On Mar 25, 1:43 pm, "Twayne" wrote:
Earth ground is NOT the most critical protection object. It
isn't even necessary for protection from longitudinal surges,
in fact. This is a mess of guesses with an attempt to
hopefully sound like you know what you're
talking about, but you don't.

So why do all telcos require their protectors connected from each
wire to earth? Why does every telco bring every wire into underground
vaults where a protector connects within feet to earth - for
longitudinal mode transients? And why has this been the routine
solution for over 100 years?

Why does the NIST say grounding is required for protection?
You cannot really suppress a surge altogether, nor "arrest" it.
What these protective devices do is neither suppress nor
arrest a surge, but simply divert it to ground, where it can
do no harm.

So the NIST also has it wrong?

IEEE Standard 141 (Red Book) says:
In actual practice, lightning protection is achieve by the process
of interception of lightning produced surges, diverting them to
ground, and by altering their associated wave shapes.

What is lightning? A longitudinal mode surge. So the NIST is
wrong. The IEEE is wrong. The US Air Force is also wrong when
protector are required to located as close to where wires enter the
building and earth ground?

Instead of posted anything technical, you also post insults? Of
course. That is what the less technically informed do. Where is this
IEEE paper that shows longitudinal mode protection is without earth
ground? Every paper I read is always about earth ground. Even this
professional's application note says every wire must connect to earth
before entering the building. But since you know better, then the
professional is lying? We should believe you only because you can
insult?

From Compliance Engineering entitled "Resettable Circuit Protection
for Telecom Network Equipment" is:
In longitudinal mode, the overstress is present between tip-and-
ring
and ground. Longitudinal overstresses are the most common and
occur during power induction or power crosses in which both
conductors have the same exposure to the hazard. Lightning-induced
overstresses are typically longitudinal

IOW longitudinal surges seek earth ground destructively via
electronics. How do you stop it? Do you magically stop what even
three miles of sky could not? Of course not. Do you magically make
that energy just disappear? Of course not. The routine solution for
over 100 years is to do even what Ben Franklin lightning rods do.
Connect the longitudinal mode surge to earth. The energy is not
inside the building hunting for earth ground destructively via
appliances.

The NIST says how critical earth ground is:
A very important point to keep in mind is that your surge protector will work
by diverting the surges to ground. The best surge protection in the world
can be useless if grounding is not done properly.

So, if earth ground is not important, then Franklin was wrong to
earth his lightning rods? That is what you have posted. Franklin's
lightning rods work because lightning - a longitudinal mode surge - is
connected to earth. - where energy is harmlessly dissipated. Where is
that energy absorbed if not in earth? Please, show me this magic
device that can stop what three miles of sky cannot. That will
magically absorb hundreds of thousands of joules? When surge
protection is always about earth ground, how do you know they are
wrong? Because you can post venom? Why is earthing for surge routine
in every facility that can never suffer damage? And why has that
always been the solution for over 100 years? Clearly they must be
wrong because you can insult.