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How
to design an effective Electric Security Fence.
-
General
Description and Information
-
Basic
Design Considerations
-
Specific
Design Solutions
-
Psychological
Impact
-
Liability
Requirements and Troubleshooting
BASIC
DESIGN CONSIDERATIONS
EFFECTIVENESS:
When considering the design of the electric security fence, look around
at what is already being used. The coiled barbed wire and barbed wire strands
that top off most fences are meant to look hurtful and difficult to get over and
around. Also the broken glass that is embedded on the top of many walls needs to
be plainly visible to be truly effective, and works because it is visible and
makes it more difficult for a trespasser to scale the wall, so that hopefully
the trespasser will bypass this property and pick another house or property to
break into, where it is easier to gain access.
A wall or fence is just a device that defines your
property line, and sometimes provides some privacy. Any wall or fence can be
easily scaled. And if you make the walls higher, the intruder uses a pole or
ladder or tree and climbs over. There are many ways that even a very high wall
can be scaled and breached.
Dogs are one of the better methods that will provide an
alarm. However if the dog is tied or caged, then it is only able to provide
noise, which is effective only if someone is there to hear the barking. Dogs can
be poisoned; require care, feeding and sleep. In contrast, an electric security
fence deters someone from even trying to trespass and is actually more effective
than a 15 meter high wall and never sleeps and can provide noise if tampered
with.
When a thief or trespasser picks a house or property
to rob, they will invariably pick a target that is easy to gain access to, and
they will pick a target that offers the least risk and exposure to themselves. A
well
designed electric security fence
will virtually eliminate all petty theft
and trespassers. They won’t even try to gain access.
NOTE:
The primary object of an electric security fence is NOT to shock the
intruder or trespasser in the process of scaling your fence or wall, but to
persuade the intruder that it is not worth the trouble to try to get onto your
property in the first place. Let the thief go to another house that is an easier
target for him.
Stop the intruder from trying to trespass onto your property
before he even attempts. If he suspects that your fence is a bluff, a very few
might touch the charged wires and the resultant shock will completely convince
them otherwise. Even if the trespasser suspects that the voltage is
“non-lethal” he will not be sure, and he will be quick to try a different
property. This is why “the lethal look” of the fence is just as, and even
more important than the fact that the fence is actually charged. People are
scared of electricity. People can’t see electricity. If people perceive that
the fence is dangerous, then it becomes effective.
Every municipal ordinance that is available for
review, require warning signs spaced approximately every 10 meters or less. The
municipal requires “warning signs” from a liability perspective, but it has
been shown that these signs, by them selves, are as effective as the fence
itself in keeping out trespassers even when, or if the fence is turned off. When
you have a “lethal looking” fence combined with “warning signs”, the
fence now becomes almost totally effective is stopping passage through or over
the fence. (NOTE: there is absolutely NO device or method devised that has
proven to be 100% effective)
The “warning signs”
take a lightly designed
fence and transform it into a “most lethal looking” fence. Keep in mind that
the electric fence is completely non-lethal and not dangerous to the smallest
most vulnerable animal. When shocked repeatedly, new born baby rabbits are not
harmed. The fence will administer a stinging and most unpleasant feeling shock,
but will not physically harm an animal, child, or adult. So you need to
understand, that the fence is an elaborate bluff, that will slap their wrist
hard if someone chooses to ignore it.
Because of the “non-lethal” action of the
electric fence, the legal liability exposure is very small, however, warning
signs about every 10 meters or so, in plain sight, as close to eye level as
possible, minimize the legal liability exposure to almost nothing.
If you were to plug your fence into the wall
outlet/receptacle then you might indeed kill somebody. Your liability exposure
is extreme. Your insurance will NOT cover you. Wall voltage is not only
dangerous, but mostly not effective. At 220 volts, dry cement, and rubber
slippers will insulate you from a shock, however, if someone accidentally comes
in contact with an electrical ground you may easily be killed.
Dry ground combined with insulated footwear is why
10,000 volts is used, so as to carry the shock through the ground and the
footwear. The “pulse” technology is what makes it both painful and
non-lethal. This technology has been tested and proven for over 75 years of
usage around the world. There are safety standards all over the world that when
met, insure that the shock is “non-lethal”. The pulse length is
approximately 100 microseconds (0.0001 seconds) If you use house voltage on the
fence, the fence now becomes potentially extremely LETHAL !
If you were to hold your arm over a
burning candle for several seconds, you would receive a nasty burn. If you were
to pass your arm through the flame of an acetylene torch (which is much hotter
than a candle) and do it quickly enough, you would escape and not even singe a
hair. That is primarily the safety principle with pulsed electricity charging
electric fences. The safety standards
mandate the maximum voltage (not to exceed
10,000 volts) and the maximum pulse length (not to exceed 300 microseconds) of
the pulse and the repetition rate (not less than ½ second) of the pulse. We use
a fence charger that peaks out at about 9,500 volts and has a pulse length of
approximately 100 microseconds and repeats approximately once per second which
are all well within the safety standards that have been set and tested
accordingly.
Back to top
INSTALLING
THE FENCE WIRES:
The
12 Volt DC fence charger, battery, and battery charger is recommended to be
mounted indoors and out of view from intruders, thus concealing the location of
the power source of the electrically energized fence.
click on picture for more detail
All
wires
including the ground return wires and the high voltage wires are to be installed
and mounted on insulators. This is necessary to complete the psychological
component and so the trespasser cannot
distinguished the ground wires from the high voltage wires.
The maximum spacing between the wires
should be approximately 6 inches or about 15 centimeters. This has been tested
and shown to be the most effective spacing to deter people from trying to go
over or through the fence.
The
fence should be designed and installed with an odd number of wires, with both
the top-most wire and the bottom-most wire being high voltage wires.
However,
when there is an excessive amount of foliage around the fence, the top wire
might be a ground wire. This is to reduce the number of faults when the high
voltage wire is partially shorted with fronds or banana leaves.
Various
shapes and angles are designed
into the fence which depend on the type of fence desired, keeping in
mind, both the aesthetic concerns, as well as the security concern
Back
to top
-
General
Description and Installation
-
Basic
Design Considerations
-
Specific
Design Solutions
-
Psychological
Impact
-
Liability
Requirements and Troubleshooting
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Mandaue City, Cebu Philippines
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