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w_tom wrote:
IEEE and NIST 'introduce' various types of protectors.
NIST / IEEE does not recommend as Bud assumes. Those papers define
various protector methods.
IEEE guide - chapter 6 provides examples protection using surge suppressors.
"SPECIFIC PROTECTION EXAMPLES
"The previous sections have shown, in general, how to protect electronic
systems in houses:
"1) Proper grounding and bonding, especially at the service entrance.
"2) AC panel and primary signal surge protection at or near the service
entrance.
"3) Multi-port plug-in protectors near the equipment to be protected."
#3 explicitly recognizes plug-in surge suppressors as effective. As is
clearly described, these devices work primarily by clamping all wires to
a common ground at the surge suppressor.
Why do both examples of surge protection in this chapter use multi-port
plug-in surge suppressors??
If you have trouble figuring out the text look at the nice pictures of
multi-port plug-in surge suppressors.
----------------------
NIST guide
page 12 discussing protection of 2-port equipment:
"A simple solution to the problems of voltage differences for two-link
appliances is to install a special surge protector that incorporates, in
the same package, a combination fo input/output connections for the two
systems. Each link, power and communications, is fed through the
protector which is then inserted between the wall receptacles and the
input of the appliance [electronic device] to be protected. This type of
surge protector is readily available in computer and electronics stores,
and the electrical section of home building stores."
If you have trouble figuring out the text look at the nice pictures of
multi-port plug-in surge suppressors.
page 16 - questions and answers:
"Q - Will a surge suppressor installed at the service entrance be
sufficient for the whole house?
"A - There are two answers to that question: Yes for one-link appliances
[electronic devices], No for two-link appliances. 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. ...."
Page 17 - surge suppressor installation hints:
"Plug-in (with cord or directly into receptacle)
The easiest of all for anyone to do. The only question is "Which to choose?"
-------------
Another paper writen by Martzloff, the NIST guru on surges, describes
surge reference equalizers.
"CONCLUSIONS
"The rapid expansion of smart electronics involving power and
communications connections creates the potential for disappointing
performance under surge conditions if adequate, coordinated protection
is not provided. Separate, uncoordinated surge protection of each of the
two ports still leaves the possibility of damage or upset.
"A new type of device, the 'Surge Reference Equalizer', offers a
solution to the problem, provided that the performance characteristics
of the device will be coordinated with the environmental stress and with
other surge-protective devices that may be installed on the
systems."
-----------------------------
It takes willfull stupidity to claim the IEEE guide, the NIST guide, and
Martzloff do not say plug-in protectors are effective.
They are called shunt mode protectors. They are effective when they
shunt the surge into earth. So plug-in protector manufacturers don't
discuss earthing.
They do not operate primarily in shunt mode. The IEEE guide clearly
describes, to anyone who can read and think, the action as clamping
wires to a common ground at the plug-in surge suppressors. Your
reading/thinking disability is unfortunate.
The IEEE and NIST guides clearly say plug-in surge suppressors are
effective.
And you have never provided a link to a reputble source that says
plug-in suppressors are not effective. It is you against the world.
bud--
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