On Apr 30, 4:23*pm, wrote:
It isn't magic, it is just energy that gets converted to heat in the
MOV., That works until the MOV burns up. That is why MOVs are rated by
the amount of energy they can convert and how fast.

Let's view those numbers. The protector is rated for how many
hundred joules? It will somehow absorb the hundreds of thousands of
joules in a surge? That is what bud promotes.

Meanwhile, even bud's citation (page 6) says what the effective
protector does. It does not absorb surge energy:
What these protective devices do is neither
suppress nor arrest a surge, but simply divert
it to ground, where it can do no harm.

Not absorb or stop a surge. Instead, MOVs divert (connect, bond,
conduct, shunt) energy harmlessly into earth. No wonder every
facility that has no surge damage also does better earthing.

NIST then states on page 17:
The best surge protection in the world can be useless
if grounding is not done properly.

Why? Earth ground is the protection. Or as Dr Ken Schneider (?)
says:
Conceptually, lightning protection devices are switches to ground. Once
a threatening surge is detected, a lightning protection device grounds
the incoming signal connection point of the equipment being protected.
Thus, redirecting the threatening surge on a path-of-least resistance
(impedance) to ground where it is absorbed.

Where are thousands of joules absorbed? In a protector rated for
hundreds of joules? In a protector rated to dissipate at most, tens
of watts? Of course not. Surge protection means massive surge energy
gets connected and dissipated harmlessly in earth - not inside the
protector.

A surge that does not enter the building will not overwhelm
protection inside every appliance. Just another reason why telcos use
'whole house' protectors, better earthing, and no plug-in protectors.
Just another reason why every wire that enters every CO first goes
underground, connects to well earthed 'whole house' protectors, and
typically locate the switching computers up to 50 meters separated
from the protectors. All this so that any surge is harmlessly
dissipated in earth - what provides protection.

Let's view those numbers. Notice no plug-in protector even claims
to provide that protection. bud must say anything to avoid that fact
and essential purpose of earthing: to harmlessly absorb surges
energy. A protector (a diverting device) is only as effective as its
earth ground. Hunderd joule MOVs do not work by absorbing hundreds of
thousands of joules from surges. Which is what a protector must do to
claim surge protection is its numeric specifications.

Solution to household surge damage starts with inspecting earth
ground for the secondary protection system. And yes, these is also
another (primary) protection system.