Where I do have a little doubt over “standard installation” is with cable. Have read that up to 15m is classed as standard and I reckon we’re right on the limit. Also when going underground, this along with distance can cause a voltage drop. The answer is to go for 10mm cable instead of 6mm and assuming they possibly won’t want to do that can I insist and then pay the extra. Think I might even need armoured cable as it’ll be partially underground in the conduit.
Congrats!
Ohme will most likely install a small EV charger consumer unit and use Henley blocks to connect to the tails comming from the meter, as is normally best practice and keeps the circuit away from your house consumer unit, which is better for you anyway. However, your money hasn’t been wasted upgrading, as SPD and Type AC RCD? will protect sensitive electronic equipment like TV’s etc.
Ohme contractors will use 3 core 6mm2 SWA and run a seperate data cable.
Depending on the installation method 6mm2 SWA has a max current of:
Clipped direrect – 53 Amps / In free air 56 Amps / Direct ground or ducting 44 Amps
Resistance mV/A/m for 6mm² SWA = 7.3 mV/A/m
Even accounting for factors i.e installaton method, cable temperature, you will be well within your limits at 15 -20 meters using 6mm2,