Performance Characteristics of Siemens Busbar Trunking and Cables
Release time:
2021-01-25
Source:
Siemens busbar trunking systems are enclosed metal assemblies composed of copper or aluminum busbars, designed to distribute high power to individual components in distributed power systems. In indoor low-voltage power distribution trunking projects, they are increasingly replacing traditional wires and cables. Compared with conventional cables, busbar trunking systems demonstrate clear advantages when handling large currents. Moreover, thanks to the adoption of new technologies and manufacturing processes, contact resistance and temperature rise at connection points and tap-off locations have been significantly reduced. The use of high-quality insulating materials within the busbar trunking system further enhances its safety and reliability, thereby improving the overall performance and integrity of the power distribution system.
Siemens busbar trunking system It is a closed metal enclosure composed of copper and aluminum busbars, designed to distribute high power to individual components in a distributed system. In indoor low-voltage power distribution trunking projects, it is increasingly replacing traditional wires and cables. Compared with conventional cables, it demonstrates clear advantages when handling large currents. Moreover, thanks to the adoption of new technologies and processes, the contact resistance and temperature rise at the connection points at both ends of the busbar trunking as well as at the tap-off points have been significantly reduced. The use of high-quality insulating materials within the busbar trunking further enhances its safety and reliability, thereby making the entire system more robust and comprehensive.
Performance Characteristics of Standard Siemens Busway and Cables
a) Current-carrying capacity
Low-voltage cables have a maximum cross-sectional area of 1,000 mm² and a rated current of 1,600 A. Due to their large size and weight, cables of this specification are rarely used in practical engineering applications. In practice, cables with a cross-sectional area of 400 mm² or less are typically employed, which necessitates the use of multiple cables to provide simultaneous power supply. By contrast, busway systems can achieve a maximum rated current of 6,300 A, a substantial current-carrying capacity that cables simply cannot match.
b) Overload Capacity
Whether it is a cable or a Siemens busbar trunking system, its overload capacity depends on the operating temperature of the insulation material used. The insulation material for busbar trunking systems is rated for an operating temperature of 105°C; meanwhile, irradiation-crosslinked, flame-retardant wrapping tapes (PER) and radiation-crosslinked polyolefin heat-shrink tubing with operating temperatures exceeding 140°C have been developed. By contrast, the typical long-term operating temperatures for cable insulation materials are generally 90°C and 105°C, with irradiation-crosslinked cables having a maximum operating temperature of 125°C. Consequently, the overload capacity of busbar trunking systems is significantly greater than that of cables.
c) Install the tap
Siemens busbar trunking system The plug-in tap-off method is generally used for installation. In this approach, the main feeder power is tapped off to the branch circuits via a plug-in connection, with a tap-off box provided at regular intervals of several meters, making tap-offs highly convenient. By contrast, cable-based tap-offs must be performed on-site, which results in lower reliability; even prefabricated branch cables have their own limitations. A significant drawback of branch cables is that they require custom-made branch connection fittings from the manufacturer, typically using open C-shaped clamps.
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