On May 7, 1:48*pm, westom wrote:
On May 6, 6:27*pm, wrote:

Even with a multi-portprotector(D) for TV1, the ground voltage
at D is conveyed to TV2 by the coaxial cable, resulting in an
8,000 V potential across TV2, which will probably destroy it.
A second multi-portprotectoras shown in Fig. 7 is required to
protect TV2"

* What did that protector do?

According to the IEEE guide, the plug-in surge protector protected TV1
from damage. And they clearly state that had TV2, ie the damaged TV,
had a plug-in, it too would have been protected. They state that
the lightning strike raises the ground potential at one end of the
house by thousands of volts and that is carried by the COAXIAL CABLE
to damage TV2. In other words, everything, as usual is 180 deg
opposite of what you claim it says.



*To provide protection, surge energy
must be dissipated somewhere. *A connection to earth was 8000 volts
through TV2. *Or you must spend $5000 or $15,000 for plug-in
protectors for everything ... dishwasher, microwave, bathroom GFCI,
dimmer switches, timer switches, smoke detectors ... to have
protection. *IOW enrich bud.

The above claim that it costs $5K- $15K for plug-in surge protectors
for a house gives a good view into your lack of grounding in
reality. Pun intended.




* Where damage can never happen, ie telco CO (switching center), they
don't waste money on plug-in protectors. *Responsible facilities earth
a 'whole house' protector on every incoming wire.

As I pointed out to you in a previous thread, not only does the telco
CO have surge protection at the point of entry, they also have surge
protection on every line card where the phone line actually terminates
at the CO switch. That protection typically includes MOVs, which
operate on the line card, as they do inside appliances or plug-in
surge protectors. Which is to say protection is provided without the
benefit of a direct short connection to earth ground, which is 180 deg
opposite to what you claim. I even provided you with a datasheet from
National Semiconductor for their line card semiconductors, where they
discuss the fact that protection must be provided on the line card.
One more credible reference that refutes what you claim, but you just
ignore.





*Now the surge need
not find earth ground destructively through TV2, the furnace, washing
machine, etc. * *Instead, the surge is earthed before entering the
building. *Effective protection for about $1 per appliance.

* Or we can argue to create more confusion. *If the surge enters a the
breaker box and is then earthed five feet outside that box, is a surge
in any bedroom, living room, hallway, kitchen, etc? *Of course not.

Of course all the credible references say that just isn't so. Bud
has explained this to you a dozen times. A lightning strike has such
a high current, that even with a well grounded system, the current
going through the whole house surge protector can result in thousands
of volts still being present. Do the math. 10,000 amps times 1
ohm=?



Because that surge does not enter the building - no matter how trader
spins confusion.

Explained to you yesterday, why this is wrong X2. Not only is a
surge still possible even with a whole house protector, but even the
main surge going through the whole house protector, in most cases, is
actually inside the house because the AC panel with the surge
protector is typically located inside the house.





* Next trader will discuss airplanes to create even more confusion?

* Page 42 Figure 8. *A surge is permitted inside the building. *Surge
finds earth ground such as 8000 volts destructively through TV2.
Surges earthed before entering a building will not overwhelm
protection that is already inside every appliance. *Anywhere that
surge damage cannot happen: earthing and a 'whole house' protector.
No earth ground means no effective protection.

How is it that aircraft at 40,000 feet are protected then?


*OR the surge finds
earth ground 8000 volts destructively through adjacent appliances.

* How curious. *bud's NIST citation says the exact same thing:
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.

* Page 42 Figure 8. *No earthed protector. *So that protector simply
*diverted* that surge 8000 volts destructively through TV2.

As Bud would say, the lie repeated.




* *Page 42
Figure 8 - even the world's best power strip is useless BECAUSE
grounding is not done properly.

Which of course is NOT what the referrence actually says:

"Even with a multi-port protector (D) for TV1, the ground voltage at D
is conveyed to TV2 by the coaxial cable, resulting in an 8,000 V
potential across TV2, which will probably destroy it. A second multi-
port protector as shown in Fig. 7 is required to protect TV2."