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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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    I was thinking of 514.4.2 Mr. J.

    That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

       - Andy.

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  • 0

    I was thinking of 514.4.2 Mr. J.

    That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

       - Andy.

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