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

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 mapj1 over 4 years ago

But that increase in demand for car charging will apply to the rest of the street on the 95mm² mm feed anyway even if this new house decides to have a genset instead.

I agree - it looks like that run from the substation to supply the Cemetry Road on the ABC (Aerial Bundled Cable - overhead supply to normal folk ) has already been running a bit thin for comfort, and your job is just the straw that breaks the camel's back in terms of triggering a network reinforcement exercise. To expect you to pay for some of it is reasonable, all of it probably not, and that is where the wriggling comes.

That said to overlay 95mm² with 300mm² is quite some expensive uplift for a mere 12kW of extra load, but then it is a run of 95 feeding two lots of 50mm² ABC on the Cemetry Road. Looking at the lengths, I suspect that they are close to (if not already) having voltage drop issues supplying those houses.
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0 mapj1 over 4 years ago

But that increase in demand for car charging will apply to the rest of the street on the 95mm² mm feed anyway even if this new house decides to have a genset instead.

I agree - it looks like that run from the substation to supply the Cemetry Road on the ABC (Aerial Bundled Cable - overhead supply to normal folk ) has already been running a bit thin for comfort, and your job is just the straw that breaks the camel's back in terms of triggering a network reinforcement exercise. To expect you to pay for some of it is reasonable, all of it probably not, and that is where the wriggling comes.

That said to overlay 95mm² with 300mm² is quite some expensive uplift for a mere 12kW of extra load, but then it is a run of 95 feeding two lots of 50mm² ABC on the Cemetry Road. Looking at the lengths, I suspect that they are close to (if not already) having voltage drop issues supplying those houses.
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Help wanted to read/understand an electrical supply plan from DNO - updated new query

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