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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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    BNO network has to comply with BS 7671 which is why split concentric cables are used as concentric cables with a combined neutral and earth cannot be used.

    Why can't a CNE be used in a BS 7671 installation? BS 7671 doesn't seem to prohibit it - indeed section 543.4 seems to specifically list the requirements for CNE conductors. Since the demise of the old Electricity Supply regs I'm not aware of any need to obtain authorization from anyone any more. The ESQCR prohibits CNEs in consumer's installations - but then a building network isn't a consumer's installation.


    Granted CNEs can cause all sorts of issues you'd ideally not want within a building these days, so I doubt that anyone would want to use them for a new install - but if you're producing an EICR for an exiting CNE BN against BS 7671 the difference could be quite significant.


       - Andy.
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    BNO network has to comply with BS 7671 which is why split concentric cables are used as concentric cables with a combined neutral and earth cannot be used.

    Why can't a CNE be used in a BS 7671 installation? BS 7671 doesn't seem to prohibit it - indeed section 543.4 seems to specifically list the requirements for CNE conductors. Since the demise of the old Electricity Supply regs I'm not aware of any need to obtain authorization from anyone any more. The ESQCR prohibits CNEs in consumer's installations - but then a building network isn't a consumer's installation.


    Granted CNEs can cause all sorts of issues you'd ideally not want within a building these days, so I doubt that anyone would want to use them for a new install - but if you're producing an EICR for an exiting CNE BN against BS 7671 the difference could be quite significant.


       - Andy.
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