BD01 System – 40 ... 160 A - GRUP DAP

© Siemens AG 2007
BD2 System — 160 ... 1250 A
Engineering information
Functional endurance
Fire protection equipment and fire protection precautions for
electrical installations are required especially with building
structures of a particular type of utilization. Buildings of this
nature include hospitals and places where people gather. The
German standards DIN VDE 0108-1 "Buildings where people
meet" and DIN VDE 0100-710 "Medically used areas" state that
electrical systems must remain operational for certain periods of
time in the event of a fire. This applies in particular to
• Fire alarm systems
• Systems for sounding alarms and conveying instructions to
visitors and employees
• Emergency lighting
• Passenger elevators with evacuation circuit which must
remain serviceable in the incoming feeder area for at least
30 minutes under post-flashover fire conditions
• Water pressure boosting equipment for firefighting water
supply
• Ventilation systems of enclosed stairwells, elevator shafts and
drive equipment rooms for fire service elevators must remain
operational for at least 90 minutes.
1000
°C
Magnetic fields
General information
The busbars intended for power distribution generate – as do all
other conductors – alternating electromagnetic fields with a
base frequency of 50 Hz. These magnetic fields can negatively
influence the function of sensitive equipment such as computers
or measurement instruments.
Limit values
The EMC guidelines and the standards derived from these do
not contain any regulations or recommendations for engineering
busbar trunking system installations. If busbar trunking systems
are used in medical facilities, the DIN VDE 0100-710 standard
can be consulted.
In DIN VDE 0100-710, recommended values of mains frequency
induced magnetic fields in facilities used for medical purposes
are defined. Stations where patients are treated may not be subject
to magnetic induction at 50 Hz which exceeds the following
values:
• B = 2 × 10 -7 Tesla for EEG
• B = 4 × 10 -7 Tesla for ECG
In order to make it possible to decide in the planning stage
which busbars should be used, Siemens has carried out extensive
magnetic field measurements. The magnetic radiated noise
of the busbar systems was measured using a 9.6 m long straight
busbar arrangement. The busbars were loaded symmetrically
with the rated current and the magnetic fields measured in their
horizontal and vertical axes.
500
Z
0
0
30 60 90 120 150 (min) 180
NSV0_01072
NSV0_01046
X
Standard temperature curve (ETK) for assessing functional endurance
In order to provide the functional endurance of the busbar trunking
system stipulated by the regulations, Siemens successfully carried
out and completed tests in cooperation with Promat for
BD2A/BD2C busbar trunking system at the materials testing
laboratory in Braunschweig in Germany.
During the fire tests, the busbar trunking systems were equipped
with a cladding of Promatect L500 plates of various thicknesses
(thickness d = 20 mm, 40 mm, 60 mm) and were subjected to a fire
load of of external origin as defined by the "standard temperature
curve (ETK)" in order to assess the functional endurance according
to DIN 4102 Part 12.
More information on request.
System of coordinates for magnetic field measurement
The threshold value for inductive interference between multicore
cables and wires of the high-current system, conductor
cross-section > 185 mm 2 , and the stations where patients are
treated will certainly not be exceeded when a minimum distance
of 9 m as recommended by the DIN VDE 0100-710 standard is
observed.
When busbars are used this distance will usually turn out to be
less since the sheet steel is effective in reducing magnetic interference
fields in the environment.
Measured values on request.
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