Siemens Sivacon S8 Planning Information page 55

Configuration rules
For the completely equipped cubicle, the rated diversity
factor (RDF) in accordance with IEC 61439-2 applies.
Non-observance of these notes might result in premature
ageing of fuses and their uncontrolled 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.
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. 5/6.
Tab. 5/6: Conversion factors for different ambient temperatures
Ambient temperature of the
switchgear
Conversion factor
Tab. 5/7: Configuration rules for 3NJ62: arrangement of the in-line units in the cubicle
Size Grouping
00 Summation current of
1 the group ≤ 400 A
2
Not permissible
Not permissible
Operating current < 440 A
3
Not permissible
Operating current
from 440 A to 500 A
1)
Below the bottommost in-line unit, only 50 mm blanking cover instead of 100 mm blanking cover or no blanking cover instead of 50 mm blanking cover required
52 SIVACON S8 Planning Principles – In-line design, plug-in
20 °C 25 °C 30 °C
1.10 1.07 1.04
Blanking covers
with vent slots
100 mm blanking cover
1)
below the group
50 mm blanking cover below
the in-line unit
50 mm blanking cover above
and
100 mm blanking cover
1)
below the in-line unit
100 mm blanking cover each
1)
above and below the in-line
unit
Rating data and arrangement notes for the configuration of
in-line units and covers are given in Tab. 5/7. 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 0.95
Example
In-line unit
In-line unit size 00 / 1
In-line unit size 00 / 1
In-line unit size 00 / 1
In-line unit
In-line unit
1)
In-line unit size 2
In-line unit
In-line unit
In-line unit size 3
In-line unit
In-line unit
In-line unit size 3
In-line unit
45 °C 50 °C 55 °C
0.90 0.85 0.80
Nominal
current Operating
fuse: current:
80 A 64 A
125 A 100 A
250 A 200 A
Total: 364 A
Nominal
current Operating
fuse: current:
400 A 320 A
Nominal
current Operating
fuse: current:
500 A 400 A
Nominal
current Operating
fuse: current:
630 A 500 A