"Things happen" is a interesting way to say "houses burn down and kill everyone inside". And I don't believe that electrical standards were developed with the idea that houses could both consume and generate electricity.
replyNot to mention that most houses aren't up to current electrical standards, much less fire codes.
Are there lessons on safety that need to be learned here? We already know what the happy path looks like, and we've plenty of lessons on what the unhappy path will look like.
replyIt isn't as if electric charge coming from balcony solar panels is some new magical-seeming type of electricity.
Safety is statistical and depends on human behavior. Unexpected behaviors might appear. For example some places require a power outlet on kitchen islands because with out, people will use cords to the wall which creates tripping hazards.
replyAlso, why do wires have to be fixed to joists every 300 mm? It's not about the electrons.