w_tom wrote:
On Oct 16, 2:57 am, "John Gilmer" wrote:
We had two severe thunderstorms about 2 weeks apart. We lost a total of 3
motherboards. In the second incident, a new motherboard was taken out.
That's convinced me to: 1) just buy a new computer than screw about with MB
replacement; and 2) get UPS for each computer. The main risk to our
machines is now just the network cable. If we go wireless, we should be
safe from just about anything.

Now review that NIST discussion. What does a protector do? Page 8
of 24:

What does the NIST guide really say about plug-in suppressors?
They are "the easiest solution".

A second excellent guide on surges and surge protection from the IEEE is at:
http://omegaps.com/Lightning%20Guide...ion_May051.pdf
The IEEE guide also says plug-in suppressors are effective.


Your cable needs no protector because it
can be earthed without any protector.

Needs no protector? The IEEE guide notes that the voltage between cable
center conductor and sheath is limited by the breakdown of F-connectors
which is typically 2-4,000V. The guide notes that connected equipment
can be damaged at those voltages. Plug-in suppressors will likely clamp
the voltage to a reasonable level.

Do they make the
also required 'less than 10 foot' connection to a common earthing
electrode?

The concern is not distance to common electrode but distance from phone,
cable entry protector to the earthing wire at the power service.
Francois Martzloff, who was the NIST guru on surges and wrote the NIST
guide, has written "the impedance of the grounding system to `true
earth' is far less important than the integrity of the bonding of the
various parts of the grounding system."

The IEEE guide says:
"If the cable, 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."

Will a protector or UPS absorb that energy
that 3 miles of sky could not stop? Of course not. Only place that
surge energy gets harmlessly dissipated is in earth.

w_ has a religious belief (immune from challenge) that surge protection
must use earthing. Thus in his view plug-in suppressors (which are not
well earthed) can not possibly work. The IEEE guide explains plug-in
suppressors work by CLAMPING the voltage on all wires (signal and power)
to the common ground at the suppressor. Plug-in suppressors do not work
primarily by earthing (or stopping or absorbing). The guide explains
earthing occurs elsewhere. (Read the guide starting pdf page 40).


Install only one 'whole house' protector on AC mains with that
short connection to earth.

Service panel suppressors are a good idea. What does the NIST guide say?
"Q - Will a surge protector installed at the service entrance be
sufficient for the whole house?
A - There are two answers to than question: Yes for one-link appliances,
No for two-link appliances [equipment connected to power AND phone or
cable or....]. Since most homes today have some kind of two-link
appliances, the prudent answer to the question would be NO - but that
does not mean that a surge protector installed at the service entrance
is useless."

Where is
each type of surge defined AND numbers for that protection?

Complete nonsense. Plug-in suppressors have MOVs from H-G, N-G, H-N.
That is all possible combinations and all possible surge modes.


Any wire that is not earthed (by direct connection or protector)
where it enters the building means no effective protection.

The required statement of religious belief in earthing.
Everyone is in favor of earthing. The only question is whether plug-in
suppressors work. Both the IEEE and NIST guides say plug-in suppressors
are effective. Read the sources.

There are 98,615,938 other web sites, including 13,843,032 by lunatics,
and w_ can't find another lunatic that says plug-in suppressors are NOT
effective. All you have is w_'s opinions based on his religious belief
in earthing.

w_ has never answered:
- Why do the only 2 examples of protection in the IEEE guide use plug-in
suppressors?
- Why does the NIST guide says plug-in suppressors are "the easiest
solution"?

–
bud--