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EICR and IR Testing

Former Community Member
Former Community Member
Oh the bane of IR testing on EICRs

Now its just impracticle to disconnect all loads to carry out IR testing, I think everyone can agree on that. And that Phase and Neutral are connected then tested to earth.


This is what I do, and then test @250V as to avoid damaging any equipment in the installation. And unless the IR value was <.5 Meg, would not bother me. What BS7671 states, but BS7671 is maybe somewhat unclear in that if that voltage (250V) was used then .5meg value should used, but that value should only be used on SELV, and PELV. Now experience also tells me that even if you had a return 0.0, and then did Kohms by using the ohms setting, even values of 100Kohms are fine. (Actually can be much lower than this) and we are pretty clear that its not the cable reurning these values.


So question is when doing an EICR @ 250V, at what point would you recommend an FI? For me the value would have to be <.5Meg
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  • Former Community Member
    0 Former Community Member
    John Peckham:

    Sorry Chris but fairness has never been one of my weaknesses.


    IR often creeps up if the IR test button is held down especially if the installation is large as with a good IR the installation acts like a capacitor with the DC from instrument charging the capacitor. 


    I would never IR test L/L on a periodic as you can never be sure everything electronic has been disconnected and I am not keen on a claim on my insurance.


    When doing periodic, and doing IR Testing L-N to E Im happy with 4 meg, and will note that on the test as global test. Just dont have the time or to start stripping the install down, and then, well actually nothing as everything is mnow above 200Meg


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  • Former Community Member
    0 Former Community Member
    John Peckham:

    Sorry Chris but fairness has never been one of my weaknesses.


    IR often creeps up if the IR test button is held down especially if the installation is large as with a good IR the installation acts like a capacitor with the DC from instrument charging the capacitor. 


    I would never IR test L/L on a periodic as you can never be sure everything electronic has been disconnected and I am not keen on a claim on my insurance.


    When doing periodic, and doing IR Testing L-N to E Im happy with 4 meg, and will note that on the test as global test. Just dont have the time or to start stripping the install down, and then, well actually nothing as everything is mnow above 200Meg


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