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EICR - main earth and neutral

Former Community Member
Former Community Member
Hi was conducting a EICR on a consumer unit today removed the cover and Main earth cable was 8 x single strand insulated cables istead of expected single 25mm also earth was the same??? it is in an apartment and has been running fine for

at least 20 years, just want to know what to input for csa?? and should I note it in observations under C3 CODE???? ANY ADVISE WELCOME THANKS
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    Sparkingchip:
    gkenyon:


    It's entirely possible (and perhaps more likely) that a line to neutral or line to earth fault will only short line to a single strand of the neutral or earth (or perhaps a few strands).

     



    A highly likely scenario is that a carpenter fires a nail from a nail gun into a concealed cable, it would almost certainly only contact two of the neutral conductors and the whole of the live conductor, bear in mind there’s possibly nineteen neutral conductors so that gives an effective neutral of say 2.6 mm.

     


    Agreed - and yes, it depends on the makeup as to the actual number and csa of the N conductors. Sounds like possibly 35 sq mm rather than the 25 sq mm example I ran through?


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  • 0
    Sparkingchip:
    gkenyon:


    It's entirely possible (and perhaps more likely) that a line to neutral or line to earth fault will only short line to a single strand of the neutral or earth (or perhaps a few strands).

     



    A highly likely scenario is that a carpenter fires a nail from a nail gun into a concealed cable, it would almost certainly only contact two of the neutral conductors and the whole of the live conductor, bear in mind there’s possibly nineteen neutral conductors so that gives an effective neutral of say 2.6 mm.

     


    Agreed - and yes, it depends on the makeup as to the actual number and csa of the N conductors. Sounds like possibly 35 sq mm rather than the 25 sq mm example I ran through?


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