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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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    davezawadi (David Stone):

    I suggest you enquire how much a new cable from the sub to your house explicitly (3ph 100A) would cost. It looks to be 50 or 60m and this should cost quite a lot less than the quote. I got a 200A one to a building by WPD a couple of years back and this was across roads and pavements and about 150m, for about that price. This cable seems to run under a field or something where there are already the existing ones, and the trenching etc should be quite cheap. You could also ask if a HV overhead to your property and a pole TX would cost less, it would only be two new poles I think if the incoming HV is aerial which I expect. Does the workshop need 3 phase, for anything much it is well worthwhile as 3 phase machines are much cheaper on the 2nd user market! There are a number of ways available...


    Thanks Dave.  The workshop is a bit of a glorified name for my fancy large shed. I harbour an ambition to learn woodworking/carpentry skills at some point in the future, but I don't think I will have any fancy heavy duty tools. We'll probably have a chest freezer out there and some lighting. Maybe a chop saw. Plus a large amount of the kinds of stuff people keep in sheds that provide winter accommodation for mice and spiders ?


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  • 0
    davezawadi (David Stone):

    I suggest you enquire how much a new cable from the sub to your house explicitly (3ph 100A) would cost. It looks to be 50 or 60m and this should cost quite a lot less than the quote. I got a 200A one to a building by WPD a couple of years back and this was across roads and pavements and about 150m, for about that price. This cable seems to run under a field or something where there are already the existing ones, and the trenching etc should be quite cheap. You could also ask if a HV overhead to your property and a pole TX would cost less, it would only be two new poles I think if the incoming HV is aerial which I expect. Does the workshop need 3 phase, for anything much it is well worthwhile as 3 phase machines are much cheaper on the 2nd user market! There are a number of ways available...


    Thanks Dave.  The workshop is a bit of a glorified name for my fancy large shed. I harbour an ambition to learn woodworking/carpentry skills at some point in the future, but I don't think I will have any fancy heavy duty tools. We'll probably have a chest freezer out there and some lighting. Maybe a chop saw. Plus a large amount of the kinds of stuff people keep in sheds that provide winter accommodation for mice and spiders ?


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