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EV install on a TT system - DNO PME?

Former Community Member
Former Community Member

Hi, new to this forum.

These might be obvious questions but I can't find an answer to it. 

Background.

A domestic house has a TT supply, has had a CU changed in 2019 but the new owners have no paperwork.

I can find no evidence of an earth rod anywhere and all the bonding cables go to the gas/water supplies. I did a quick Zs at the board = 2.9ohms. 

How do I know if the installation has been PME'd on the pole? (overhead wires)

Second part is - they want an EV charger installed that they brought with them from their old house. It will require TT, but as this property is TT it shouldn't need to have a separate rod.

If the installation is  a PME'd TT I would assume I would need to TT the EV?

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    How do I know if the installation has been PME'd on the pole? (overhead wires)

     

    Clues: Notices affixed to the poles. Earth rods installed at the base of poles, especially at the last one in a run of poles.

    Your installation earth rod may be buried under stuff and not be visible. Your Ze is very low for just a rod. Around here I get about 100 to 200 Ohms for a rod resistance.

    Loop tests on P.M.E. earthed installations normally show a figure of 0.35 Ohms max. at the main earth terminal.

    As Chris says, put in an official request to the distributor for the info. via the home owners if necessary. An application for a P.M.E. supply starts with the distributor surveying the install to confirm the possibility. Around here a  new P.M.E. earth terminal is installed at no cost.

     

    Z.

Reply
  • 0

     

    How do I know if the installation has been PME'd on the pole? (overhead wires)

     

    Clues: Notices affixed to the poles. Earth rods installed at the base of poles, especially at the last one in a run of poles.

    Your installation earth rod may be buried under stuff and not be visible. Your Ze is very low for just a rod. Around here I get about 100 to 200 Ohms for a rod resistance.

    Loop tests on P.M.E. earthed installations normally show a figure of 0.35 Ohms max. at the main earth terminal.

    As Chris says, put in an official request to the distributor for the info. via the home owners if necessary. An application for a P.M.E. supply starts with the distributor surveying the install to confirm the possibility. Around here a  new P.M.E. earth terminal is installed at no cost.

     

    Z.

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