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Additional connection to earth 411.4.2

Simon Mitchell

Hi,

Regulation 411.4.2 regarding TN systems now includes a recommendation to install an additional connection to earth using an earth electrode. There is no indication within the regs why you would or wouldn't fit one. The guidance on language on p18 of the regs equates "recommendation" to "should". Therefore we should install an earth electrode to all TN-S and TN-C-S systems.

I can't find any discussion on this when searching but it seems quite a big change to previous regs. Should we be installing earth rods as a standard?

Simon

  • 0

    "I can't find any discussion on this when searching but it seems quite a big change to previous regs. Should we be installing earth rods as a standard?"

    That is because the relevant discussions are on the old forums the IET have closed down, because they are deemed too be no longer relevant and topical.

  • 0

    If nothing has changed with regard to TN systems in general,

    In the DPC the concern seemed to be breaks in the supple PEN conductor - in the old days metal water and gas supply pipes provided a half decent alternative, via main bonding. These days of plastic mains they no longer provide that reassurance.

       - Andy.

  • 0 in reply to AJJewsbury

    Agreed, but it wasn't just the low resistance of the gas service pipe and the main in the street to the general mass of the Earth. If the loss of the PEN was at the joint between the main and my service cable, the current would go back to the transformer via my bonding, the gas pipes to next door, their bonding back to the service head and then back through the PEN in their service cable, etc.

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