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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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    Hi Morgan


    The increase to 185mm cable would undoubtedly cope with your load, but that may be oversimplifying the problem. It is not just the cost of the cable, but the cost of the trenches which they wish to share. You need to see the overall estimated price of the works, and the proportion which you are expected to pay to find out, and they may not wish to give you this figure! As suggested the lowest cost to you would probably be the 60m cable from Sub just to your property, but they wish to do much more than this. The largest cost of any of these schemes is likely to be the "civils" as we call them, the digging and construction works, not the electrical ones. You could try to get a quote from a groundwork contractor to trench the sub to your property and backfill after the cable is laid, which would probably be quite reasonable, and put this to WPD as a scheme. They would then want the connecting costs etc. to be added, but this would not be huge. The trench across bare land would probably cost less than £2k, (2 days total for digger inc backfill) and the cable etc perhaps the same again (50mm wavecon). That should give you a potential 200A 3 ph supply. Warning: they will make a lot of noise! Changing the whole run to 300mm is not a fair way to get the upgrade which I expect is urgent for them.
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  • 0
    Hi Morgan


    The increase to 185mm cable would undoubtedly cope with your load, but that may be oversimplifying the problem. It is not just the cost of the cable, but the cost of the trenches which they wish to share. You need to see the overall estimated price of the works, and the proportion which you are expected to pay to find out, and they may not wish to give you this figure! As suggested the lowest cost to you would probably be the 60m cable from Sub just to your property, but they wish to do much more than this. The largest cost of any of these schemes is likely to be the "civils" as we call them, the digging and construction works, not the electrical ones. You could try to get a quote from a groundwork contractor to trench the sub to your property and backfill after the cable is laid, which would probably be quite reasonable, and put this to WPD as a scheme. They would then want the connecting costs etc. to be added, but this would not be huge. The trench across bare land would probably cost less than £2k, (2 days total for digger inc backfill) and the cable etc perhaps the same again (50mm wavecon). That should give you a potential 200A 3 ph supply. Warning: they will make a lot of noise! Changing the whole run to 300mm is not a fair way to get the upgrade which I expect is urgent for them.
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