"LN 330V LG 330V NG 330V" simply says that up to 330 volt
transients of any type can directly confront the appliance and
will be ignored by the protector. Just another reason why
appliances must have internal protection. It does not say
which type of transients above 330 volts will be seen.

Protectors (if I remember correctly) must list these
threshold or let-through voltages AND must also list their
joules to obtain a UL approval. Grossly undersized plug-in
protectors often hope you will overlook the joules rating.
Joules determine a protector's life expectancy. A protector
that fails on the first transient is grossly undersized -
ineffective.

Described in that Tucson home is what should be installed in
all new buildings. Ufer grounding is one of the most
effective earthing methods. A 10 foot earth ground rod is
sufficient for human safety. But for transistor safety, a
better earth ground means superior transistor safety. An Ufer
ground costs so little and does so much. But it means the
protection system (earthing) must be planned before footing
are poured. Better protection that costs so little starts
with the very first construction activity - when footing for
the foundation are constructed. Unfortunately, we still
build new homes as if the transistor did not exist.

Rudy wrote:
So are you saying that this "protector" isn't capable of protecting
my computer or TV now ? It doesn't say how many joules its rated
for, just the following : LN 330V LG 330V NG 330V Does this
go for the millions of surge protectors that nearly every home in
North America is using to protect their home electronics ?

As far as grounding goes, my former home (also in the Tucson
monsoon area) was grounded by a ~ 1/8" copper ground wire
connected thru my service box to the rebar in the foundation.
There was another one from the Satellite dish, to the bottom
plate J bolts to the rebar again

R