hit & miss in those days?




    The neutrals should be in the correct order relating to the lives, BUT very often are not. If the whole T&E cable can be seen than identification is easy, but if just singles appear that can create i/d problems. The different cable sizes can also help to identify likely suspects. I have been known to turn off and double check disconnection, lock off and temporarily connect a 9 Volt smoke alarm battery to a circuit and test at the consumer unit with a Volt meter to identify cables. All loads must be disconnected of course or they will just short out the battery.


    Z.

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  • 0

    Fitzy71:

    When these boards were installed, would the neutrals be in the same numerical order as the fuses are laid out, or was it just hit & miss in those days?




    The neutrals should be in the correct order relating to the lives, BUT very often are not. If the whole T&E cable can be seen than identification is easy, but if just singles appear that can create i/d problems. The different cable sizes can also help to identify likely suspects. I have been known to turn off and double check disconnection, lock off and temporarily connect a 9 Volt smoke alarm battery to a circuit and test at the consumer unit with a Volt meter to identify cables. All loads must be disconnected of course or they will just short out the battery.


    Z.

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