400V is already beyond dangerous, raising it won’t kill you any faster. There’s probably decreased risk because of lower current (less heat to melt things).
EVs have a system that disconnects the battery mechanically when a high speed impact happens. I don’t think there have been any electrocution incidents so far?
Good. They are designed to prevent injuries to first responders (which are nearly always exposed to some hazard when responding to a vehicle accident.)
I did a search and could find no reports of injury to first responders.
