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Site cabin EICR

Paul Brewerton
Hi folks,


We have a site welfare cabin that needs an EICR. The cabin is powered by an onboard generator, which is connected to an earth electrode.

What is lowest acceptable resistance we are looking for when conducting an earth electrode test.


Thanks for any advice you can give, I have gone through BS7671 and IET GN3 and cant find the answer..


Paul


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    Paul Brewerton:

    Thanks chaps for all your input. I've got the answer I need now.

    OSG 2.4.3  <200 ohms




    If the generator is up to 10 kVA, and all circuits that may supply equipment external to the unit are protected by a 30 mA RCD, then it's 200 Ohms.


    If one or more circuits have RCD with a greater residual current rating than 100 mA may be used to power anything external to the unit, then I would be inclined to reduce the value to permit that RCD to operate for a fault to "Earth" outside the unit, in line with Table 41.5. (This is the approach in Section 9 of the IET Code of Practice for Electrical Energy Storage Systems, for systems operating in island-mode.)



    Finally ... an earth electrode may not be required at all, if nothing external to the unit is to be powered.


    HOWEVER, it is ESSENTIAL if anything external to the unit is to be supplied, even a single extension lead.

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  • 0

    Paul Brewerton:

    Thanks chaps for all your input. I've got the answer I need now.

    OSG 2.4.3  <200 ohms




    If the generator is up to 10 kVA, and all circuits that may supply equipment external to the unit are protected by a 30 mA RCD, then it's 200 Ohms.


    If one or more circuits have RCD with a greater residual current rating than 100 mA may be used to power anything external to the unit, then I would be inclined to reduce the value to permit that RCD to operate for a fault to "Earth" outside the unit, in line with Table 41.5. (This is the approach in Section 9 of the IET Code of Practice for Electrical Energy Storage Systems, for systems operating in island-mode.)



    Finally ... an earth electrode may not be required at all, if nothing external to the unit is to be powered.


    HOWEVER, it is ESSENTIAL if anything external to the unit is to be supplied, even a single extension lead.

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