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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 Alcomax over 4 years ago

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

SD5G/5 (Part 1)

29.10.2020

Design Standards: Low Voltage
Relating to the Connection of Low Carbon Technology (Electric Vehicle Charge Points and Heat Pumps) with a Capacity < 32A per phase

This document details the approach for managing Electric Vehicle (EV) Charge Point and/or Heat Pump (HP) installation notifications and applications for individual or multiple equipment (installed beyond the same point of supply) rated up to 32A per phase onto Western Power Distribution’s (WPD’s) distribution network (low and high voltage).
Main Changes

The charging methodology for cutout replacement and service cable overlays has been changed.

When a service cable is being overlaid due to a low capacity, the cable shall be overlaid with a three phase cable.
Impact of Changes

Western Power Distribution (WPD) will provide free of charge service upgrade costs for domestic installations (profile 1 or 2) where each item of low carbon technology has a rating < 32A.
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0 Alcomax over 4 years ago

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

SD5G/5 (Part 1)

29.10.2020

Design Standards: Low Voltage
Relating to the Connection of Low Carbon Technology (Electric Vehicle Charge Points and Heat Pumps) with a Capacity < 32A per phase

This document details the approach for managing Electric Vehicle (EV) Charge Point and/or Heat Pump (HP) installation notifications and applications for individual or multiple equipment (installed beyond the same point of supply) rated up to 32A per phase onto Western Power Distribution’s (WPD’s) distribution network (low and high voltage).
Main Changes

The charging methodology for cutout replacement and service cable overlays has been changed.

When a service cable is being overlaid due to a low capacity, the cable shall be overlaid with a three phase cable.
Impact of Changes

Western Power Distribution (WPD) will provide free of charge service upgrade costs for domestic installations (profile 1 or 2) where each item of low carbon technology has a rating < 32A.
Cancel
Vote Up 0 Vote Down

Cancel

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

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