Do they actually have to be Class I?
Kind Regards, John
This is what I said about boats, there is a problem with a boat in that any copper earth rod can cause electrolysis and eat away at the boats hull, so there are two common methods, one is a set of diodes which gives a 1.2 volt differential before current can flow, the other is the isolation transformer.
Since you can get class II battery chargers the easy way around the problem is have a large battery charger as the only direct connection to the shore supply, and all 230 volt within the boat is from an inverter connected to the battery.
So as already said
To be honest I would prefer that it was left down to the car makers. While there are some whoopsies at times they are generally minor and get fixed very quickly via recalls. They have the facilities and a lot of experience of failure modes and a number of other aspects.
All the vehicle should need is plugging into the mains - everything else left to them.
However this means every car needs to be designed not to require an earth, which means there is a problem as unless every electric car is made class II the outputs still need to be class I, this has happened with narrow boats, all shore connections have an earth one hopes TT with a steel not copper electrode and the boat may either import the earth from shore supply or not, it is up to the design of the narrow boat as to if class I or class II well an isolation transformer does not really make the boat class II the boat can have its own earth return, all it needs is to be sitting in a good conductor and it is.
It seems even boats have some odd things, a boat which has an earth problem using a shore earth can kill some one swimming past it in fresh water, but they need to touch it in salt water.
So as long as the car body is not connected to the bollards earth, and the bollard is not metal, it would not matter what earth is used, as no one can touch it, the earth would be needed so in the case of a car fire the supply would trip out, but it would one be required in the case of a fault, like burnt out isolating transformer.
Charging a car is more like using a shaver there is a transformer some where to step the voltage up or down, all it needs is for that transformer to be of an isolating type.
Why the car is supplied with 230 volt AC rather than DC at under 70 volt I don't know, maybe there will be a car designed for use where there is an earthing problem, you simply park it over and induction loop or something?
However as it stands there is a problem, and any electrician who installs a charging point needs to be aware of the problems and take measures to minimise them, on another forum there was an "electrician" asking questions about earthing after just having completed the installation course, so it seems "electricians" are unaware of the dangers. OK I would not personally call the guy an electrician, I would assume some one who has retrained for what he thinks is a job with prospects, fitting charging points. But that worries me, if I trip and touch a car or charging point I don't want to get a shock.