w_tom wrote:
You have not grasped the various type of transients, do not
understand why the IEEE defines what is necessary for protection, and
a few other technical facts posted below. Destructive voltages are
not between neutral and hot wire. That transient is made irrelevant
by protection already inside appliances - and other reasons.
Meanwhile, a 'whole house' protector also makes that type transient
irrelevant.

Seems you are a dummy Joseph.

Neither the IEEE or NIST guides consider hot-to-neutral transients
irrelevant. If they are irrelevant, ‘whole house’ protectors are irrelevant.


What does the IEEE demand as necessary for surge protection? IEEE
does not discuss differential voltage difference between two wires.

A major hallucination. Please get medical help.



IEEE Emerald Book (Powering and Grounding Sensitive Electronic
Equipment)
etc

The Emerald Book has plug-in suppressors among the devices that provide
protection. Why are plug-in suppressors in the Emerald Book w_?



Learn of many types of transients. To promote their product, plug-
in protectors would have you believe all surge types are same.
Nonsense. For example, you describe a surge that comes down a black
(hot) wire and leaves on neutral (white) wire. This is not the
typically destructive surge. Even utility power switching creates
another and typically more destructive transient. What happens when a
surge comes down any or all black, white, and green wires; and leaves
via phone wire, wooden table, linoleum floor tile, or any other
conductive material? Latter is the surge that does damage. When it
leaves, where does it go? Earth ground.

Both the IEEE and NIST guides say plug-in surge suppressors should be
multi-port. ALL signal and power wires to protected equipment need to
run thorough the suppressor. Repeating yet again, the voltage on ALL
wires is clamped to the common ground at the surge suppressor. There is
no damaging voltage between power and phone wires downstream from the
suppressor. The primary protection, as explained in the IEEE guide, is
clamping, not earthing. Both the IEEE and NIST guides say that protects
the equipment connected to the suppressor.

But I guess both the NIST and IEEE forgot about the wood table and
linoleum floor.




Bud's page 42 Figure 8 shows how a TV is damaged by 8000 volts.
Why? Destructive surge seeks earth ground; is not between two wires.

It is not my page. It is the IEEE’s page.

Trying to extract some meaning from rather illiterate writing - all
surges in the illustrations are between 2 wires (or sets of wires).

Because a plug-in protector was too close to TV, then the surge used
that TV to obtain what? Earth ground.

Not according to the text. The IEEE says “the vast majority of the
incoming lightning surge current flows through” the earthing wire from
the CATV ground block to the power service. The earthing current through
the TV or plug–in suppressor is minor according to the IEEE. The surge
is earthed, but the earthing is not through the TV or plug-in suppressor.

8000
volts would not exist between two wire if no protector existed.

Assuming this means at the 2nd TV, that is true. If there was no plug-in
suppressor at the 1st TV, there would not be 8,000V at the 2nd TV, it
would be 10,000V.

The whole point of this (fig.8) discussion in the IEEE guide is “to
protect TV2, a second multiport protector located at TV2 is required”.

And the point of all of this in the IEEE guide is do explain how plug-in
suppressors work. To protect his religious belief in earthing, w_ has
to twist the IEEE explanation to say the opposite.

Other points the IEEE makes he
“If the CATV, satellite, or phone cables do not enter the building near
the service entrance, the only effective way of protecting the equipment
is to use a multiport protector.” It is common to have entry points for
phone, CATV or satellite to be distant from the power service. That
prevents establishing a “single point ground”.

Since CATV entry ground blocks do not limit the voltage from core
conductor to shield that voltage, according to the IEEE guide, is only
limited to the breakdown voltage of F connectors, typically 2000–4000V.
“There is obviously the possibility of damage to TV tuners and cable
modems from the very high voltages that can be developed, especially
from nearby lightning.”
CATV wires going through a plug-in suppressor will have that voltage
limited.


There follow lots of quotes. Few are relevant. None say plug-in
suppressors are NOT effective.


But the IEEE and NIST guides both say plug-in suppressors are effective.

And, as always, no links from w_ that say plug-in suppressors are NOT
effective. Only his religious beliefs and distortions of sources. Where
are your links?

--
bud--