วันจันทร์ที่ 9 พฤศจิกายน พ.ศ. 2552
Key Information On Circuit Breakers
<p>A circuit breaker is an electrical device used to automatically break open an electrical circuit when it becomes overloaded. This is a safety precaution that can save a home or building from having a major fire or electrical disaster. <p> To determine the ideal breaker, you have to consider the type of voltage you are using, the trip point, and the overload protection. These are important factors for the safety of your home and family. <p> There are different types of voltage breakers; the low voltage circuit breaker is the most common type, which is used in homes. Low voltage breakers are the easiest way to install, since you only have to install them on breaker panels. <p> Miniature circuit breakers or MCBs use the lowest low voltage. It is known to carry electricity of not more than 100 amps; MCBs are also capable of holding electric charges of not more than 1,000 amps. Next to MCBs, are the Molded Case Circuit Breakers or MCCBs. <p> MCCBs are ideal for 1,000 amps and can safely disconnect from electricity that goes beyond ten times its capacity. They are also called a magnetic circuit breaker, because they use an electromagnetic power solenoid to break the circuit when there is too much electricity flowing through it. <p> Medium Voltage Circuit Breakers are the next type. Its capacity is to hold amps that can reach between 1,000 and 72,000 before they break. Their performance is relative to the model and brand. Westinghouse breakers are known for its quality of performance. <p> Medium Breakers are found in large buildings and businesses, and are enclosed in switchboxes or indoor cabinets. Under this type of breaker are three sub-types, vacuum, air, and SF6 breakers. <p> The vacuum breakers can maintain a power arc in a vacuum by letting air back into the breaker when it is tripped. An air Circuit breaker is equipped with two spring loaded contacts close together in an air-enclosed environment, when the breaker is tripped; the spring snaps open and pushes the contacts away from one another. <p> SF6 breakers have an arc produced in a chamber of sulfur hexafluoride gas, which reacts to the presence of higher than a regular voltage. It increases in density to stop the arc. <p> The high voltage breakers are the ones that are capable of holding more than 72,500 volts of electricity. They are found outdoors in a chain-link enclosure together with high voltage power lines. They are operated by solenoid switch which activates the fill the arc-chamber, when too much power flows through them. <p> The trip point is the second consideration in choosing the ideal circuit breaker. The point at which the breaker will trip can be set at low, medium or high sensitivity to prevent your wiring from heating. <p> Breaker overload protection is critical. Westinghouse breakers have overload protection that are similar to hydraulic and earth leakage breakers, providing custom protection. This type of circuit breaker senses ground faults and excessive flow of electricity. <p> We at http://www.relectric.com have the circuit breakers you need. Choose from the best brands and the right price. Choose transfer switches or transformers if you need them. We carry switches & disconnects, and switchgears. Visit <a href="http://www.relectric.com/Circuit-Breakers">Power transfer switch</a> to discover the land of circuit breakers. <p> <p></p>
The History of the Shamwari Game Reserve
Located in the South Eastern Cape Area and home to all of the 'Big Five' game animals, the Shamwari Game Reserve is one of the most significant wildlife centres in South Africa. Yet it wasn't always so – less than thirty years ago, the native wildlife was almost entirely eradicated. The story of the Shamwari Game Reserve is one of the most inspiring in modern conservation – the story of a rich and unique ecosystem that was brought to the brink of destruction by human interference, then restored by dedicated conservation.
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<br>History Of The Reserve
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<br>By the middle of the 20th century, the area that is now known as the Shamwari Game Reserve had been stripped of most of its significant wildlife. The Black Rhino, the Cape Lion and the Cape Buffalo were all hunted to extinction in the area, and the once numerous elephants had been reduced to just a handful of the creatures. The land itself, which used to be fertile, diverse, and home to numerous kinds of flora and fauna, had been devastated by years of intensive farming.
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<br>In 1990, businessman Adrian Gardiner bought a piece of farmland in the reserve to act as a holiday home. He researched and discovered the past history of the area, and soon became determined to restore the area to its former glory.
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<br>Beginning with just over a thousand hectares of land (the Reserve now stretches over 25,000 hectares) and seven professional staff (there are now over three hundred), Gardiner, working in close co-operation with leading conservationists, embarked on a carefully planned and highly ambitious attempt to re-establish the ecosystems that had been so carelessly destroyed.
<br>
<br>Over the years, through careful and determined work, the area has once again became one of the most ecologically rich and diverse parts of South Africa. A hugely significant moment came in the year 2000, when the reserve became sufficiently well stocked to reintroduce large predators, including lions.
<br>
<br>Shamwari Game Reserve Today
<br>
<br>Although so much has been achieved in a relatively short space of time, the work on the Shamwari Game Reserve is far from over. With the reserve only being a few decades old, conservation is still an active and ongoing process, and the area remains fragile. A large professional team continue to monitor and develop the ecosystems and wildlife populations in the reserve.
<br>
<br>In order to fund the conservation, the Shamwari Game Reserve has developed a commercial aspect, with a number of luxury lodges open to visitors and numerous safari programs offered by the owners of the reserve. Visitors can also get more practically involved – alongside the professional contingent, volunteer conservationists are always welcomed, taking part in placements that may be for just a few weeks or may stretch on for several months, helping out with every aspect of running the Shamwari Game Reserve.
<br>
<br>Today, whether as a visiting tourist or a volunteer conservationist, everyone is able to experience the beauty of Shamwari Game Reserve and to help secure its future.
<br>
<br>About the Author: Mark Bottell is the General Manager for Worldwide Experience, an online tour operator offering extended breaks working with animals at <a href= "http://www.worldwideexperience.com/gap_year_projects/shamwari.htm" rel="nofollow"> Shamwari Game Reserve </a> and other projects in and around South Africa including gap years for grown-ups
<br>
<br>
<br>History Of The Reserve
<br>
<br>By the middle of the 20th century, the area that is now known as the Shamwari Game Reserve had been stripped of most of its significant wildlife. The Black Rhino, the Cape Lion and the Cape Buffalo were all hunted to extinction in the area, and the once numerous elephants had been reduced to just a handful of the creatures. The land itself, which used to be fertile, diverse, and home to numerous kinds of flora and fauna, had been devastated by years of intensive farming.
<br>
<br>In 1990, businessman Adrian Gardiner bought a piece of farmland in the reserve to act as a holiday home. He researched and discovered the past history of the area, and soon became determined to restore the area to its former glory.
<br>
<br>Beginning with just over a thousand hectares of land (the Reserve now stretches over 25,000 hectares) and seven professional staff (there are now over three hundred), Gardiner, working in close co-operation with leading conservationists, embarked on a carefully planned and highly ambitious attempt to re-establish the ecosystems that had been so carelessly destroyed.
<br>
<br>Over the years, through careful and determined work, the area has once again became one of the most ecologically rich and diverse parts of South Africa. A hugely significant moment came in the year 2000, when the reserve became sufficiently well stocked to reintroduce large predators, including lions.
<br>
<br>Shamwari Game Reserve Today
<br>
<br>Although so much has been achieved in a relatively short space of time, the work on the Shamwari Game Reserve is far from over. With the reserve only being a few decades old, conservation is still an active and ongoing process, and the area remains fragile. A large professional team continue to monitor and develop the ecosystems and wildlife populations in the reserve.
<br>
<br>In order to fund the conservation, the Shamwari Game Reserve has developed a commercial aspect, with a number of luxury lodges open to visitors and numerous safari programs offered by the owners of the reserve. Visitors can also get more practically involved – alongside the professional contingent, volunteer conservationists are always welcomed, taking part in placements that may be for just a few weeks or may stretch on for several months, helping out with every aspect of running the Shamwari Game Reserve.
<br>
<br>Today, whether as a visiting tourist or a volunteer conservationist, everyone is able to experience the beauty of Shamwari Game Reserve and to help secure its future.
<br>
<br>About the Author: Mark Bottell is the General Manager for Worldwide Experience, an online tour operator offering extended breaks working with animals at <a href= "http://www.worldwideexperience.com/gap_year_projects/shamwari.htm" rel="nofollow"> Shamwari Game Reserve </a> and other projects in and around South Africa including gap years for grown-ups
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