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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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    no need to test L-N. maybe not even a good idea, if any of the things left plugged in contain electronics.


    I'd just do (L+N) to E - that is the one that picks up all likely RCD problems in one test, and then there is no need to disconnect loads. Also worth noting that if you are not to sure if you do have electronics connected, it is worth doing the test at a lower voltage than the full 500, at least  initially.

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    no need to test L-N. maybe not even a good idea, if any of the things left plugged in contain electronics.


    I'd just do (L+N) to E - that is the one that picks up all likely RCD problems in one test, and then there is no need to disconnect loads. Also worth noting that if you are not to sure if you do have electronics connected, it is worth doing the test at a lower voltage than the full 500, at least  initially.

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