On May 4, 2:55 pm, wrote:
I don't agree with that assessment of the plug-in protector. If the
appliance has its own MOVs to protect stuff, then this would be true.
Not all do. Some appliances are more sensitive than others. It just
depends on what kind of surge is arriving, and where from. If it is
differential mode on the power wires, the plug-in protector can do
some important protection. Even with whole house protection in place,
you can have some energy get past it, and the surge can be induced into
the building wiring. Usually the induced surge is common mode, which
by itself is less of a problem.

In short, your post is saying what my post said. 120 volt
electronics have long had protection up to 600 volts as defined by
industry standards. This was always accomplished without MOVs.
Notice all the dimmer switches replaced weekly due to surge damage?
Not replaced because even those devices contain significant internal
protection - without MOVs.

The differential mode surge (what a plug-in protector can protect
from) typically does no damage as indicated by the large numbers of
appliances - even smoke detectors - that survive these trivial
surges. Survive without MOV protectors because internal protetion is
provided as part of the design - not an add on provided by MOVs.

The typically destructive surge occurs maybe one every seven years.
This is the surge that must be earthing before entering building.
This is the surge that so easily overwhelms protection inside
appliances. This is the surge that makes the properly earthing 'whole
house' protector necessary and so effective.

Yes, it is possible to make other protectors - absorption type.
Industry benchmarks also provide other examples including bulkheads.
Surges running through these bulkheads are further impeded. But each
is supplementary protection. To be effective, typically quite large
or expensive (Surgex, Brickwall, Zerosurge, etc). . How much is one
willing to spend? Effective supplmentary protection is also quite
expensive. Anything less is already found inside an appliance.

Yes, a plug-in protector can provide protection. Does it increase
protection by 80% or 95%. Protection so massive that the homeowner
may never see another surge in his lifetime?. Even a simplest
(properly installed) 'whole house' protector should provide protection
that significant. Without that 'whole hosue' protector, then plug-in
protectors may even contribute to appliance damage. To be effective -
to not contribute to damage of an adjacent appliance, a plug-in
protector needs a properly earthed 'whole house' system. Again, I
have not talked pass Bud. Bud promotes supplemental protection as a
complete solution. Defined by you and I are a surge a plug-in
protector might protect from AND why a plug-in protector can also
contribute to appliance damage.

Yes, your TV antenna examples are also correct - including how
either can be damaged. That being too complicated for most readers
AND irrelevant if both antenna wires are properly installed. Before
antenna wires enter a building, both antenna wires must first make a
short connection to the single point earth ground - meaning protection
standard in TV tuners should not be overwhelmed. Same protection also
installed by the cable company.

Only Bud is limiting himself to one aspect of the issue. You and I
are both discussing the many types of surges including the other that
typically causes most damage. Bud must ignore that typically
destructive surge. Those surges also create Page 42 Figure 8 - 8000
volt earthed destructively through an adjacent TV. Those surges are
why his other citation says:
The best surge protection in the world can
be useless if grounding is not done properly.
Those surges that typically do damage AND that plug-in protectors do
not claim to protect from - Bud ignores that entire discussion.