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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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    AJJewsbury: 
     

    And mid route?

    514.3.2 “Every core of a cable shall be identifiable at its terminations AND PREFERABLY THROUGHOUT ITS LENGTH.” (Caps. mine)

    and…?

    Whenever you over-sleeve the ends you loose the ability to see the identification mid-route - where it be blue oversleeved brown on switch drops, black oversleeved G/Y in SWA, or G/Y oversleeved something else. As it's nigh-on impossible to get manufactured multi-core cables with just the core colours we want for every situation, something has to give - so it's only a preference in BS 7671 rather than a requirement. Nothing special for G/Y cores.

       - Andy.

    Except the  green/yellow  single core protective conductors mentioned in 514.4.2 which are given special mention and must not be oversleeved. I apply this principle to all green/yellow C.P.C.s. If we become slack about these things we will apply plumbers' rough working systems and wire tank thermostats in three core flex with the green/yellow being unsleeved and used as a live conductor. Not good.

     

    Also, many insulated conductors are not fully sleeved at the terminations, they just have a partial sleeve or a small tape flag. In this case it can be confusing. Or if the tape peels off the unknown green/yellow core may be a live conductor in reality. Not good as well.

     

    Z.

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  • 0

    AJJewsbury: 
     

    And mid route?

    514.3.2 “Every core of a cable shall be identifiable at its terminations AND PREFERABLY THROUGHOUT ITS LENGTH.” (Caps. mine)

    and…?

    Whenever you over-sleeve the ends you loose the ability to see the identification mid-route - where it be blue oversleeved brown on switch drops, black oversleeved G/Y in SWA, or G/Y oversleeved something else. As it's nigh-on impossible to get manufactured multi-core cables with just the core colours we want for every situation, something has to give - so it's only a preference in BS 7671 rather than a requirement. Nothing special for G/Y cores.

       - Andy.

    Except the  green/yellow  single core protective conductors mentioned in 514.4.2 which are given special mention and must not be oversleeved. I apply this principle to all green/yellow C.P.C.s. If we become slack about these things we will apply plumbers' rough working systems and wire tank thermostats in three core flex with the green/yellow being unsleeved and used as a live conductor. Not good.

     

    Also, many insulated conductors are not fully sleeved at the terminations, they just have a partial sleeve or a small tape flag. In this case it can be confusing. Or if the tape peels off the unknown green/yellow core may be a live conductor in reality. Not good as well.

     

    Z.

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