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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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    I am not sure what "overlay" means. Does it mean that a 185 mm² cable will be added to the existing 95mm² one or replace it?


    If it is replacement, then the added current carrying capacity is around 100 A per phase, which is a wee bit more than you want, but it does seem to gobble up most of the extra. So if they were upgrading, they would use 185 mm², but with the addition, it has to be 300 mm²; in which case it would not be unreasonable for you to pay the difference at least to your service cable.


    On the other hand, if the new cable is added, there would appear to be plenty of capacity to supply the new build with 185 mm² cable so I can see the problem from Morgan's point of view.


    Equally, one might argue that if the cables are paralleled, an extra 95 mm² would have done, but now 185 mm² is required instead. So either way, it doesn't seem unreasonable to me to be asked to contribute to the cost of next size up.


    Somebody more learned than I will doubtless explain.
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    I am not sure what "overlay" means. Does it mean that a 185 mm² cable will be added to the existing 95mm² one or replace it?


    If it is replacement, then the added current carrying capacity is around 100 A per phase, which is a wee bit more than you want, but it does seem to gobble up most of the extra. So if they were upgrading, they would use 185 mm², but with the addition, it has to be 300 mm²; in which case it would not be unreasonable for you to pay the difference at least to your service cable.


    On the other hand, if the new cable is added, there would appear to be plenty of capacity to supply the new build with 185 mm² cable so I can see the problem from Morgan's point of view.


    Equally, one might argue that if the cables are paralleled, an extra 95 mm² would have done, but now 185 mm² is required instead. So either way, it doesn't seem unreasonable to me to be asked to contribute to the cost of next size up.


    Somebody more learned than I will doubtless explain.
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