"w_tom" wrote in message
...
Point one. Deny citations from industry professionals by
refusing to read them. An ostrich does that; not an informed
human. Cited are numerous technical papers and other
technical facts on lightning - literally a full days worth of
reading. Instead TimPerry pretends those citations did not
exist in:
http://makeashorterlink.com/?X61C23DCA


one has no way of knowing who is an "industry professional" and who is a
yoyo.


A DC pulse is an oxymoron. As confusing as another
ridiculous term: DC triangle wave. Either it is a pulse
affected by reactance (inductors and capacitors), or it is
only DC that completely ignores reactance. One cannot have
it both ways. Either it is DC that ignores reactance, or it
is a pulse that makes reactance relevant. Which is it? If
lightning is DC, then inductance, capacitance, and impedance
is not discussed. Why do industry professionals discuss these
repeatedly? Because lightning is not DC.

Pulses are transient responses - taught in 1st year
engineering - an introduction to AC characteristics. AC
analysis makes wire inductance and capacitance significant.
DC analysis ignores inductance and capacitance. To understand
how lightning works - as cited in
http://makeashorterlink.com/?X61C23DCA - one cannot pretend
lightning is DC. A lightning impulse is an AC or transient
event. Lightning is a composition of many frequencies. Show
me a DC wave that has frequency components? You cannot. That
is the oxymoron of DC pulse. A 'pulse' has AC components.
'DC' has no AC components. Oxymoron.

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.



A most superior earth ground is an Ufer ground. Why? The
earthing is through concrete. Had TimPerry first learned what
industry professionals teach, then he would have known the
batting cage mounted in concrete makes a best earthing ground
- exactly like Ufer grounds. But then TimPerry also promotes
an oxymoron called 'DC pulse'. Somehow he knows without first
learning the facts. If only he had first read those citations
and first learned about Ufer grounding. Then he would not
have posted, "i dont think so." One should first learn before
knowing something.

The energy of lightning is AC electricity.

TimPerry wrote:
citing a newsgroup discussion is not a valid reference.

elaborate (and probably inaccurate) discussion as to the exact
nature of lightning will not be of benefit to the original poster.

a DC pulse is still a DC pulse no amount of wishful thinking will
turn it in to AC (granted that there are some aspects that generate
RF and perhaps some other characteristics that may be able to be
handled by AC analysis)

looking at a few of toms 16,900 archived posts i see he also
claims that a ground rod in rock will make a perfectly good
ground. from that it follows that a batting cage set in concrete
is adiquitly grounded. i dont think so.