Neutral faults on three phase systems are notable and memorable when they happen to you, but are a long way from being commonplace, they are for the most part one of those things that you might know somebody it happened to (or somebody who knows somebody), but it is not something you really expect to ever experience.
PME/MEN style distribution wiring makes the things even less commonplace, albeit somewhat more dangerous when they happen.
Nobody designs single phase product to survive lost neutral or 400V line to line, and for the most part nobodies stuff blows up when you plug it in (And when it does, it is seldom because of a major mains brewup), generally a lost neutral causes you MUCH bigger issues then a few blown light fittings.
Failures due to gross sustained over voltage are a zebra, you have hoofprints and in the first instance should be thinking of something far more common like say a horse or a product design cockup.
You will also find that if you track down the standards for electrical supply to street furniture (And the ones for grounding of same) that they are quite detailed.
Old theatre air handlers are a law unto themselves, but the motor would almost certainly have been three phase, probably with no neutral, so not particularly relevant, but with old nightclub wiring who knows?
Line to line is usually a RED CEE connector, not something that it is easy to mistake for anything else.
Regards, Dan.