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Reducing cable sizes for termination agasint volt drop

MS01
Hopefully a straight forward question:- I have a development where the submains supply is 70mm² XLPE/SWA/LSF  and this is largely down to the length of run (volt drop) opposed to the current carrying capacity. However at the source end of the cable the meter that’s been installed cannot accommodate this size of cable so installing this through an isolator first can the cable size then be reduced to fit in the meter. The small cable would still be well with the current carry capacity of the circuit and line with the protection device? What are peoples thoughts? Bad practice??



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    AJJewsbury:
    Hopefully a straight forward question:- I have a development where the submains supply is 70mm² XLPE/SWA/LSF and this is largely down to the length of run (volt drop) opposed to the current carrying capacity. However at the source end of the cable the meter that’s been installed cannot accommodate this size of cable so installing this through an isolator first can the cable size then be reduced to fit in the meter. The small cable would still be well with the current carry capacity of the circuit and line with the protection device? What are peoples thoughts? Bad practice??

    If it's coming after a meter on a normal DNO supply, you probably need your own overcurrent protection after the meter too (not just an isolator) - as most DNOs only mandate reliance on their fuse for the first 3m or so of consumer's cable (regardless of the actual impedances/physics).


    Ah, but this is described as a submain, so I assumed that it is a private meter with OCP upstream of it. I could be wrong as with any assumption.


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    AJJewsbury:
    Hopefully a straight forward question:- I have a development where the submains supply is 70mm² XLPE/SWA/LSF and this is largely down to the length of run (volt drop) opposed to the current carrying capacity. However at the source end of the cable the meter that’s been installed cannot accommodate this size of cable so installing this through an isolator first can the cable size then be reduced to fit in the meter. The small cable would still be well with the current carry capacity of the circuit and line with the protection device? What are peoples thoughts? Bad practice??

    If it's coming after a meter on a normal DNO supply, you probably need your own overcurrent protection after the meter too (not just an isolator) - as most DNOs only mandate reliance on their fuse for the first 3m or so of consumer's cable (regardless of the actual impedances/physics).


    Ah, but this is described as a submain, so I assumed that it is a private meter with OCP upstream of it. I could be wrong as with any assumption.


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