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Follow up question: quote for connection and local supply issue

Morgan Phillips
Thanks for the fantastic replies I had to my previous question, helping me to understand the supply locally and enabling me to successfully push back on the quote/plan provided. 


I now have one further query.


WPD say that if they were upgrading the local network they would overlay the current 95mm wcon cable with a 185mm wcon cable, but that this alone would not be sufficient to allow for my property to be connected to the local network. Instead, they said that for me to be connected, a 300mm wcon cable needs to be laid, and they want me to fund the difference between the 185 cable and the 300 cable. 


As they were less than scrupulously transparent in their previous quote, I would like to check if anybody has any thoughts on the veracity of this? Why would upgrading to a 185mm cable not allow sufficient capacity to add my supply? Why would they not, if doing an upgrade and presumably incurring significant cost, simply upgrade to future proof the local supply with a 300mm2 cable?


I'm particularly concerned that what they have said about replacing the 95mm2 cable with a 185mm2 cable (that this would not be sufficient to connect me to the supply) is untrue.

Plan of existing supply.pdf
Updated plan for new supply.png
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    Hello again

    Overlay normally means that a new cable is laid along the same route to replace the old cable.  Sometimes the old cable or sections of it is/are removed sometimes it isn't.


    Without more information on the existing loads I really cant give you a definite answer however if the overload on the existing 95mm2 cable is so severe that virtually all of the capacity of a 185mm2 cable would be needed that implies something approach a 70% overload and I would have expected problems before now.


    As a next step I would ask them what they are assuming about your new power requirements (they seem to be providing only a single phase service) and what the loadings are on the existing cable.


    Another alternative would be that they overlay the 95mm2 cable but re-use it to feed your new service.  It could simply be jointed to the new 185mm2 cable at source.  That way they might even save the cost of the breeches joint at the crook of the field.


    I would keep asking questions and see where you get to.
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  • 0
    Hello again

    Overlay normally means that a new cable is laid along the same route to replace the old cable.  Sometimes the old cable or sections of it is/are removed sometimes it isn't.


    Without more information on the existing loads I really cant give you a definite answer however if the overload on the existing 95mm2 cable is so severe that virtually all of the capacity of a 185mm2 cable would be needed that implies something approach a 70% overload and I would have expected problems before now.


    As a next step I would ask them what they are assuming about your new power requirements (they seem to be providing only a single phase service) and what the loadings are on the existing cable.


    Another alternative would be that they overlay the 95mm2 cable but re-use it to feed your new service.  It could simply be jointed to the new 185mm2 cable at source.  That way they might even save the cost of the breeches joint at the crook of the field.


    I would keep asking questions and see where you get to.
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