Yo-yos are easily separated from industry professionals.
Yo-yos post claims without numbers, supporting facts, and
experimental evidence (examples). IOW they post junk
science. Junk scientists especially fear to provide numbers.
Why? Numbers identify myth purveyors from the educated. To
promote myths, one must not provide numbers that can be
challenged.
For example, others may recommend an APC power strip
protector. They claim it will block or stop surges? So how
does a transient that was not stopped by 3 miles of air get
stopped by a one inch part? More damning numbers. The
manufacturer's own specifications also make that obvious.
Therefore yo-yos avoid saying what the plug-in protector even
does. They don't cite joules (a number). They don't cite the
manufacturer's specifications. They don't have any idea how
its internal components (MOVs) operate. Some are so foolishly
deceived into thinking MOVs vaporize (fail catastrophically)
to provide protection. They don't even know the so called
protected appliance still connects directly to AC mains -
nothing between the appliance and wall receptacle wire. They
claim a ground light is reporting the existence of an earth
ground. They claim the OK light reports the protector as
fully functional.
So that yo-yos are not exposed, they don't provide any
supporting facts and numbers. Notice why my every post is so
long? Numerous supporting facts, electrical principles,
numbers, and examples are also provided.
Its a classic lesson from propaganda experts. Declare the
other as wrong AND say no more. The naive among us will then
believe the shortest post that only says, "wrong" rather than
the longer post that provides supporting reasons why. Some
people will always believe a sound byte and deny even
principles taught in high school science.
Numerous responsible industry professionals were cited in
that discussion. Everything from Sun Microsystem's Server
Installation manual, National Electrical Code, and even peer
reviewed IEEE papers. The benchmark in protection is
Polyphaser. Their application notes are legendary. And if
that were not enough, visit a newsgroup where lightning is
a most serious problem - where direct lightning strikes are
routinely earthed without damage:
rec.radio.amateur.antenna
Those with technical knowledge will appreciate the
underlying concepts, solutions, and personal experience
provided by posters such as Richard Harrison and Jack
Painter. Principles that were even demonstrated by Ben
Franklin in 1752. Yo-yos, however, will only make
declarations; never provide critical supporting facts,
principles, numbers, and real world experience.
Ironic that TimPerry would say DC triangle waves are not
confusing since that is not what he said on 11 Jun 2005 in the
newsgroup sci.electronics.basics entitled "DC Wave
Questions":
There are a number of waveforms that go in only one
direction relative to ground such as sawtooth waves, square
waves, and triangle waves. To refer to these as say a "DC
triangle wave" would be equally confusing without further
qualification.
Meanwhile, concrete is not an insulator as TimPerry would
have us believe. Concrete is a conductor. Concrete is why
Ufer grounds are a most effective method of protecting
transistors ... or protecting munitions (the original purpose
of Ufer grounds).
TimPerry wrote:
"w_tom" wrote in message
...
http://makeashorterlink.com/?X61C23DCA
one has no way of knowing who is an "industry professional" and
who is a yoyo.
...
Equally confusing is to say "DC triangle wave"
nothing confusing about it to me. if a waveform lies above
reference ground it becomes fluctuating DC regardless of
its shape, frequency, pulse repetition rate. id just call
it a triangle wave or sawtooth or whatever. the DC part is
usully understood.
you see the electrons are all moving in one direction through
a conductor... that's what Direct Current is. when the
little suckers stop and reverse direction on a regular basis
then voila! we get Alternating Current.
DC pulse or DC triangle wave - both are oxymorons. Both
contain numerous frequency components. Therefore a
'DC pulse' cannot be analyzed using DC analysis. Lightning
requires AC analysis. Lightning is not a DC event.
shure is. next thing you know you'll be telling me that a
flashlight is AC because when you turn it on it has a fast
rise time, a finite duration, and a falling edge when you
turn it off.... one big square wave.... plus a few
harmonics... and a tiny bit of RF.
Point two. TimPerry believes a batting cage set in
concrete is not conductive.
yep that's what i believe. assuming a typical chain link fence
type arangement. granted that any insulator has a breakdown
point. i beleive that a barefoot boy leaning aginst a batting
cage in a thunderstorm is a bad thing. even a boy in wet
sneakers.
now should said cage be grounded with standard 8 foot rods at
each corner and possibly at intermediate points i might feel
differently. its just that i have never seen one treated in
such a way. (remember we are talking little league here). even
in this case i wouldnt be comfortable. a direct hit by approx
20,000 amps is not something i would care to experiance given
the choice. in any event, i personally prefer to be at home
or on a nice building during lightning storms. after the
storm has passed i then go to various locations as needed and
reset breakers, make repairs, or go to backup systems.
TimPerry should first read those discussions he refused
to learn from in:
http://makeashorterlink.com/?X61C23DCA
sorry, if i cite a reference it will be to an accredited
text, validated research paper, or at least a website from
a reasonably reputable organization or agency.
...