davezawadi:

You have hit the nail on the head there Graham. In fact there is no completely safe way to charge class 1 electric vehicles when the supply system is TNC-S. The whole system is "unsafe" in all usage once we start on the "what if" scenarios. For every other use we deem the TNC-S system "safe enough" for normal consumers, and the number of accidents is tiny, and usually stems from stupidity of some kind (taking the heater or radio in the bath for example). The current obsession with RCD protection and AFDDs is another part of this attempt to stop any conceivable risk at any cost, something which is  obviously an impossible goal. At the moment there are not many Ecars, so the way to make charging safe is simply to set the goal as making all new ones class 2. They can make RH drive cars, so why not class 2 ones (although this is probably not needed in Japan with 100V nominal mains often less than 90V). Now is the time for leadership, there will be no sales for months so now is the time made available to tweek a bit of electronics in a fairly simple way. In fact for a sensible fee I will do the work for them! Then PROBLEM GONE forever! All over the world, now that really is an improvement in a time of crisis. The remaining older class 1 cars will not present much risk, and nothing needs to be done to existing charging points, it is just that new ones will be simpler and safer in use. We can make virus tests, drugs, ventilators etc very quickly once there is a good reason to do so, there seems to me to be a very good reason to fix EVs. We can also throw 722 away to the annals of history to everyone's great delight.

davezawadi:

You have hit the nail on the head there Graham. In fact there is no completely safe way to charge class 1 electric vehicles when the supply system is TNC-S. The whole system is "unsafe" in all usage once we start on the "what if" scenarios. For every other use we deem the TNC-S system "safe enough" for normal consumers, and the number of accidents is tiny, and usually stems from stupidity of some kind (taking the heater or radio in the bath for example). The current obsession with RCD protection and AFDDs is another part of this attempt to stop any conceivable risk at any cost, something which is  obviously an impossible goal. At the moment there are not many Ecars, so the way to make charging safe is simply to set the goal as making all new ones class 2. They can make RH drive cars, so why not class 2 ones (although this is probably not needed in Japan with 100V nominal mains often less than 90V). Now is the time for leadership, there will be no sales for months so now is the time made available to tweek a bit of electronics in a fairly simple way. In fact for a sensible fee I will do the work for them! Then PROBLEM GONE forever! All over the world, now that really is an improvement in a time of crisis. The remaining older class 1 cars will not present much risk, and nothing needs to be done to existing charging points, it is just that new ones will be simpler and safer in use. We can make virus tests, drugs, ventilators etc very quickly once there is a good reason to do so, there seems to me to be a very good reason to fix EVs. We can also throw 722 away to the annals of history to everyone's great delight.