Very quiet here lately .
Anyway, under what circumstances should you notify -or not as the case maybe -the dno of a domestic charger .
I’ve always gone on the uk power network low carbon portal prior to works commencing and entered the answers and details for any domestic charger and a waited the response usually in less than 24hrs , but I seem to be competing with others who don’t .
any ideas ? Ty .
See Section 11 of the IET Code of Practice for EV Charging Equipment Installation (4th Ed).
Prior to commencing work if any of the following apply:
In addition, if you're working in an area that had looped supplies, for safety (i.e. prevent fires), it's recommended to defer installation until the DNO have sorted things you (again, risk is fires). A looped supply is one where the DNO service cable supplies one house in terrace, or semi-detached, then a loop is taken from the service head to to the next house (or even then to another, and possibly another). The problem with looped supplies is overloading the DNO cable ... and if you're installing at the last property, you will only see one service cable coming in.
Otherwise, notify within 28 days of completing the work.
5th Edition of the CoP is due out shortly (expected 18 September 2023, available to pre-order) . There will be additional guidance on looped supplies for dwellings in Section 6, as well as further guidance on vehicle-to-grid installations, and EV charging in prosumer's electrical installations with island mode capability.
See Section 11 of the IET Code of Practice for EV Charging Equipment Installation (4th Ed).
Prior to commencing work if any of the following apply:
In addition, if you're working in an area that had looped supplies, for safety (i.e. prevent fires), it's recommended to defer installation until the DNO have sorted things you (again, risk is fires). A looped supply is one where the DNO service cable supplies one house in terrace, or semi-detached, then a loop is taken from the service head to to the next house (or even then to another, and possibly another). The problem with looped supplies is overloading the DNO cable ... and if you're installing at the last property, you will only see one service cable coming in.
Otherwise, notify within 28 days of completing the work.
5th Edition of the CoP is due out shortly (expected 18 September 2023, available to pre-order) . There will be additional guidance on looped supplies for dwellings in Section 6, as well as further guidance on vehicle-to-grid installations, and EV charging in prosumer's electrical installations with island mode capability.
Prior to commencing work if any of the following apply:
- Maximum demand will exceed 13.8 kVA (60 A). (Some installers are setting load curtailment so that the max demand will not exceed 60 A)
Graham, Is that the same with single or 3-phase please? For SP, that would seem to leave little headroom for everything else when one considers the after diversity maximum demand, which as I understand it, is usually up to 18 kVA.
With EVs and PVs, the world of the ordinary domestic installer seems to have changed quite considerably.
Graham, Is that the same with single or 3-phase please? For SP, that would seem to leave little headroom for everything else when one considers the after diversity maximum demand, which as I understand it, is usually up to 18 kVA.
This thread's about domestic.
At 60 A single-phase is precisely the reason for this. The service cable to some older properties will struggle to deliver more, and requires a DNO upgrade. Don't forget, some domestic properties are still on a 40 A DNO fuse and single-phase supply.
And with a 3 phase domestic supply at 13.8 kVA (20 A per phase) you'd also struggle !
With three-phase supplies whatever the size, the DNO may need to check overhead etc. I guess if your MD isn't going to exceed your existing connection agreement, there would be no point in pre-notification?
I guess if your MD isn't going to exceed your existing connection agreement, there would be no point in pre-notification?
FWIW, my original (SP) supply is on a 63 A (or is that 60 A?) fuse.
I do wonder how many people are aware of their connection agreement. I know my new one only because it was agreed (or imposed!) prior to connection.
Back to the OP: no harm in enquiring (as opposed to notifying) except that the answer may be "no" in which case the householder may regret asking. So I can understand why some don't and 24Hour feels frustrated.
63 A (or is that 60 A?)
That would depend on whether it's a BS 88-3 cartridge fuse (63 A is the preferred value) or a BS 1361 (60 A is the preferred value).
So I can understand why some don't and 24Hour feels frustrated.
Yes, I've heard response times to requests can be lengthy (and even longer estimated time to upgrade if necessary) , and this is why a lot of companies instead of pre-notifying are load-curtailing so the MD < 60 A (where this is possible).
The frustration is not just domestic either. I think there are big challenges ahead.
Hi Graham,
The DNO did some work a couple of weeks on our single phase, domestic supply, our property is looped off the semi next door. The DNO has fitted a new 100A main fuse and holder (It was previously 100A, but decades old). The reason for the DNO intervention was that the neighbour wanted an induction hob fitted and the electrician wasn't happy with the supply arrangements and triggered the visit from the DNO.
Are the DNO likely to want to de-loop the supply for the provision of an EC charger? If the loop is fused at 100A, then surely that must indicate the loop has capacity for the EVCP. The DNO connections team want me to make a formal application before the planners will comment.
The DNO did some work a couple of weeks on our single phase, domestic supply, our property is looped off the semi next door.
If the cable comes from the pole to next door and my neighbours have a 100 A fuse, and I have a 100 A fuse, does that mean that the cable from the pole must be rated at 200 A?
I assume not on the grounds of diversity, but with large long loads, the assumption may no longer be valid.
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