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13A EV socket

lyledunn
TNCS system in local development. Second hand BMW 330E Hybrid with ICCB that appears to restrict charging to 6A. Owner wants 13A socket on outside wall of house. 

The area is near the Mourne mountains where an Ra of 200 ohms would be difficult to achieve with a single rod. In any event the driveway has just be nicely finished. It would be a simple matter of drilling through the back of the meter cupboard to provide  the 13A socket but it is the loss of neutral protection that is the problem. Anyone know if loss of neutral protection is available as a separate item?
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    mapj1:

    If the advice only covers the case of the broken PEN just outside your own property it is missing a whole slew of more likely fault cases (there being probably one PEN joint that can fail to isolate only one property, and a multitude of joints that can fail in  way that isolates more than one.).

    I agree any attempt to use electrodes to hold the neutral down close to ground potential on both sides of a break in a current carrying circuit is pretty much futile.

    Hence bosky bonds to plumbing and advice to TT to the local surface potential if it really matters.



     


    Agreed on the "only covering PEN outside your property". However, if we're talking about a dwelling, using the full maximum demand perhaps errs on the side of caution by a good way. In addition, in a three-phase installation, the electrode resistance depends not only on the demand downstream of the PEN break, but also on the phase imbalance ...


    With respect to "TT the local surface potential", the local surface potential drops off quite rapidly, perhaps even the difference between one side of a parked vehicle and the other ... forget about it's length ... and you've no idea where buried metalwork connected to PME is located ...


    Shock risk is reduced if you're on certain surfaces (e.g. paved/tarmac) but not dependable (weather, ground saturation conditions, etc.)


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  • 0
    mapj1:

    If the advice only covers the case of the broken PEN just outside your own property it is missing a whole slew of more likely fault cases (there being probably one PEN joint that can fail to isolate only one property, and a multitude of joints that can fail in  way that isolates more than one.).

    I agree any attempt to use electrodes to hold the neutral down close to ground potential on both sides of a break in a current carrying circuit is pretty much futile.

    Hence bosky bonds to plumbing and advice to TT to the local surface potential if it really matters.



     


    Agreed on the "only covering PEN outside your property". However, if we're talking about a dwelling, using the full maximum demand perhaps errs on the side of caution by a good way. In addition, in a three-phase installation, the electrode resistance depends not only on the demand downstream of the PEN break, but also on the phase imbalance ...


    With respect to "TT the local surface potential", the local surface potential drops off quite rapidly, perhaps even the difference between one side of a parked vehicle and the other ... forget about it's length ... and you've no idea where buried metalwork connected to PME is located ...


    Shock risk is reduced if you're on certain surfaces (e.g. paved/tarmac) but not dependable (weather, ground saturation conditions, etc.)


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