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Help wanted to read/understand an electrical supply plan from DNO - updated new query

Morgan Phillips
EDIT: I 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?



Original question (already answered):Can anybody assist me in understanding what an existing plan provided by my DNO is showing, and what this means for my request for a new supply please? I've had a very large quote to connect our new house (a passive house) to the network, and am not certain that it is quite right. It appears to be asking us to upgrade the local supply from a 95mm2 cable to a 300mm2 cable, and I am being asked to pay 70% of the cost of that. I was told that if this isn't done, the lights would go out for the rest of the street. I'm not an electrical engineer, so am looking for knowledge with which to go back and discuss the quote. Thanks!



Plan of existing supply.pdf


Plan of proposed new supply.pdf
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  • 0
    thanks BOD! Don't want to keep you from your bed...?


    I am a self-builder, so just the one house. I had budgeted about £5k for an electricity connection, so this quote came as rather a shock (no pun intended ?)


    I made my application through an online portal on WPD's website (I don't think it's possible to obtain a copy) and received back a quote/letter of offer with the proposal as set out on the plan attached at the top. I subsequently had a telephone call from the very pleasant chap who had done the legwork and had come up with the proposal.


    I asked a lot of questions about why/how this was necessary for my modest supply to be met, and didn't really get a very satisfactory answer to that beyond 'I put in the information and this is what it comes back with'. It was difficult to get an answer to the question about why our proportion of this work would cost 70% of the total. He said something like 'we put in all of the numbers, and the remainder (30%) is the leftover capacity after you have been connected'. This makes no sense to me as all of the houses in the street seem to come from one modest cable, and we would be putting in a much larger cable. We can't be using the majority of that supply ourselves.


    I am keen to understand whether the supply was already in need of an upgrade, and this is an opportunity for WPD to do that work at largely my expense. If so, I would go back and contest the quote.  As someone else has suggested, it might be a lot less for me to have a supply direct from the Tx 60m to the north of my plot.


    Sleep well,

    M
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  • 0
    thanks BOD! Don't want to keep you from your bed...?


    I am a self-builder, so just the one house. I had budgeted about £5k for an electricity connection, so this quote came as rather a shock (no pun intended ?)


    I made my application through an online portal on WPD's website (I don't think it's possible to obtain a copy) and received back a quote/letter of offer with the proposal as set out on the plan attached at the top. I subsequently had a telephone call from the very pleasant chap who had done the legwork and had come up with the proposal.


    I asked a lot of questions about why/how this was necessary for my modest supply to be met, and didn't really get a very satisfactory answer to that beyond 'I put in the information and this is what it comes back with'. It was difficult to get an answer to the question about why our proportion of this work would cost 70% of the total. He said something like 'we put in all of the numbers, and the remainder (30%) is the leftover capacity after you have been connected'. This makes no sense to me as all of the houses in the street seem to come from one modest cable, and we would be putting in a much larger cable. We can't be using the majority of that supply ourselves.


    I am keen to understand whether the supply was already in need of an upgrade, and this is an opportunity for WPD to do that work at largely my expense. If so, I would go back and contest the quote.  As someone else has suggested, it might be a lot less for me to have a supply direct from the Tx 60m to the north of my plot.


    Sleep well,

    M
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