With the advent of modern engineering facilities and equipment, electricity consumption across all industries has increased rapidly, particularly with the proliferation of high-rise buildings and large-scale factories. Traditional cables, as conductive elements, can no longer meet the demands of high-current transmission systems. Moreover, using multiple cables in parallel creates significant logistical challenges for on-site installation and connection. In contrast, plug-in busbars, as a new type of power distribution wiring, have fully demonstrated their superior performance in high-current transmission. At the same time, thanks to the adoption of new technologies and processes, Busbar trunking The number of connections at both ends is significantly reduced. The contact resistance and temperature rise at branch nodes are minimized, and the busbar trunking system uses high-quality insulating materials, thereby enhancing its safety and reliability and making the entire system more robust. Now, let’s explore how to select the right busbar trunking product!

　　1. Selection of qualified products from reputable enterprises:

　　Busbar trunking systems must bear the mandatory 3C certification mark and come with a corresponding type-test report. In China, the quality of busbar trunking manufacturers varies widely, with most production still carried out manually, primarily in moderately developed regions. When making a purchase, it is essential to conduct a thorough investigation into the manufacturer’s production scale, technical capabilities, workforce qualifications, and production environment—especially the latter. This is because if insulation is performed in an unclean environment, conductive particles can become embedded within the insulating layer. While this may not be noticeable during initial operation, over time the insulation will degrade.

　　2. Note Busbar trunking Conductor material:

　　Currently, the main options are copper busbars, aluminum busbars, and copper–aluminum composite materials, with significant price differences among them. In addition to purity, it is also important to consider the mechanical properties of the material after bending. Here, we will focus on copper–aluminum composite materials. The strength of the copper–aluminum interface directly affects processing performance and reliability, making it a critical performance parameter for copper–aluminum composite busbars. A 90° bend test should show no foaming and no obvious orange-peel effect, with no delamination between copper and aluminum. Such materials can be used in electrical equipment that has relatively low requirements for interfacial bond strength. Different manufacturing processes result in different levels of interfacial bond strength. When copper and aluminum are joined using mechanical pressure, only the interface atoms are activated, leading to the formation of atomic bonds. After heat treatment and diffusion, point bonding transforms into area bonding; however, the diffusion depth remains limited, resulting in relatively low interfacial bond strength. By employing specific process conditions to achieve metallurgical bonding between copper and aluminum, it is possible to form a composite layer with uniform interfacial bonding and consistent thickness, thereby attaining significantly higher interfacial bond strength.

　　3. Busbar Trunking Cross-Section Selection:

　　Typically, the busbar cross-section should be selected based on the larger of the long-term operating current and the short-time thermal and dynamic stability requirements, which are determined by the largest short-circuit current through the busbar. When multiple conductors are closely spaced, resistive heating and skin-effect considerations cause the busbar groove to heat up during current flow. For bare copper or aluminum busbars, the permissible continuous operating temperature is 70°C; however, if the contact surfaces are reliably tin-plated—such as by ultrasonic tinning—the allowable temperature can be increased to 85°C for continuous operation. Due to these temperature limits, busbars made from different materials and with different cross-sectional areas are assigned appropriate long-term allowable current ratings. When selecting the busbar cross-section, the actual long-term operating current in the busbar groove must be kept below the long-term allowable current rating for the selected cross-section. If the annual average load is high and the busbar run is long—for example, in outdoor switchgear installations—the busbar cross-section is generally chosen using the economic current density method. The economic current density is defined as the current per unit cross-sectional area of the busbar that results in lower total losses in the busbar and associated equipment, as well as lower annual maintenance and depreciation costs. Dividing the economic current density by the long-term operating current (excluding overload conditions) yields the required busbar cross-section. Busbar cross-sections selected by the economic current density method are typically larger than those selected based solely on the long-term operating current.

　　4. Busbar trunking Fuel tank maximum temperature increase:

　　What is the maximum temperature rise of a busbar trunking system? The maximum temperature rise of a busbar trunking system refers to the temperature increase—defined as the difference between the highest operating temperature of the busbar trunking under full-load conditions at its rated current and the ambient temperature. This is typically expressed in kelvins (K). During the design phase, busbar trunking systems undergo temperature-rise limit tests. Temperature rise directly limits the current-carrying capacity of the busbar trunking; as temperature increases, the service life of the busbar trunking shortens, power losses rise, and voltage drops occur. Moreover, elevated temperatures can raise the surrounding ambient temperature, accelerating the aging of insulating materials in adjacent equipment and potentially leading to safety hazards.

　　5. Select busbar trunking based on current rating:

　　Selecting the appropriate bus product based on the design process can prevent waste and reduce costs.

　　6. Select the busbar trunking system based on the operating environment and installation method:

　　When selecting busbar trunking systems, the operating environment must be taken into account. The protection rating of the busbar trunking shall meet the following requirements: 1. For dedicated clean indoor locations, IP30 or higher is required. 2. For general indoor locations, IP40 or higher is required. 3. For indoor locations with splash-proof requirements, IP54 or higher is recommended. 4. For damp indoor environments or locations with waterproofing requirements, IP65 or higher is required. 5. For corrosive environments or outdoor applications, a fully sealed, resin-encapsulated busbar trunking system with an IP68 rating is required.

　　Depending on the installation method, careful consideration must also be given to the selection of busbar trunking. If the busbar trunking is installed horizontally and supports can be provided as required, a busbar trunking with a length of approximately 3 meters must be used. When the support spacing exceeds 6 meters, a longer busbar trunking must be employed. For planar installations along flat surfaces in buildings of various shapes, rectangular busbar trunking shall be used. For installations along curved surfaces, it is recommended to use resin-impregnated busbar trunking or cylindrical busbar trunking. When busbars are installed vertically, tightly insulated or resin-impregnated busbars should be used, with insulation materials having a long-term operating temperature of at least 130°C. To prevent the chimney effect, when selecting air-insulated busbar trunking, fire barriers must be installed between individual compartments within the busbar trunking enclosure.

　　When used for emergency power supplies, fire-resistant and waterproof busbar trunking systems shall be employed.

　　7. Pay attention to the busbar trunking installation supports:

　　 Busbar trunking Compared with cable systems, busbar trunking systems offer a longer service life, typically lasting 30 to 50 years. To maximize the service life of the busbar trunking system, proper consideration must also be given to the supports along the busbar run. When the busbar trunking is installed horizontally, lift-type or gantry-type supports are commonly used; for vertical runs, spring-supported and angle-iron supports are typically employed. When purchasing high-capacity busbar trunking systems, it is essential to carefully inspect the materials of the support arms and main beams, as well as the springs and load-bearing capacity. Some unscrupulous manufacturers may use lower-grade angle iron as support material, which can lead to sagging and movement of the busbar trunking over time. If such issues are not addressed promptly, they could result in safety accidents.

　　The above is an overview of how to select the right busbar trunking system. For more information, please feel free to contact us at any time!