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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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    If you had a TN-S system back to the substation, you could look at the balance of phase and neutral currents and detect faults down stream in an RCD (or earth fault relay) style.

    In this strange parallel universe, you'd want each house to be equipped with an RCD at the incomer to remove any from the network that would lead to tripping of the LV network RCD.


    With a PME LV network you cannot tell fault current to earth from neutral current, so such protection is impossible. Oddly this was first brought home to me in the generator yard at Agrekko near Milton Keynes, when the chap showing us what they had, explained to us all that a special key switch for earth fault detection disable, was fitted to all the gensets they may be called upon to provide to the local DNO, so they could feed in at a faulty substation, in to a network with in effect the biggest NE short going.

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    If you had a TN-S system back to the substation, you could look at the balance of phase and neutral currents and detect faults down stream in an RCD (or earth fault relay) style.

    In this strange parallel universe, you'd want each house to be equipped with an RCD at the incomer to remove any from the network that would lead to tripping of the LV network RCD.


    With a PME LV network you cannot tell fault current to earth from neutral current, so such protection is impossible. Oddly this was first brought home to me in the generator yard at Agrekko near Milton Keynes, when the chap showing us what they had, explained to us all that a special key switch for earth fault detection disable, was fitted to all the gensets they may be called upon to provide to the local DNO, so they could feed in at a faulty substation, in to a network with in effect the biggest NE short going.

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