Selection of busbar cross-sectional dimensions may include the following options:

Select by continuous working current.

(2) Select based on economic current density.

(3) Verify thermal stability during short-circuit conditions.

(4) Verify mechanical strength during short circuit.

Increased contact resistance further raises the temperature of the contact surface, leading to a vicious cycle and causing damage to the contacting parts. Therefore, the oxidation issue of the electrical contact surfaces becomes a major factor limiting busbar tray temperatures. Silver-plated bolt connections on the contact surfaces allow for higher busbar temperatures but at a high cost, so soldered or zinc-plated bolt connections are generally used. This type of busbar has a lower allowable temperature. In China, the allowable busbar temperature is specified as 85~90°C, and for enclosed busbars, the allowable shell temperature is 65~70°C. When welding is used, the allowable temperature can reach up to 110°C.

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With the emergence of modern engineering facilities and equipment, the electricity consumption in various industries has surged, especially with the rise of numerous high-rise buildings and large factory workshops. Traditional cables, as transmission conductors, can no longer meet the requirements in high current transmission systems. The parallel use of multiple cables has brought many inconveniences to on-site installation and construction connections. The plug-in busbar trunking has emerged as a new type of power distribution conductor. Compared to traditional cables, it fully demonstrates its advantages in high current transmission. Thanks to the adoption of new technology and processes, the contact resistance and temperature rise at the busbar trunking ends and branching outlets have been significantly reduced. High-quality insulating materials are used within the busbar trunking, enhancing its performance and making the entire system more perfect.
The current-carrying busbars convert the loss due to resistance into heat, causing the busbar temperature to rise. Although copper and aluminum materials can be used at higher temperatures without affecting their mechanical strength, the touching surfaces of the bolts in Ningbo busbars become more prone to oxidation due to the higher temperature, which increases the contact resistance. The increased contact resistance further raises the touching surface temperature, creating a cycle that leads to damage at the contact points. Therefore, the oxidation issue of the electrical contact surfaces becomes a major factor limiting the busbar slot temperature. Silver-plated bolt connections allow for higher busbar temperatures, but at a high cost, so bolts with tin or zinc plating on the connection surfaces are usually used. This type of busbar has a lower allowable temperature. China's regulations set the allowable busbar temperature at 85-90°C, with the allowable temperature for enclosed busbars and casings at 65-70°C. When using welding, the allowable temperature can reach 110°C with an automatic riveting machine for busbar slots. However, during electrical connections, bolt connections are unavoidable for ease of installation and maintenance.
Busbar Channel Manual Inspection Line - Kaide Electric Co., Ltd. - Busbars in Ningbo are supplied by Suzhou Kaide Electric Co., Ltd. Kaide Electric Co., Ltd. adheres to the corporate philosophy of "people-oriented," boasting a highly qualified team. We strive to provide better products and services to benefit society and warmly welcome both new and old customers to visit and do business with us, sincerely cooperate, and create a brighter future together. Kaide Electric — Your Trusted Friend. Company Address: 123 East Suzhou Avenue, Suzhou Industrial Park, Jiangsu Province. Contact Person: Cai Yan.