IG-183-EN version 06; 31/03/2020
28
Installation
General instructions
cgm
.3 system: medium voltage SF
6
gas-insulated
cubicles up to 38 kV according to IEEE and CSA standards
4.3.2. Cubicles with IAC internal arc up to 25 kA – 1 s
Feeder, busbar raise and cable raise functions
D1
Frontal or rear cables incoming or outgoing
D2
Lateral cables incoming or outgoing
Figure 4.7.
Dimensions [mm] of the cable trench for
cgm
.3-l
,
cgm
.3-rb
and
cgm
.3-rc
Necessary cable trench for feeder, busbar raise and cable raise functions
Cable data
Minimum depth
Cable
insulation
Cable type
Cable section
[mm
2
]
Cable
diameter
[mm]
Indicative
radius of
curvature*
[mm]
D1
[mm]
D2
[mm]
Dry insulation
One-core
18/30 kV
< 150**
41
555
370
500
185
43
590
370
550
240
45.2
640
300
47.5
685
370
660
400
50.5
745
Three-core
18/30 kV
< 150
92.7
805
650
650
* Check with the cable used manufacturer’s data.
** 150 mm
2
cable only valid up to 21 kA.
Table 4.6.
Necessary cable trench for feeder, busbar raise and cable raise functions
