|
|
|
|
|
BASIC DESIGN CONSIDERATIONS EFFECTIVENESS: When considering the design of the electric fence, look 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 more effective 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 a 2 meter electric fence is more effective than a 6-8 meter high wall and never sleeps and can provide alarm 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 and local government ordinance that is available for review, require warning signs. The average spacing is approximately every 10 meters or less. The government unit requires warning signs from a liability perspective, but it has been shown that these signs, by themselves, 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. 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 they 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 high voltage pulse technology is what makes it both painful and still 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) ranging up to 0.0003 seconds. If you were to use house voltage on the fence, the fence now becomes potentially LETHAL ! If you were to hold your arm over a burning candle for few 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 of not more than 2 pulses per second. Using 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 and are fairly standard with most modern "approved" fence chargers/energizers. 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. (For Security Installations)
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 even number of charged wires to provide a loop so that the entire fence will be monitored. Alternate wires should be connected to earth ground. 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 which may fall or be blown across the fence. 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
Home - Sensor Specs - Components - Ordering - Design Solutions - About NECAD - About IFS - Contact Us
©1996 - 2006-2011
|
