Siemens Sivacon S8 Planning Information page 57

Configuration rules
For the completely equipped cubicle, the RDF in accordance
with IEC 61439-2 applies. Non-observance of these notes
might result in premature ageing of fuses and their uncon-
trolled tripping due to local overheating. The permissible
operating current of all in-line units in the cubicle is limited
by the rated current of the vertical distribution busbar.
Tab. 5/12: Conversion factors for different ambient temperatures
Ambient temperature of the
switchgear
Conversion factor
Tab. 5/13: Configuration rules for SASIL plus: arrangement of the in-line units in the cubicle
Size Grouping
Summation current of
00
the group ≤ 319 A
Summation current of
1
the group ≤ 365 A
2 Not permissible
3 Not permissible
1)
Below the bottommost in-line unit, only 75 mm blanking cover instead of 150 mm blanking cover or no blanking cover instead of 75 mm blanking cover required
54 SIVACON S8 Planning Principles – In-line design, plug-in
20 °C 25 °C 30 °C
1.10 1.07 1.04
Blanking covers 75 mm
with vent slots
One blanking cover each above
1)
and below the group
One blanking cover each above
1)
and below the group
One blanking cover each above
1)
and below the group
Two blanking covers each
1)
above and below the group
All data refer to an ambient temperature of the switchgear
of 35 °C on 24 h average. Conversion factors for different
ambient temperatures are stated in Tab. 5/12.
Rating data and arrangement notes for the configuration of
in-line units and covers are given in Tab. 5/13. The in-line
switch-disconnectors are arranged in the cubicle either in
groups or individually in decreasing order from size 3 to
size 00. Blanking covers with vent slots are mounted in
between for ventilation.
35 °C
40 °C
1.00 0.96
Example
In-line unit
In-line unit size 00
In-line unit size 00
In-line unit size 00
In-line unit
In-line unit
In-line unit size 1
In-line unit size 1
In-line unit
In-line unit
In-line unit size 2
In-line unit
In-line unit
In-line unit size 3
In-line unit
45 °C 50 °C 55 °C
0.93 0.89 0.85
Nominal
current Operating
fuse: current:
80 A 60 A
100 A 76 A
160 A 122 A
Total: 256 A
Nominal
current Operating
fuse: current:
250 A 182 A
250 A 182 A
Total: 364 A
Nominal
current Operating
fuse: current:
355 A 288 A
Nominal
current Operating
fuse: current:
630 A 510 A