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My DNO should upgrade the fuse for free but what would be a reasonable charge by BG for supplying and fitting the priority box etc. so I can check they are not going to rip me off?
Don't get them to do it, get a local Sparky to do it as they'll be cheaper and do a better job even if BG will do it at all.

Really you need two priority boxes or a charge point that will manage its load based on overall usage.
 

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Really you need two priority boxes or a charge point that will manage its load based on overall usage.
You can get a non-priority box that can control three loads: Garo 1 Row 3 Showers 40A EV Charger Non-Priority Distribution Board / Consumer Unit

This allows whichever of three loads comes on first to take priority over the other two loads. In practice this works fine for things like EV charging, when it's not likely that a car will be charging at the same time as other high current loads are in use.
 

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Just want to be thankful you don't live in France, or one of the other countries that have load-dependent tariffs. The "normal" supply in France is 6 kVA for a standard domestic tariff, and to enforce that EDF fit a disjoncteur différentiel to the incoming supply that trips the whole installation out if the tariff limit is exceeded. If you want to install a 32 A charge point you need to pay out for one of the higher tariffs, when EDF will then fit a higher rated disjoncteur différentiel to alloe a higher current to be drawn from their supply.
 

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Spoke to the energy ombudsman today. Despite the issues surrounding my house load assessment they found it incredible that BG could not proceed albeit with the additional work as outlined by the experts on here. Waiting since October is in their words "simply not good enough". Let's see what they can do to get things moving. Anyone thinking about getting an EV point I certainly wouldn't recommend BG (HIVE).

That far down the road now though I feel we have to keep going with them before the Government grants go in March.
 

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Discussion Starter · #28 ·
Your existing garage supply is only 32A, and will probably be run using 6mm² cable. Given you have garage sockets and lights on the same circuit that cable would likely need upgraded. You can also see that the cable has through crimps inside the consumer unit which I would not feel especially confident relying on for continuous 32A charge.

The garage supply is also broken somewhere else as it’s 3-core SWA (probably) at the garage end but looks like Twin&Earth at the consumer end (colours don’t match). This could be where it emerges through the building wall (is there a box on the outside with the black cable going into it?).

The only real option you have without upgrading the cable would be to have a charge point that monitors the load on the garage supply (using a CT clamp) and restricts the charge rate of the car while other loads in the garage are turned on.

The garage end has a number of issues which need resolved. Primarily the box is not really suitable and would be best replaced with an actual mini-consumer unit that has dedicated neutral and earth bars (the way all the neutrals are stuffed into the bottom of the RCD is nasty). The other issue is that the 63A RCD in that box is type AC and needs to be upgraded to at least a type A.
Hi, Sorry for the delay as I was away for work. There isn't a box on the outside, only a black thick cable coming out of the ground and up the wall of the garage and through the wall at the top where it comes out inside. I will probably get a couple of survey / quotes done for any extra work needed, thank you.
 

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Hi, Sorry for the delay as I was away for work. There isn't a box on the outside, only a black thick cable coming out of the ground and up the wall of the garage and through the wall at the top where it comes out inside. I will probably get a couple of survey / quotes done for any extra work needed, thank you.
The crimps are in this photo, and I very definitely would not want to run 32 A through these for hours on end:

Circuit component Hardware programmer Electronic engineering Electronic instrument Electronic component
 

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The crimps are in this photo, and I very definitely would not want to run 32 A through these for hours on end:
There is another junction somewhere between there and the garage though as the garage end is in 3-phase colours with tape, but the consumer unit end (even after the crimps) is in brown/blue single phase colours.

If the crimps are anything to go by I’d want to inspect the additional junction too!
 
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