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DNO cable

Kelly Marie Angel

Hi just a quick question I used to know this but now can't remember if the old PILC cable joined to a PVC covered cable as a replacement for a faulted section  how do they keep the earth impedance down? Especially if the PILC length is now a lot less than it was supply's in properties along the road are a mix of TNS and CNE  Thanks

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    depends what you mean by the earth impedance -

    The electrode impedance between the cpc and the terra-firma is raised by the loss of exposed lead surface, but usually earth rods or tapes are buried in the pit beside the joint as you would on a PME type set-up

    If you meant the Zs loop impedance back to the transformer, the jacket of the PILC is interrupted but as per the previous answers bonded via the neutral on both sides of the new section Mike

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    depends what you mean by the earth impedance -

    The electrode impedance between the cpc and the terra-firma is raised by the loss of exposed lead surface, but usually earth rods or tapes are buried in the pit beside the joint as you would on a PME type set-up

    If you meant the Zs loop impedance back to the transformer, the jacket of the PILC is interrupted but as per the previous answers bonded via the neutral on both sides of the new section Mike

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