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Guidance for Purchase of Bus Bar & Bus Duct 2013-11-01

Electrical bas bar is a conducting bar that serves as an interconnection between several electric circuits or power-handling devices. It is a kind of large-size cable carrying heavier currents, characterized by advantages of easy installation and disassembly, convenient maintenance, high safety performance, and strong adaptability. With the increase of the voltage and current in electric transmission, bus bar has become the first choice among various transmission equipments especially those in high-rise buildings and industrial premises.
Classification of Bus Bar
According to the voltage the bus bar can withstand, there are four major types, namely, rigid bus bar fit for any voltage, strain bus bar for high voltage, insulated-phase bus bar for medium voltage and sulfur hexafluoride-insulated bus bar for medium and high voltage.
Moreover, another classification criterion is the material used, copper and aluminum. Copper bus bar advantages over aluminum one in its better conductivity, mechanical strength, corrosion resistance and lower resistivity. However, with the increase of the copper price, the production cost of copper bus bar manufacturers rises correspondingly. Thus, there are many aluminum suppliers who have overcome the technical disadvantages of aluminum bus bar by coating it with zinc or magnesium to improve its performance.         
Classification of Bus Duct
Bus duct is the carrier of bus bars which can be classified into four categories in terms of different using occasions, that is, alternating-current, direct-current, fire-resistant and waterproof bus bar, among which the alternating-current bus duct still takes a leading place. Besides, based on different insulation modes, there are two kinds of bus duct, air-type insulated bus duct (BMC) and intensive insulated bus duct (CMC). BMC, insulated by air, is known for its simple processing and low insulating requirement, but fails in its current-carrying capacity, temperature rise, resistant value and heat dissipation. CMC, covered with insulating material, overcomes all the shortcomings of BMC, yet the processing is quite complex and the demand for insulating technology is relatively high.
Tips on Right Purchase of Bus Duct
For the choice of proper bus bar, two most important factors should be taken into consideration, the current-carrying capacity and the adaptability to different occasions. Regarding the difference between BMC and CMC, it is suggested that CMC is the first choice at places of heavy current such as trunk lines and feeding parts, while BMC is more suitable for circuits with various current branches and lower current rating. Specifically, when the rated current is above 1250A, it is better to choose CMC to ensure the performance and safety, and when less than 1250A, BMC is more proper in order to save the cost.    
In addition, users need also make sure the type and protection grade of the bas duct in accordance with the different using occasions.  
After we have chosen the bus duct type, there comes to the choice of right suppliers. It is wise for users to do some market research in advance through local investigation. Meanwhile, searching online is also a good way to reduce the cost on the premise of same quality. Some Asian countries like China are big bus duct suppliers around the world. Before you make a deal, you'd better figure out the best production area in each country. For example, in China, Jiangsu Province is the hometown of bus bar and duct production with many top-notch manufacturers gathering there such as Suzhou Huatong and Nantong Weiteng. Only by comparison shopping will you find the best one with most reasonable price.