I know that there is a statement in the
regs about the number of lightning days
per year in the section on these devices
but it only has to happen once.
There was a strike around me some years
ago and Oh Boy, did it do some damage.
The directly affected house had all connected
equipment taken out, even those that were
not turned on at the socket.
Other houses in the area were also affected
and my office PC was also taken out. It
was a write-off.