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New busbar trunking system for high currents up to 6,300 ampere


Light+Building, Halle 11, Stand B56

The Sivacon 8PS LI system, which will replace the existing LX system, is a busbar trunking system developed by Siemens for high currents up to 6,300 amperes. The new system meets the most important European safety standards and supports energy management by integrating communications-capable measuring and protection devices in the tap-off units.

Flexible use of tap-off units allows outgoing current feeders to be varied as desired with the new LI busbar trunking system from the Sivacon 8PS product portfolio.

Thanks to a compact design, it can also be flexibly installed in small spaces. The hook and bold connection guarantee low-loss busbar junctions with high contact quality for efficient power transmission. Busbar trunking systems are used in place of cables for safe and flexible power distribution in buildings and industrial plants. The LI system will be presented for the first time at Light+Building, which will take place from March 30 to April 4, 2014 in Frankfurt.

The new busbar trunking system is particularly suitable for transmitting power in the range of 800 A to 6,300 A over long distances and in small spaces. Thanks to a compact sandwich design, high currents can be transmitted in horizontal and vertical irrespective of the mounting position with a low voltage drop. The system was designed specifically for use in multistory buildings and computer centers as well as industrial plants.

While electricity can be tapped only at fixed points in conventional cable installations, the LI system allows outgoing current feeders to be varied as desired between 50 A and 1,250 A via flexible tap-off units – even while energized, according to DIN EN 50110-1, depending on the national standards. Communications-capable measuring and switching devices can be installed in the tap-off units and integrated into energy management systems according to ISO 50001.

The LI system has been design verified according to IEC 61439-1/-6 and thus meets the high safety requirements. High short-circuit rating, degree of protection IP55 and a low fire load, thanks to the aluminum housing, reliably protect people, equipment and buildings.

The fire barrier of the LI system was tested for fire resistance classes EI90 and EI120 (EN 13501 category) according to EN1366-3 and thus meets building regulations according to European standards. The design verified connections to the Sivacon S8 low-voltage switchboard ensure high reliability and optimum plant protection. The system works reliably even when operated under full load at an ambient temperature of 40 °C.

The busbar elements are assembled with hook-and-bolt connection, which guarantees high connection quality and low contact resistance. These connection technology give the LI system improved rigidity with high fixing distances. Different feeding elements, trunking units, elbow and knee elements as well as various tap-off units allow the LI system to be reliably planned and assembled to fit any building structure.

Siemens at light+building:

For further information on busbar trunking systems, please see

The Siemens Infrastructure & Cities Sector (Munich, Germany), with approximately 90,000 employees, focuses on sustainable and intelligent infrastructure technologies. Its offering includes products, systems and solutions for intelligent traffic management, rail-bound transportation, smart grids, power distribution, energy efficient buildings, and safety and security. The Sector comprises the divisions Building Technologies, Low and Medium Voltage, Mobility and Logistics, Rail Systems and Smart Grid. For more information visit

The Siemens Low and Medium Voltage Division (Erlangen, Germany) serves the entire product, system, and solutions business for reliable power distribution and supply at the low- and medium-voltage levels. The Division's portfolio includes switchgear and busbar trunking systems, power supply solutions, distribution boards, protection, switching, measuring and monitoring devices as well as energy storage systems for the integration of renewable energy into the grid. The systems are supplemented by communications-enabled software tools that can link power distribution systems to building or industry automation systems. Low and Medium Voltage ensures the efficient supply of power for power grids, infrastructure, buildings, and industry. Additional information is available at:

Reference Number: ICLMV20140301e


Mr. Heiko Jahr
Low and Medium Voltage Division

Siemens AG

Freyeslebenstr. 1

91058  Erlangen


Tel: +49 (9131) 7-29575

Heiko Jahr | Siemens Infrastructure & Cities Sector

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