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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?

Parents
  • 0

    KevinF: 
     

    Thanks all - some upda I have identified what appears to be the earthing conductor as it disappears into a wall, and doing a Ze at the board with all of the other bonding disconnected from the MET I get a reading of 8.6ohms. This is not too far away from my own properties readings.

     

     

     

    So hopefully all of the final circuits are protected by 30mA R.C.D.s then, especially the 16 Amp circuits and above. But wait, you say that the installation is TT earthed. So where is the earth electrode? It needs to be found. It should be visible for inspection and testing. You can't rely upon the public metal water and gas pipes as an earth electrode. 542.2.6. as Chris said earlier.

     

    Where does the earthing conductor connect to?

    Where is the main earth terminal?

    What earthing arrangement is present?

     

    We need to know.

     

    Z.

Reply
  • 0

    KevinF: 
     

    Thanks all - some upda I have identified what appears to be the earthing conductor as it disappears into a wall, and doing a Ze at the board with all of the other bonding disconnected from the MET I get a reading of 8.6ohms. This is not too far away from my own properties readings.

     

     

     

    So hopefully all of the final circuits are protected by 30mA R.C.D.s then, especially the 16 Amp circuits and above. But wait, you say that the installation is TT earthed. So where is the earth electrode? It needs to be found. It should be visible for inspection and testing. You can't rely upon the public metal water and gas pipes as an earth electrode. 542.2.6. as Chris said earlier.

     

    Where does the earthing conductor connect to?

    Where is the main earth terminal?

    What earthing arrangement is present?

     

    We need to know.

     

    Z.

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