IG-183-EN version 06; 31/03/2020
44
Recommended sequence of operations
General instructions
cgm.3 system: medium voltage SF
6
gas-insulated
cubicles up to 38 kV according to IEEE and CSA standards
5.3.4. Grounding operation from the open position
1. Move the actuation shaft access handle in the yellow
zone to its lower position.
2. Insert the lever in the grounding switch actuation shaft
and turn clockwise.
3. Remove the lever, the handle returns to its original
position.
4. Verify that the cubicle is in grounding position.
Figure 5.7. Grounding from open position cgm.3-l
5.3.5. Cable test
To test the cables in cgm.3-l feeder cubicles, B/BM driving
mechanisms with this feature must be ordered.
These driving mechanisms allow the operation of going
from grounding switch closed to switch-disconnector
open, even when the cable compartment cover is open.
Thus, the switch-disconnector cannot be changed to the
closed position until this cover has been put back.
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