Siemens Sivacon S8, Планировочная информация, Страница: 63 / 112

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SIVACON S8 Planning Principles – Cubicles in fixed-mounted design
Fig. 6/3: Installation of switching devices in fixed-mounted cubicles with a front cover (cover opened)
Vertical distribution busbar
The vertical distribution busbars with the phase conductors
L1, L2, L3 are arranged at the left in the cubicle. The PE, N
or PEN busbars are arranged in the cable connection com-
partment. In the case of 4-pole feeders, the N conductor is allocated
to the phase conductors L1, L2, L3 at the back of the cubi-
cle. Ratings are stated in Tab. 6/8.
Distribution busbar Profile bar Flat copper
1)
Cross section 400 mm
2
650 mm
2
1 x (40 mm x 10 mm) 2 x (40 mm x 10 mm)
Rated current at 35 °C ambient
temperature
Ventilated 905 A 1,100 A 865 A 1,120 A
Non-
ventilated
830 A 1,000 A 820 A 1,000 A
Rated short-time withstand
current
I
cw
(1 sec)
2)
65 kA 65 kA 65 kA 65 kA
1)
Top main busbar position
2)
Rated conditional short-circuit current I
cc
= 150 kA
Tab. 6/8: Rating data of the vertical distribution busbar
Mounting
One or multiple switching device(s) is/are mounted on
device holders of graduated depth and connected to the
vertical distribution busbars with the incoming feeder side (Fig. 6/3). To the front, the devices are equipped with front
covers. Operation is effected through the cover.
Cable connection
For form 1, 2b and 4a, the cable connection is effected
directly at the switching device. The maximum cross sec-
tions that can be connected are stated in the device cata-
logues. For form 4b, the cable connection is effected in the cable
connection compartment. Tab. 6/9 states the maximum
conductor cross sections and Fig. 6/4 shows a detail with
connections.
Nominal feeder current Max. conductor cross section
≤ 250 A 120 mm
2
> 250 A 240 mm
2
Tab. 6/9: Conductor cross sections in fixed-mounted cubicles with
a front door
Fig. 6/4: Cable connections in fixed-mounted cubicles with a front
cover