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

How much power are you expecting to use at the Property? Is it three phase or single phase?

single phase. I wanted a 12.5kva supply but the DNO said that they will treat it as requiring 15kva (that is the level they have chosen to 'guarantee' supply of) with an 80A fuse. 

As the house is going to have A+++ appliances, it should not have very high peak demand for power.

Welcome OBW to the forum.


Difficult to say without knowing more detail.  It is looking like the existing supply to houses in the adjacent street has no spare capacity on the cable for your new house.


It looks like to provide you with a supply the DNO will need to upgrade the supply to the nearby street in order that they can provide you with a supply. The DNOs are money making businesses so they want you to pay a big chunk of their costs.


These pay be what are called contested works so you may be able to use an approved contractor to do the cabling with the final connection by the DNO which may be a cheaper option. 


IF you shout out the magic word "BOD" he may appear. WPD is his part of the world and he is used to dealing with supply issues like yours.

OBW


You may not need a large supply at the moment but when fosill fuel cars get band in 2030 you will need to charge your electric car.

Thanks John, yes we anticipate ultimately needing to charge an electric vehicle, although would do this the slow way. Am I right in thinking that it is possible to charge a car slowly over 24 hours using no more than 4kwh of power, do you know?

Others have mostly answered this but would add


From what I can see from plans, the new builds will be fed from LV [low voltage] pole on other side of the road. Ultimately, everything comes from the TX pole some 30mtrs north. The new build[s] are extra demand, so a larger cable will be required from TX pole to LV pole.


If they did not do this and simply connected in the new build, the lights would dim. I am sure others will provide a better answer, but this looks rural, semi rural location, so any demand over and above the designed capability of the existing infrastructure is going to need upgrading. If this was urban, the network would more likely be able to cope.


edit to add [as I was sent something in the last few weeks]

October Update EV chargers, low carbon etc


Best see what BOD says as suggested by others, but on the subject of overlay and costs the gist is something like this

Thanks Alcomax, yes, that is exactly what I'm trying to understand! I


t is a village, and the supply does seem to come from the TX to the north. What I'm trying to understand is what the lines on the plan mean - I understood the two turquoise lines off the 95 3c cable to be supplies running from that cable to individual houses, and then one further core running to the pole. What I'm struggling to see is why they can't run my supply from that cable, and how it powers the rest of the street. There is a 50mm2 2c cable that runs along a pole up and down the street. I'm not sure where the power for that is coming from.


I'm also a bit stumped by the maths of paying 70% of the new supply cable (300mm2) that they say is required, which as far as I can see will upgrade the supply for the area. This is quoted as around £14k. It seems it will benefit others (both existing properties and future properties), so the proportion we end up being charged seems high.

"BOD.....? Are you out there?" Assistance would be very much appreciated. ?

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.

thanks mapj1‍ that is what I suspected when I saw the quote -  I questioned the chap from WPD about why my modest supply request would be the death knell of the whole street's supply, but he was a bit coy and didn't mention that the cable is probably already at its upper limit.


I agree that we will all need home car charging facilities before long if the gov is serious about its aim to phase out petrol and diesel vehicles, and there is as always a question as to where the cost of upgrading an ageing network should fall.