Interesting. I had a brief email exchange with Ohme to get an idea of their costs (which they didn’t give). They did, however, indicate the supply would come from the main CU ‘if’ the installer could get a suitable ‘Type B RCD’. The CU is supplied with 25mm tails from a 100amp DNO fuse and has spare capacity for the breaker(s). However, that CU is an F&G concept which is now defunct, although there are plenty of used breakers available, but nothing new that is compatible.
My second CU has no capacity for an EV Charger. The idiot so called ‘Napit and other multiple certified bodies’ sparks he is a member of used 16mm tails when it was expressly stated 25mm to accommodate a future EV Charger. If often draws 30-35 amps in its current state, so a further 32 amps is out of the question (hence it should have been 25mm tails). Changing the tails is out of the question, they were installed into the wall cavity during building work and he clipped them to the inside of the internal wall leaf (seriously !).
So, if there is no way around the issue with the defunct CU, I’m left with a third CU. I have no room for another CU inside the property, so it would have to go outside. Also, I insisted the double pole Henley block the electrician installed was removed and replaced with two single pole units, so space is going to be tight in the meter box for a third set of tails. (Long story, but I’ve witnessed my neighbour’s house go up in flames due to a recently fitted double pole HB failing.
Looking around an IP66 CU fully loaded for an EV Charger is around £40, and an extra 5 metres of SWR isn’t that big a deal. However, trying to establish what Ohme will charge for that is like pulling teeth.