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© Siemens AG 2007<br />
BD2 <strong>System</strong> — <strong>160</strong> ... 1250 A<br />
Comparison of busbar trunking and cable installation systems<br />
Feature Busbar trunking installation Cable installation<br />
TTA assembly × –<br />
Mechanical safety High Low<br />
Fire load Low High<br />
Temperature characteristic<br />
<strong>System</strong> structure<br />
Protective devices for loads<br />
Ambient temperature<br />
according to IEC/EN 60439-1 and -2<br />
max. +<strong>40</strong> °C and +35 °C on a 24 hour average<br />
Clear due to linear system structure with in-line load<br />
tap-offs via tap-off units<br />
In the tap-off unit: means direct and immediate<br />
on-the-spot identification of assignment to consumer<br />
Engineering information<br />
According to DIN 57298 Part 4/<br />
VDE 0298 Part 4/2.88 loads are based on +30 °C.<br />
Very large accumulation of cables at feed point due to<br />
point-to-point supply of loads from central power<br />
distribution unit<br />
Centrally in the distribution board: makes the assignment<br />
to the load not directly verifiable. It is necessary<br />
to rely on correct labeling of the cables and loads.<br />
Space requirement Low High as the corresponding distribution board is<br />
required. Routing criteria (cable accumulation, type of<br />
routing, current-carrying capacity, etc.) must be<br />
complied with.<br />
Retrofitting capability if consumer<br />
tap-offs changed<br />
Great flexibility due to tap-off points in the trunking unit<br />
and a great number of different tap-off units<br />
Planning and engineering<br />
Simple and fast with EDP-aided planning tools being<br />
used<br />
Dimensioning (current, voltage drop, Not complex<br />
protective earth conditions)<br />
Only possible at great expense. Laying additional<br />
cables from the central distribution board to the<br />
consumer.<br />
Highly intensive engineering (distribution and cable<br />
layouts, cable plans, etc.)<br />
Very complex<br />
Fault location Low High<br />
Fire barrier Type-tested, ex-works Dependent on the work standard applied on the<br />
building site<br />
Functional endurance<br />
Tested functional endurance according to<br />
DIN 4102-12<br />
Dependent on the work standard applied on the<br />
building site<br />
Electromagnetic interference Low, due to sheet steel and conductor<br />
configuration<br />
Relatively high with a standard cable<br />
Mounting<br />
Very little fitting materials and tools required,<br />
short mounting times<br />
Complex mounting materials and a comprehensive<br />
range of tools required, long mounting times<br />
Weight Up to l of the comparable cable weight Up to 3-times the busbar trunking system weight<br />
Halogen and PVC free Trunking units are always halogen and PVC free Standard cables are not always halogen and PVC free<br />
5<br />
Siemens LV 70 · 2006<br />
5/93
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