Otis Singleton
Electric fences emit pulses of high voltage at fixed time intervals, typically once every 1 to 2 seconds. The voltage of these pulses usually ranges from 2000 to 7000 volts, with a maximum of 10,000 volts. The pulse frequency can be adjusted on some electric fences, allowing users to choose between fast, medium, or slow settings. These pulses are designed to deter animals and humans from crossing boundaries by delivering electric shocks. The intensity of the shock depends on various factors, including the voltage, energy of the pulse, degree of contact, and route of the current through the body. While electric fences are commonly used for agricultural and livestock control, they can also be employed for security purposes, with the potential to cause uncomfortable, painful, or even lethal shocks.
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What You'll Learn
- Electric pulses are sent down the fence wire about once every second
- The voltage of electric pulses ranges from 2,000 to 10,000 volts
- Pulses are very brief, lasting less than 3/10,000 of a second
- The pulse is powerful enough to deter animals but not long enough to cause fires
- The pulse's voltage and energy, degree of contact, and route through the body determine the shock's effect
Electric pulses are sent down the fence wire about once every second
The timing of these pulses can vary depending on the brand and model of the energiser. Some energisers may send pulses every 1.5 seconds, while others may have adjustable settings for fast, medium, or slow pulse timing. The frequency of pulses can also depend on the power source, with battery-powered energisers spacing out pulses to conserve battery power.
The effectiveness of the electric fence can be influenced by various factors, including the type of conductor or wire used. For example, Class III high-tensile smooth wires have low resistance, allowing the pulse to flow down easily. In contrast, certain poliwire products have higher resistance, resulting in reduced voltage over longer distances. Additionally, the length of the fence is a consideration, as longer fences may require more powerful pulses to maintain their effectiveness.
Environmental factors, such as soil type and moisture conditions, also play a role in the efficiency of the electric fence. Dry, sandy, or rocky soil increases resistance, leading to a weaker pulse that may not deter animals. Similarly, vegetation load on the fence, such as weeds or grass, can impact the voltage and the effectiveness of the shock delivered. Therefore, it is crucial to consider these factors when designing and maintaining an electric fence system to ensure its optimal performance.
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The voltage of electric pulses ranges from 2,000 to 10,000 volts
Electric fences use brief, high-voltage pulses to deter animals or people from crossing a boundary. The voltage of these electric pulses ranges from 2,000 to 10,000 volts, with a frequency of 1 Hz (one pulse per second). The electric pulse is generated by a component called a power energiser, which converts power into a brief, high-voltage pulse. The voltage and energy of the pulse, as well as the degree of contact and the route of the current through the body, determine the effects of the shock, which can range from barely noticeable to lethal.
The voltage of electric pulses in an electric fence depends on various factors, including the type of livestock, the length of the fence, the soil type, and the type of conductor or wire used. For example, goats require a higher voltage, and arid conditions may require a different voltage than wet ground conditions. The rule of thumb is that one output joule will power around 3 miles of average agricultural fence.
The type of conductor or wire also affects the voltage. Class III hi-tensile 12.5 gauge smooth wires have little resistance, allowing the pulse to flow easily, while some types of poliwire products have higher resistance, reducing the voltage over longer distances. The quality of connections, the type of fencing wire, and the insulation of the live wire from conductive materials can also lead to voltage leaks, reducing the voltage that reaches the end of the fence.
Electric fence energisers typically have an output voltage of around 7,000 volts, with the voltage rarely exceeding 10,000 volts. These energisers push brief, high-voltage pulses of electrons down the conductor every 1 to 2 seconds, with the pulse duration being less than 3/10,000 of a second. This is powerful enough to deter animals and poultry, but the brief and infrequent pulses do not pose a fire risk, even with combustible materials nearby.
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Pulses are very brief, lasting less than 3/10,000 of a second
Electric fences use brief, high-voltage pulses to deter animals, people, or intruders from crossing a boundary. The duration of these pulses is very brief, typically lasting less than 3/10,000 of a second, or about 10 microseconds. This extremely short duration ensures that the pulses are not only effective in delivering a shock but also contribute to the safety of the fence system.
The brief duration of the pulses is a significant improvement over early alternating current (AC) fence chargers, which used wide pulses with unpredictable voltages. The rapid drop in voltage as fence leakage increased led to the decline in popularity of "weed burner" fence chargers, which were responsible for many grass fires during dry weather.
Modern electric fence energizers, also known as "chargers" or "fencers", have addressed this issue by employing solid-state circuits or capacitors to control the pulse width and voltage. The result is a much narrower pulse width, typically lasting just a few microseconds, which is not only effective in delivering a shock but also significantly reduces the risk of fires, even when the conductor is near combustible material.
The brief duration of the pulses, combined with their infrequency (usually sent every 1-2 seconds), makes it almost impossible for heat to build up and cause ignition. This safety feature is crucial, especially in dry conditions or when the fence is near flammable objects.
Additionally, the brief pulses have other advantages, such as being powerful enough to deter animals and poultry without causing harm. The electric fence serves as a pain barrier, conditioning the animals to associate it with an unpleasant sensation and avoiding it even when inactive. This conditioning effect is particularly useful for controlling the movement of wild animals and preventing them from crossing boundaries.
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The pulse is powerful enough to deter animals but not long enough to cause fires
Electric fences are designed to emit a powerful enough pulse to deter animals, but not so powerful as to cause fires. The voltage of the shock can range from uncomfortable to lethal, but modern electric fences are designed with a low-impedance pulse of shorter duration and faster travel speed, which is safer for both animals and the surrounding environment.
The pulse is generated by a device called a power energiser, which converts power into a brief high-voltage pulse. The pulse is then released along a connected bare wire about once per second. The frequency of the pulse can vary depending on the brand and model of the energiser, with some offering adjustable timing options. The voltage of these pulses typically ranges from 2,000 to 7,000 volts, with a maximum of 10,000 volts.
The effectiveness of the shock depends on various factors, including the voltage, energy of the pulse, degree of contact with the fence, and the route of the current through the body. Different types of livestock require different voltages, with some, such as goats, needing higher voltages. The length of the hair or wool coat can also affect the power needed to penetrate the coat. Additionally, soil types and moisture levels can impact the resistance of the circuit, with dry, sandy, or rocky soil increasing resistance and reducing the effectiveness of the pulse.
To overcome high resistance in the soil, additional measures can be taken, such as using multiple ground rods, a Positive/Negative fence, or a higher-output energiser. By ensuring that the circuit is complete and the pulse is strong enough, the electric fence can effectively deter animals without causing fires or other safety hazards. The brief duration of the pulse and the infrequency of the pulses make it highly unlikely for heat to build up and cause ignition, even near combustible materials.
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The pulse's voltage and energy, degree of contact, and route through the body determine the shock's effect
Electric fences work by sending high-voltage electric pulses through the fence wires. The voltage of electricity flowing through an electric fence can be over 10,000 volts, with rapid drops in voltage as fence leakage increases. The pulse flows along the length of the wire about once a second. If an animal or human touches the fence, they will receive a shock as they complete the electrical circuit.
The effects of the shock depend on several factors, including the voltage and energy of the pulse, the degree of contact with the fence, and the route the electricity takes through the body.
The voltage and energy of the pulse play a significant role in determining the severity of the shock. High-voltage currents of 500 volts or more can cause deep burns, while low-voltage currents of 110 to 120 volts can result in muscle spasms. The energy of the pulse is also important, with a higher energy pulse causing a more intense shock.
The degree of contact with the fence also affects the shock's impact. This includes the area of contact between the fence wire and the skin, as well as whether the skin or wire is wet. A larger area of contact can increase the severity of the shock, and wet skin or wires can conduct electricity more effectively, potentially intensifying the shock.
The route the electricity takes through the body is another critical factor. If the electricity passes through vital organs or sensitive areas, the impact can be more severe. Additionally, if the person or animal is also in contact with the ground, the electricity will preferentially travel through the body, increasing the intensity of the shock.
In summary, the voltage and energy of the pulse, the degree of contact with the fence, and the route the electricity takes through the body all play a role in determining the effects of an electric fence shock. While electric fences are designed to be a deterrent rather than a physical barrier, it is important to recognize that all electric shocks can result in injuries, and high-voltage shocks can even be lethal.
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Frequently asked questions
Electric fences usually emit a pulse about once every second, but this can vary depending on the brand and model of the fencer. Some modern electric fences emit pulses at a fixed time interval, while others use a voltage multiplier to store a high voltage that is applied continuously to the fence.
The voltage of electric fence pulses typically ranges from 2,000 to 7,000 volts, but can go up to 10,000 volts. The voltage required depends on factors such as the type of livestock, the length of the fence, and the soil conditions.
Electric fences use a component called a power energizer to convert power into brief, high-voltage pulses. These pulses are emitted through a wire in the fence, creating an electric shock when an animal or person completes the circuit by touching the wire and the ground during a pulse.
The effectiveness of electric fence pulses can be influenced by the type of conductor or wire used, the vegetation load on the fence, and the soil conditions. Dry, sandy, or rocky soil can increase resistance and weaken the pulse.
While modern electric fence pulses are brief and infrequent enough to pose minimal fire risk, early alternating current (AC) fence chargers with unpredictable voltages were responsible for many grass fires. It is important to consider factors like soil moisture, vegetation, and nearby combustible materials when installing an electric fence.
