The safety ground was only one point I mentioned.
I also pointed out that I am well aware of the need for earth ground and
am working on improving the existing earth ground. Satellite tv and
electric were done properly by the utilities. Ham radio is done properly
by me. Phone is done improperly and will be addressed.
On 7/22/2010 4:51 PM, westom wrote:
On Jul 22, 2:03 pm, Doug Brown<[email protected]> wrote:
Clearly one of the issues is the age of the house and utilities not
bringing their ground systems up to spec. The house was built in 1960
and has 2 prong wiring; that responsibility is on me but unless I win
the lottery I can't afford to rewire the house right now.
Safety ground is irrelevant to earth ground. Wiring from 2000 or
1930 can permit the same damage IF 'earth ground' is not properly
installed.
Both of Bud's citations make that point. For example, Figure 8 on
page 47 of:
http://www.google.com/url?sa=D&q=http://www.mikeholt.com/files/PDF/&usg=AFQjCNG5OJq2ORRcXRpJ_XI4a0wvLpB_Rg
A plug-in protector has no earth ground. So it earths energy
destructively via an adjacent TV. 8000 volts destructively. Every
responsible source says this. Either energy dissipates harmlessly
outside the building. Or that energy is inside (ie at a plug-in
protector) hunting for earth destructively via appliances. 8000
volts destructively through an adjacent TV because energy was not
earthed where wires enter the building. A protector was too far from
earth ground and too close to electronics.
Bud's NIST citation says the same thing:
A very important point to keep in mind is that your surge protector will work
by diverting the surge
to ground. The best surge protection in the world can be useless if grounding
is not done
properly.
Either a protector connects short (ie 'less than 10 feet') to single
point earth ground. Or "the best surge protection ins the world can
be useless". Plug-in protector numeric specs confirm this. No plug-
in protector numeric spec claims protection. It is a profit center -
not surge protection. If it discussed earth ground, then you would
learn how "useless" it really is. "Useless" is not my description.
"Useless" is what the NIST says..
Bud's job is to promote plug-in protectors. So he will say anything
to avoid critical facts that even the ARRL is blunt about.
Protection is always about where energy dissipates. Not wall
recoupable safety ground. Earth ground.
Bud claims that energy just magically disappears. Professionals say
that energy must be connected short (low impedance) to single point
earth ground. As demonstrated by another professional's application
note:
http://www.erico.com/public/library/fep/technotes/tncr002.pdf
Even underground wires must connect to single point ground before
entering the building.
Connect to earth via a wire (cable TV, satellite dish). Or
connected to earth via a 'whole house' protector (telephone, AC
electric). A connection that must be short. And other critically
important factors such as no sharp wire bends and not inside metallic
conduit. Plug-in protectors, without that always required earthing
connection, make no protection claims in numeric specs.
All phones have a 'whole house' protector typically where their
wires meet yours (ie NID). But again, that protector is only as
effective as the earth ground that only a homeowner is responsible for
providing. One utility demonstrates how to kludge a solution if
existing utilities do not properly enter at the service entrance:
http://www.duke-energy.com/indiana-business/products/power-quality/tech-tip-08.asp
ARRL makes the same point found in Polyphaser application notes and
Sun Microsystems Planning Guides. Solutions required in Air Forces
bases, telco switching centers, munitions dumps, commercial
broadcasting center, etc. In every case, the solution to averting
surge damage is to install or upgrade the earthing - where energy
dissipates.
Orange County FL 911 emergency response centers had surge damage.
No plug-in protectors were installed. They simply fixed the only
reasons for surge damage - defective earthing:
http://www.psihq.com/AllCopper.htm
A broadcast station installed Ufer grounding so that direct
lightning strikes would not cause damage:
http://scott-inc.com/html/ufer.htm
A Nebraska radio station suffered repeat damage until someone
finally fixed the only reason for that damage: defective earthing. A
case study at:
http://www.copper.org/applications/electrical/pq/casestudy/nebraska.html
. Any wire that enters the building must connect short (directly or
via a protector) to single point earth ground. The solution from over
100 years ago is still the only useful solution today. No plug-in
protector does that. No plug-in protector claims effective protection
the only place they cannot lie - numeric specs. In every case,
protection means upgrading earth so that protectors make a short
('less than 10 foot') low impedance connection to that single point
ground.
Safety ground (what code calls equipment ground) is completely
irrelevant to effective surge protection. No interior wiring is
upgraded. The protection is just as good on 1930 homes as on 2010
homes. The other ground - earth ground - is required for effective
protection. A protector is only as effective as its earth ground.
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.441 / Virus Database: 271.1.1/3021 - Release Date: 07/22/10
06:36:00
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Doug Brown/ KC4RSL
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