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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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    leesrubberroom2: 
    You can't have a PME'd TT system. You need to trace the main earth from the CU, and see if it goes to the incomer from the DNO, or if it goes off somewhere else. By looking at the service head, you'll see if there is an incoming earth which comes from a separate sheath (TNCS, in which case assume PME as this could be the case now or in the future) or from the neutral inside the service head. You can see some examples here in our EV's and earth rods video https://youtu.be/M51_BX1_4XI which i hope helps.

    In that video link did I see an earth clamp with a red label used outside?

    Z.

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  • 0

    leesrubberroom2: 
    You can't have a PME'd TT system. You need to trace the main earth from the CU, and see if it goes to the incomer from the DNO, or if it goes off somewhere else. By looking at the service head, you'll see if there is an incoming earth which comes from a separate sheath (TNCS, in which case assume PME as this could be the case now or in the future) or from the neutral inside the service head. You can see some examples here in our EV's and earth rods video https://youtu.be/M51_BX1_4XI which i hope helps.

    In that video link did I see an earth clamp with a red label used outside?

    Z.

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