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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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    lyledunn:
    Harry Macdonald:

    "With a PME LV network you cannot tell fault current to earth from neutral current,"

    This is generally true but surely, at the PEN to earth connection at the substation you can. If there is a PEN break, then the entire load current of the properties beyond the break must return via earth, the exact amount depending on how good the earth is at the property. Some of this will find its way back into the PEN conductor at other properties but much of it will travel through earth until it arrives at the transformer earth.

    It should not be beyond a protection engineer to set the level at above the allowable general leakage and below that which would detect a PEN break.


    That would require an electrode downstream of all possible open PEN conditions. 




    And ignores the effect of extraneous-conductive-parts, which can mask broken PEN conditions by diverting neutral currents via the MET of installations upstream of the break through shared metallic service pipes, or, if extensive and soil resistivity is very low, provide an alternative return path


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  • 0
    lyledunn:
    Harry Macdonald:

    "With a PME LV network you cannot tell fault current to earth from neutral current,"

    This is generally true but surely, at the PEN to earth connection at the substation you can. If there is a PEN break, then the entire load current of the properties beyond the break must return via earth, the exact amount depending on how good the earth is at the property. Some of this will find its way back into the PEN conductor at other properties but much of it will travel through earth until it arrives at the transformer earth.

    It should not be beyond a protection engineer to set the level at above the allowable general leakage and below that which would detect a PEN break.


    That would require an electrode downstream of all possible open PEN conditions. 




    And ignores the effect of extraneous-conductive-parts, which can mask broken PEN conditions by diverting neutral currents via the MET of installations upstream of the break through shared metallic service pipes, or, if extensive and soil resistivity is very low, provide an alternative return path


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