Planning with SIVACON 8 PS - Siemens

Planning principles2.2 Busbar trunking system planningand the LRC cast resin system consist of busbars, fixing and connection accessories and aninsulating foil, along with an aluminium enclosure (LX) or an enclosure made from epoxyresin (LRC).Figure 2-2Trunking unit: power supplied via a busbarPower transmissionComponents of the busbar trunking system transmit power between transformers and lowvoltage power distribution systems and from the main distribution board to the servicedistribution board. Trunking units without tap-off points are used for the power transmission.In addition to thestandard lengths, customers can select lengths from several ranges to meettheir particular building requirements.Power distributionThe main application of busbar trunking systems is power distribution. Current can't be takenfrom just a single point which is permanently installed such as a cable installation. Currenttap-off units can be moved to any position within the entire system. To tap power at anygiven point simply requires positioning a tap-off unit at that location on the busbar.The result is a flexible distribution system for decentralised power supply to a particular lineor area. Tap-off points can be mounted on one or both sides of straight trunking units.Depending on the requirements of the particular application, busbar trunking units with tapoffunits for a rated current of 1250 A from a single tap-off point are available for tapping offpower and connecting loads. The tap-off units can be equipped with fuses, fuse-switches,miniature circuit-breakers or circuit-breakers as desired.On all Siemens busbar trunking systems, the tap-off units can be changed withoutdisconnecting the busbar trunking run. The following requirements apply:Planning with SIVACON 8 PS24 Planning Manual, 10/2007, A5E01541101-01