Distance between other electrical systems

Reading this makes me realise just how badly thought out EV charging is (again). Typically every multiple EV charging point is defective because each has its own electrode following the regs. Two adjacent cars can be at differing potentials. Chris is quite correct here (and BS7671 a mess) because a TT installation inherently depends on the RCD to provide shock protection, and therefore ANY fault with danger must simply trip the RCD if contacted. Simple enough and has worked very well for many years. However people are now worrying about potentials rather than disconnection on contact, which is simply not sensible. TT does not work unless there is a potential and earth path sufficient to trip the RCD! My reading of multiple earth systems is a TN-S and a TT one, not two TT systems, because they are inherently protected from danger by the RCDs. TT islands do not work for car charging unless you trust the RCD. Clearly some do not, and the "what if" question immediately makes all this unworkable, particularly when the H&S police have had a go too! The answer is simple and can be fixed immediately by a simple bit of legislation; "Electric vehicles must be class 2, otherwise they may not be sold in the UK". All those not complying may be sent abroad when sold, and the owners suffer a loss like my diesel car, government about turns included! Fair enough and the proper way to sort the problem, which should never have happened in the first place if those responsible had been paying suitable attention!

Reading this makes me realise just how badly thought out EV charging is (again). Typically every multiple EV charging point is defective because each has its own electrode following the regs. Two adjacent cars can be at differing potentials. Chris is quite correct here (and BS7671 a mess) because a TT installation inherently depends on the RCD to provide shock protection, and therefore ANY fault with danger must simply trip the RCD if contacted. Simple enough and has worked very well for many years. However people are now worrying about potentials rather than disconnection on contact, which is simply not sensible. TT does not work unless there is a potential and earth path sufficient to trip the RCD! My reading of multiple earth systems is a TN-S and a TT one, not two TT systems, because they are inherently protected from danger by the RCDs. TT islands do not work for car charging unless you trust the RCD. Clearly some do not, and the "what if" question immediately makes all this unworkable, particularly when the H&S police have had a go too! The answer is simple and can be fixed immediately by a simple bit of legislation; "Electric vehicles must be class 2, otherwise they may not be sold in the UK". All those not complying may be sent abroad when sold, and the owners suffer a loss like my diesel car, government about turns included! Fair enough and the proper way to sort the problem, which should never have happened in the first place if those responsible had been paying suitable attention!