"Don Y" wrote in message
...
Ground is never ground. A nearby lightning strike can have "ground"
bounce, considerably. Note that there is a huge magnetic event
("EMP") associated with a lightning strike. This "induces" voltages in
conductors -- even buried ones!

Note that these "disturbances" can follow conductors into equipment
attached at both ends.

I've arranged for each of the network drops, here, that is accessible
"on the outside of the house" (though still part of this same building)
to have protection from lightning -- as well as tampering/vandalism
(e.g., you wouldn't want someone to "do something" to an accessible
ethernet drop and take down some/all of your network infrastructure
because they were of a hostile intent!


Right, there are two ways to do it, half-assed and hope for the best. That
will stop some of the slight misses. Then you can do it the right way and
probably spend more than the equipment it is worth.

One of the better way is to make sure all the ground rods are tied together
with wires as short and direct as possiable.


Just check the insurance and see how much is covered by the lightning.