Unforturnately, some think that switching off the circuit
breaker (before turning on generator) is sufficient to isolate
generator from AC mains. Then it takes a human death to
convince them otherwise. The same switch that connects a
generator must first disconnect connection to AC mains.
Switch must perform a 'break before make' function. That
should be the most important point made here.

A connection that requires anything more of a human
(requires separate switching of a breaker box circuit breaker)
would be criminally negligent homicide - that despicable.

Me wrote:
They will learn that, the first time they actually NEED the generator to
power something, when it is meserably cold and wet....then they will be
back asking questions on why their cheapie generator didn't hold up when
they needed it......